CN102025796A - MAC (media access control) address updating method and device - Google Patents

Abstract

The invention discloses a method for updating a MAC address, which is used for realizing the unified update and maintenance of the MAC address. The method includes: obtaining the multicast group IP address of the Internet Protocol version 4 IPv4 version or the multicast group IP address of the Internet Protocol version 6 IPv6 version according to the received message; when obtaining the multicast group IP address of the IPv4 version, will obtain The multicast group IP address of the IPv4 version is mapped to the multicast media access control MAC address; when the multicast group IP address of the IPv6 version is obtained, the multicast group IP address of the obtained IPv6 version is mapped to the multicast MAC address; Update the public MAC address table according to the obtained multicast MAC address. The invention also discloses a device for realizing the method.

Description

Method and device for updating MAC address

technical field

The invention relates to the communication field, in particular to a method and device for updating a MAC address.

Background technique

Due to the problem of insufficient address space in the current IPv4 (Internet Protocol version 4, Internet Protocol version 4) network, the next-generation Internet protocol with IPv6 (Internet Protocol version 6, Internet Protocol version 6) as the core has moved from the research stage to practical use. . Compared with the 32-bit address length of IPv4, the 128-bit address length of IPv6 can not only meet the needs of global users for IP addresses, but also provide better support in aspects such as security, mobility, and service quality. Therefore, IPv6 replaces IPv4 has become an inevitable trend of network development. However, since the current Internet is still in the initial stage of IPv6 development, and the existing IPv4 network has a considerable scale, in order to protect existing equipment and investment, the network cannot be replaced to IPv6 at one time, but will face a long-term coexistence of IPv4 and IPv6 the process of. At present, a smooth transition can only be achieved if the integration of IPV4 and IPV6 networks is done well.

The basic principle of multicast technology is to use IGMP (Internet Group Management Protocol, Internet Multicast Management Protocol) or MLD (Multicast Listener Discovery, Multicast Listener Discovery) to maintain multicast group relationships. IGMP (IPv4) or MLD (in IPv6) runs on Layer 3 devices, dynamically manages multicast receivers joining or leaving a multicast group, and establishes Layer 3 multicast forwarding entries. At the same time, IGMP Snooping (Internet Group Management Protocol Snooping, Internet Multicast Management Protocol Snooping) or MLD Snooping (Multicast Listener Discovery Snooping, Multicast Listener Discovery Snooping, Multicast Listener Discovery Snooping) is run on the second-layer device, and the third-layer of IGMP protocol or MLD protocol is configured respectively. According to the IGMP message or MLD message between the device and the multicast receiver, the MAC multicast address table is established and maintained on the Layer 2 device. Afterwards, the multicast data packets received by the Layer 2 device are forwarded according to the MAC multicast address table, so as to implement the Layer 2 multicast of the multicast data packets.

In the prior art, on a dual protocol stack layer 2 device supporting both IPv4 and IPv6, the IPV4 protocol stack and the IPv6 protocol stack may maintain their own MAC multicast address tables independently, which will not only cause waste of hardware resources, but also cause a waste of software resources. The implementation will also increase the complexity, and it is not convenient to perform security management on the MAC address.

Contents of the invention

The embodiment of the present invention provides a MAC address update method for realizing unified update and maintenance of MAC addresses, and a multicast method for realizing multicast of data according to a unified MAC address.

A method for updating a MAC address, comprising the steps of:

Obtain the multicast group IP address of the Internet Protocol version 4 IPv4 version or the multicast group IP address of the Internet Protocol version 6 IPv6 version according to the received message;

When the multicast group IP address of the IPv4 version is obtained, the multicast group IP address of the obtained IPv4 version is mapped to the multicast media access control MAC address; when the multicast group IP address of the IPv6 version is obtained, the obtained IPv6 Version multicast group IP addresses are mapped to multicast MAC addresses;

Update the public MAC address table according to the obtained multicast MAC address.

A multicast method, comprising the following steps:

Obtain the multicast group IP address of the IPv4 version or the multicast group IP address of the IPv6 version according to the received message;

When the multicast group IP address of the IPv4 version is obtained, the multicast group IP address of the obtained IPv4 version is mapped to the multicast media access control MAC address; when the multicast group IP address of the IPv6 version is obtained, the obtained IPv6 Version multicast group IP addresses are mapped to multicast MAC addresses;

Querying the port number corresponding to the multicast MAC address in a public MAC address table according to the multicast MAC address, and forwarding data according to the port number.

A device for updating a MAC address, comprising:

The processing module is used to obtain the multicast group IP address of the IPv4 version or the multicast group IP address of the IPv6 version according to the received message;

Conversion module, for when obtaining the multicast group IP address of IPv4 version, the multicast group IP address of obtained IPv4 version is mapped to the multicast media access control MAC address; When obtaining the multicast group IP address of IPv6 version , mapping the obtained IPv6 version multicast group IP address to a multicast MAC address;

The execution module is used for updating the public MAC address table according to the obtained multicast MAC address.

A multicast device, comprising:

The processing module is used to obtain the multicast group IP address of the IPv4 version or the multicast group IP address of the IPv6 version according to the received message;

Conversion module, for when obtaining the multicast group IP address of IPv4 version, the multicast group IP address of obtained IPv4 version is mapped to the multicast media access control MAC address; When obtaining the multicast group IP address of IPv6 version , mapping the obtained IPv6 version multicast group IP address to a multicast MAC address;

An execution module, configured to query a public MAC address table for a port number corresponding to the multicast MAC address according to the multicast MAC address, and perform data forwarding according to the port number.

The embodiment of the present invention obtains the multicast group IP address of the Internet Protocol version 4 IPv4 version or the multicast group IP address of the Internet Protocol version 6 IPv6 version according to the received message; when obtaining the multicast group IP address of the IPv4 version, the obtained The multicast group IP address of the IPv4 version is mapped to the multicast media access control MAC address; when the multicast group IP address of the IPv6 version is obtained, the multicast group IP address of the obtained IPv6 version is mapped to the multicast MAC address; according to The obtained multicast MAC address updates the public MAC address table. IPv4 and IPv6 use the same public MAC address table, which realizes unified update and maintenance of MAC addresses and saves memory resources.

Description of drawings

FIG. 1 is a main structural diagram of a MAC address updating device in an embodiment of the present invention;

FIG. 2 is a detailed structural diagram of a MAC address updating device in an embodiment of the present invention;

FIG. 3A is a detailed structural diagram of a processing module in a device for updating a MAC address in an embodiment of the present invention;

FIG. 3B is a detailed structural diagram of an execution module in a device for updating a MAC address in an embodiment of the present invention;

Fig. 4 is the main flowchart of the MAC address updating method in the embodiment of the present invention;

When the adding message that Fig. 5 receives in the embodiment of the present invention is IPv4 version, obtain the detailed flowchart of IGMP Snooping entry;

Fig. 6 is that the adding message that receives in the embodiment of the present invention is IPv6 version, obtains the detailed flowchart of MAC address;

Fig. 7 is the detailed flowchart of the processing of IGMP Snooping entry when the leave message received in the embodiment of the present invention is IPv4 version;

FIG. 8 is a detailed flow chart of processing the MLDSnooping entry when the received leaving message is in IPv6 version in the embodiment of the present invention.

Detailed ways

The embodiment of the present invention obtains the multicast group IP address of the Internet Protocol version 4 IPv4 version or the multicast group IP address of the Internet Protocol version 6 IPv6 version according to the received message; when obtaining the multicast group IP address of the IPv4 version, the obtained The multicast group IP address of the IPv4 version is mapped to the multicast media access control MAC address; when the multicast group IP address of the IPv6 version is obtained, the multicast group IP address of the obtained IPv6 version is mapped to the multicast MAC address; according to The obtained multicast MAC address updates the public MAC address table. IPv4 and IPv6 use the same public MAC address table, which realizes unified update and maintenance of MAC addresses and saves memory resources.

Referring to FIG. 1 , the device for updating a MAC address in the embodiment of the present invention includes a processing module 101 , an execution module 102 and a conversion module 103 .

The processing module 101 is configured to obtain the multicast group IP address of the IPv4 version or the multicast group IP address of the IPv6 version according to the received message. The multicast group IP address is the multicast group IP (Internet Protocol, Internet Protocol) address, which refers to the multicast group IP address. The processing module 101 receives a message, where the message may be a join message or a leave message, and the message is sent by an IPv4 multicast receiver or an IPv6 multicast receiver. A join message is sent when an IPv4 multicast receiver or a request to join a multicast group is sent, and a leave message is sent when an IPv4 multicast receiver or an IPv6 multicast receiver requests to leave a multicast group. The processing module 101 also receives data packets, which are sent by the IPv4 multicast sender or the IPv6 multicast sender, and are used to send data to the IPv4 multicast receiver or the IPv6 multicast receiver. After receiving the joining message or leaving the message, the processing module 101 parses the message to obtain parameter information in the message, wherein the parameter information includes at least an IPv4 multicast group IP address or an IPv6 multicast group IP address and a VLAN (Virtual Local AreaNetwork, virtual local area network) ID (identifier), and can obtain the port number of the port that receives said joining message or leaving message according to the port that receives said joining message or leaving message. VLAN ID is the ID of the VLAN where the port number is located. There may be multiple VLANs on the Layer 2 device, which can be distinguished by VLAN ID. After the message is parsed, the processing module 101 searches for a first set of entries in IGMP Snooping or a set of second entries in MLD Snooping according to the multicast group IP address resolved in the message. The first set of entries corresponds to IPv4 , the second entry set corresponds to IPv6. Preferably, in the embodiment of the present invention, the first entry may be an IGMP Snooping entry, and the second entry may be an MLD Snooping entry. Each IGMP Snooping entry includes the multicast group IP address, VLAN ID, and port number of the port that received the message from the message, and the corresponding relationship between the three. Each MLD Snooping entry includes the message The multicast group IP address, VLAN ID and the port number of the port receiving the message, and the corresponding relationship among the three are parsed out. All the first entries corresponding to a multicast group IP address form the first entry set, or IGMP Snooping entry set, and all the second entries corresponding to a multicast group IP address form the second entry set , or MLD Snooping entry set. Each IGMP Snooping entry in an IGMPSnooping entry set, or each MLD Snooping entry in an MLDSnooping entry set can have a corresponding link relationship. When querying based on a multicast group IP address, you can query the The IGMP Snooping entry set or MLDSnooping entry set of the multicast group IP address includes all IGMPSnooping entries or MLDSnooping entries containing the multicast group IP address. If the IGMPSnooping entry set corresponding to the multicast group IP address or the MLD Snooping entry set is empty, then the processing module 101 creates an IGMP Snooping entry or MLD Snooping entry according to the multicast group IP address, if corresponding to the If there is no IGMP Snooping entry corresponding to the port number of the port receiving the message in the IGMP Snooping entry set of the multicast group IP address, then the processing module 101 will Create an IGMPSnooping table entry in the IGMP Snooping table entry set with the port number, if there is no MLD Snooping table corresponding to the port number of the port receiving the message in the MLD Snooping table entry set corresponding to the IP address of the multicast group item, then the processing module 101 creates an MLD Snooping entry in the MLD Snooping entry set according to the multicast group IP address and the port number of the port receiving the message. Wherein, the processing module 101 maintains all IGMP Snooping entry sets in IGMP Snooping and all MLD Snooping entry sets in MLD Snooping.

The execution module 102 is configured to update the public MAC address table according to the obtained multicast MAC address. The execution module 102 uniformly stores the multicast MAC address obtained by mapping the multicast group IP address in the IGMP Snooping entry and the multicast MAC address obtained by mapping the multicast group IP address in the MLD Snooping entry in a public MAC address table , and establish a MAC forwarding entry in the public MAC address table according to each MAC address, each multicast MAC address can correspond to multiple MAC forwarding entries, and all MAC forwarding entries corresponding to a multicast MAC address can form a multicast MAC A collection of forwarded entries. Each MAC forwarding entry includes a MAC address and a port number. The port number is the port number of the port that receives packets sent by the IPv4 multicast receiver or packets sent by the IPv6 multicast receiver. The port number is added to the MAC forwarding entry according to the VLAN ID and port number in the IGMP Snooping entry or MLD Snooping entry, and the IPv4 multicast reception can be known according to the multicast MAC address and port number in the MAC forwarding entry or the exact location of the IPv6 multicast receiver. Afterwards, if the processing module 101 receives the data message and resolves the multicast group IP address contained in the data message, the execution module 102 maps the multicast group IP address to a multicast MAC address, and according to the MAC address obtained by mapping The address queries the corresponding multicast MAC forwarding entry set in the public MAC address table to forward data. The corresponding multicast MAC forwarding entry set refers to the MAC address contained in the MAC forwarding entry and the MAC obtained by the mapping. The address is the same.

Conversion module 103 is used for when obtaining the multicast group IP address of IPv4 version, the multicast group IP address of obtained IPv4 version is mapped to the multicast media access control MAC address; When obtaining the multicast group IP address of IPv6 version , and map the obtained IPv6 version multicast group IP address to a multicast MAC address. The IP address in the embodiment of the present invention is an example of a multicast group IP address. The conversion module 103 obtains the IGMP Snooping entry or the MLD Snooping entry in the processing module 101, and the IGMP Snooping entry or the MLD Snooping entry includes the multicast group IP address, VLAN ID and port number. Conversion module 103 converts the multicast group IP address in the IGMP Snooping entry or the MLD Snooping table The multicast group IP address in the item is mapped to the multicast MAC address. Wherein, the mapping relationship can be a function, which determines a fixed calculation method, and the conversion module 103 can obtain the multicast MAC address by substituting the IP address of the IPv4 version into the fixed mapping relationship between the IP address of the IPv4 version and the MAC address , or substitute the IPv6 version IP address into the fixed mapping relationship between the IPv6 version IP address and the MAC address to obtain the multicast MAC address. The VLAN ID included in the IGMP Snooping table item or the MLD Snooping table item can be stored in the execution module 102, and the port number included in the VLAN ID and the IGMP Snooping table item or the MLD Snooping table item can be determined to receive the IPv4 multicast receiver The port number of the port where the packet was sent or the packet was sent by the IPv6 multicast receiver, so the VLAN ID is not included in the MAC forwarding entry. For example, a MAC forwarding entry is:

(0100.5e01.0101, port 1)

Wherein, 0100.5e01.0101 is a MAC address obtained by mapping the multicast group IP address 224.1.1.1. For example, another MAC forwarding entry is:

(3333.0000.0001, port 2)

Wherein, 3333.0000.0001 is the multicast MAC address obtained after mapping the multicast group IP address ff4e::1. Because the IP addresses corresponding to IPv4 all start with 01005e after mapping, and the IP addresses corresponding to IPv6 all start with 3333 after mapping, so the MAC addresses obtained after mapping the IP addresses corresponding to IPv4 and the IP addresses corresponding to IPv6 are different. will be the same, then there will be no conflict when the two are stored in the address table unit 1022.

Referring to FIG. 2 , the device further includes a transceiver module 104 , and the device may also include a storage module 105 .

The transceiver module 104 is used for receiving packets, and sending and receiving IGMP Snooping entries or MLD Snooping entries. The transceiver module 104 is configured to receive a join message or a leave message sent by an IPv4 multicast receiver or an IPv6 multicast receiver. After receiving the message, the transceiver module 104 judges the protocol type of the received message, whether it is the IPv4 protocol or the IPv6 protocol, and then notifies the corresponding unit in the processing module 101 to analyze according to the protocol type. The transceiver module 104 is configured to receive an IGMP Snooping entry or an MLD Snooping entry. The transceiver module 104 is also used to query the existing MAC forwarding entries according to the multicast MAC address mapped from the multicast group IP address in the data message, and find out the set of multicast MAC forwarding entries corresponding to the multicast MAC address. The port number in the multicast MAC forwarding entry set forwards the data sent by the IPv4 multicast sender to the IPv4 multicast receiver, or forwards the data sent by the IPv6 multicast sender to the IPv6 multicast receiver.

The storage module 105 is used to store the mapping relationship. The storage module 105 is used for storing the fixed mapping relationship between the IPv4 version IP address and the MAC address and the fixed mapping relationship between the IPv6 version IP address and the MAC address, and these two mapping relationships can be stored separately. Execution module 102 can according to the IP address of the IPv4 version stored in the storage module 105 or the fixed mapping relationship between the IP address of IPv6 version and the MAC address, the multicast group IP address in the IGMP Snooping entry or the group in the MLDSnooping entry The multicast IP address is mapped to the multicast MAC address.

Referring to FIG. 3A , the processing module 101 specifically includes a first analysis unit 1011 , a second analysis unit 1012 , a first query unit 1013 , a second query unit 1014 , a first creation unit 1015 and a second creation unit 1016 . Among them, the first parsing unit 1011, the first query unit 1013, and the first creation unit 1015 are devices corresponding to IPv4, while the second parsing unit 1012, the second query unit 1014, and the second creation unit 1016 are devices corresponding to IPv6. equipment. In the embodiment of the present invention, in the processing module 101, all the examples of adding messages to IPv4 take the message that the IPv4 multicast receiver sends to join the multicast group 224.1.1.1 as an example; Take the broadcast receiver sending a message to join the multicast group ff4e::1 as an example.

The first parsing unit 1011 is configured to parse the message sent by the IPv4 multicast receiver. After receiving the message, the transceiver module 104 judges whether the protocol type of the message is IPv4 version or IPv6 version, and when it is determined that the protocol type of the message is IPv4 version, it notifies the first parsing unit 1011 to analyze. After receiving the message sent by the IPv4 multicast receiver, the first parsing unit 1011 judges whether the message is a join message or a leave message, and parses out the parameter information contained in the message. Wherein, the parameter information includes at least the multicast group IP address and the VLAN ID, and the port number of the port receiving the message can be obtained when receiving the message. A multicast group IP address can correspond to multiple port numbers, and a VLAN ID can correspond to multiple port numbers. For example, after the first parsing unit 1011 receives the message, it determines that the port number of the port receiving the message is port 1, and the parsed message parameter information is:

IPv4 multicast group IP address: 224.1.1.1, VLAN ID: 100

The second parsing unit 1012 is configured to parse the message sent by the IPv6 multicast receiver. After receiving the message, the transceiver module 104 judges whether the protocol type of the message is IPv4 version or IPv6 version, and when it is determined that the protocol type of the message is IPv6 version, notifies the second parsing unit 1012 to analyze. After receiving the message sent by the IPv6 multicast receiver, the second parsing unit 1012 judges whether the message is a join message or a leave message and parses out the parameter information contained in the message. Wherein, the parameter information includes at least the multicast group IP address and the port number of the port of the VLAN ID receiving the message. A multicast group IP address can correspond to multiple port numbers, and a VLAN ID can correspond to multiple port numbers. For example, the message parameter information parsed by the parsing unit 1022 is:

IPv6 multicast group IP address: ff4e::1, VLAN ID: 100, port: port 2.

The first query unit 1013 is configured to query the IGMP Snooping entry according to the resolved multicast group IP address. The query unit 1013 maintains all IGMP Snooping entries, and can store all IGMP Snooping entries for query and calling. After the first parsing unit 1011 parses out the parameter information contained in the message, it notifies the first query unit 1013 to perform query. If it is to add a message, the first query unit 1013 queries whether the multicast group IP address contained in the message information analyzed by the first analysis unit 1011 and judges whether the stored IGMP Snooping entry contains the multicast group The set of IGMP Snooping entries of the IP address, if the judgment result is no, then notify the first creation unit 1015 to create an IGMP Snooping entry according to the port number of the multicast group IP address and the port receiving the added message, the IGMP The Snooping table entry promptly forms the IGMP Snooping table entry set corresponding to the multicast group IP address, if the judgment result is yes, then judge whether there is a port number in the IGMP Snooping table entry in the IGMP Snooping table entry set to receive the added The port number of the port of the message, if the port number in the IGMP Snooping table entry in the IGMP Snooping table entry set is the same as the port number of the port receiving the added message, then directly send the IGMP Snooping table entry to the execution Module 102, if there is no port number in the IGMP Snooping entry set in the IGMP Snooping entry set that is identical to the port number of the port that receives the added message, then notify the first creation unit 101 to receive The port number of the port adding the message creates an IGMP Snooping entry in the IGMPSnooping entry set; if it is to leave the message, the first query unit 1013 parses out the message information according to the first analysis unit 1011. Multicast group IP address query and judge whether the stored IGMP Snooping entry contains the IGMP Snooping entry set containing the multicast group IP address. If the judgment result is No, no operation will be performed. If the judgment result is Yes , then determine whether the port number in the IGMP Snooping entry is the same as the port number of the port receiving the leaving message in the IGMP Snooping entry set, if there is no port in the IGMP Snooping entry in the IGMP Snooping entry set No. is the same as the port number of the port receiving the leaving message, then no operation is performed. If the port number in the IGMPSnooping table entry is the same as the port number receiving the port adding and leaving in the IGMP Snooping entry set, Then delete the port number and delete the IGMP Snooping entry. If the IGMP Snooping entry set is empty after deleting the IGMP Snooping entry, delete the IGMP Snooping entry set.

The second query unit 1014 is configured to query the MLD Snooping entry according to the resolved multicast group IP address. The second query unit 1014 maintains all MLD Snooping entries, and can store all MLDSnooping entries for query and call. After the second parsing unit 1012 parses out the parameter information included in the message, it notifies the second query unit 1014 to perform query. If it is to add a message, the second query unit 1014 queries the multicast group IP address contained in the message information analyzed by the second analysis unit 1012 and judges whether the stored MLD Snooping entry contains the multicast group The set of MLD Snooping entries of the IP address, if the judgment result is no, then notify the second creating unit 1016 to create an MLDSnooping entry according to the multicast group IP address and the port number of the port receiving the added message, the MLD Snooping The table item promptly forms the MLDSnooping table item set corresponding to this multicast group IP address, if the judged result is yes, then judge whether there is the port number that MLD Snooping table item contains in this MLD Snooping table item set and receive described joining report If the port number of the port in the MLD Snooping entry set is the same as the port number contained in the MLD Snooping entry in the MLD Snooping entry set, the MLD Snooping entry is directly sent to Execution module 102, if there is no port number included in the MLD Snooping entry set in the MLD Snooping entry set and the port number of the port that receives the described joining message is the same, then notify the second creation unit 1016 according to the multicast group IP address And receive the port number of the port of adding message and create an MLD Snooping entry in the MLD Snooping entry set; Query the multicast group IP address contained in and judge whether there is an MLD Snooping entry set that contains the multicast group IP address in the stored MLD Snooping entry. If the judgment result is no, no operation will be performed. If the result is yes, it is judged whether there is an MLD Snooping entry in the MLD Snooping entry set. The included port number is the same as the port number of the port receiving the leaving message, then no operation is performed, if there is a port number included in the MLD Snooping table entry in the MLD Snooping table entry set If the port number of the port is the same, delete the port number and delete the MLD snooping entry. If the MLD Snooping entry set is empty after deleting the MLDSnooping entry, delete the MLD Snooping entry set.

The first creation unit 1015 is used to create an IGMP Snooping entry. If the first query unit 1013 judges that the stored IGMP Snooping entry does not contain the IGMP Snooping entry set of the multicast group IP address contained in the parsed message, or corresponds to the If the IGMP Snooping entry set of the multicast group IP address does not contain the IGMP Snooping entry of the port number of the port receiving the message, then the first creation unit 1015 will resolve the multicast group The IP address and the port number of the port receiving the message create an IGMP Snooping table entry, which includes the multicast group IP address and VLAN ID contained in the parsed message, and the received message The port number port number of the port, and then send the IGMP Snooping entry to the execution module 102. For example, the created IGMP Snooping entry can be as follows:

IGMP Snooping entry: (224.1.1.1, 100, 1)

Wherein, 224.1.1.1 is the multicast group IP address, 100 is the VLAN ID, and 1 is the port number port number of the port receiving the message. A multicast group IP address can correspond to multiple VLAN IDs, and can also correspond to multiple port numbers, but an IGMP Snooping entry only contains one multicast group IP address, one VLAN ID, and one port number.

The second creating unit 1016 is used to create an MLD Snooping entry. If the second query unit 1014 determines that the stored MLD Snooping entry does not contain the MLD Snooping entry set of the multicast group IP address contained in the parsed message, or corresponds to the If the MLD Snooping entry set of the multicast group IP address does not contain the MLD Snooping entry of the port number of the port receiving the message, then the second creation unit 1016 will resolve the multicast group IP address and the port number of the port receiving the message create an MLD Snooping table entry, which includes the multicast group IP address, VLANID and port number contained in the parsed message, and then the The MLD Snooping entry is sent to the execution module 102. For example, the created MLD snooping entry can be as follows:

MLD Snooping entry: (ff4e::1, 100, 2)

Wherein, ff4e::1 is the multicast group IP address, 100 is the VLAN ID, and 2 is the port number port number of the port receiving the message. A multicast group IP address can correspond to multiple VLAN IDs, and can also correspond to multiple port numbers, but an MLD Snooping entry only contains one multicast group IP address, one VLANID, and one port number.

Referring to FIG. 3B , the execution module 102 specifically includes an operation unit 1021 and an address table unit 1022 . Wherein, the execution module 102 may be realized by a function.

The operation unit 1021 is used to add or delete MAC forwarding entries. A multicast MAC address may correspond to multiple MAC forwarding entries, and the multiple MAC forwarding entries form a set of multicast MAC forwarding entries corresponding to the multicast MAC address, and a MAC forwarding entry includes a MAC address and a port number. If the message received by the processing module 101 is a join message, after the conversion module 103 maps the multicast group IP address carried in the message to a multicast MAC address, the operation unit 1021 in the execution module 102 inquires and judges that the existing Whether there is a set of multicast MAC forwarding entries corresponding to the multicast MAC address mapped to the multicast group IP address in the received join message in the MAC forwarding entry of The address and the port number carried in the first entry or the second entry create a multicast MAC forwarding entry, and the multicast MAC forwarding entry forms a set of multicast MAC forwarding entries corresponding to the multicast MAC address. If the judgment result If yes, then judge whether the port number contained in the MAC forwarding entry in the multicast MAC forwarding entry set is the same as the port number carried in the first table entry or the second table entry, and whether the port number in the first table entry or the second table entry The port number carried is the port number of the sender of the join message. If there is a MAC forwarding entry in the multicast MAC forwarding entry set, the port number contained in the MAC forwarding entry is the same as the port number carried in the first entry or the second entry. , then no operation is performed. If there is no MAC forwarding entry in the multicast MAC forwarding entry set that contains the same port number as the port number carried in the first or second entry, then according to the multicast MAC address and The port number carried in the first entry or the second entry adds a MAC forwarding entry to the set of multicast MAC forwarding entries. If the message received by the processing module 101 is a leave message, the operation unit 1021 queries and judges whether there is a multicast MAC address mapped to the multicast group IP address in the received join message in the existing MAC forwarding entry The corresponding multicast MAC forwarding entry set, if the judgment result is no, then do not do any operation, if the judgment result is yes, then judge whether the multicast MAC forwarding entry set has the port number contained in the MAC forwarding entry and the first The port number carried in the table entry or the second table entry is the same, and the port number carried in the first table entry or the second table entry is the port number that joins and leaves the sender. If there is a MAC address in the multicast MAC forwarding entry set The port number contained in the forwarding entry is the same as the port number carried in the first entry or the second entry, then the operation unit 1021 deletes the port number in the multicast MAC forwarding entry, and deletes the MAC forwarding entry. After the MAC forwarding entry, the multicast MAC forwarding entry set is empty, then delete the multicast MAC forwarding entry set, if there is no port number contained in the MAC forwarding entry in the multicast MAC forwarding entry set and the first table item or the second If the port numbers carried in the two entries are the same, no operation is performed.

The address table unit 1022 is used to uniformly store MAC addresses. The address table unit 1022 includes a public MAC address table, wherein the MAC address is stored, and the conversion module 103 maps the multicast group IP address included in the IGMP Snooping table item or the multicast group IP address included in the MLD Snooping table item to After the MAC addresses are multicast, they are all stored in the public MAC address table of the address table unit 1022 . All MAC forwarding entries created according to MAC addresses and port numbers are also stored in the public MAC address table. The VLAN ID of the destination port is not included in the MAC forwarding entry, that is, the corresponding VLAN ID of the IPv4 multicast receiver or the IPv6 multicast receiver, and the VLAN ID can be stored in the address table.

The following describes the multicast method through the process.

Referring to Figure 4, the main flow of the MAC address update method is as follows:

Step 401: Obtain the multicast group IP address of the IPv4 version or the multicast group IP address of the IPv6 version according to the received message.

Step 402: when obtaining the multicast group IP address of the IPv4 version, map the multicast group IP address of the obtained IPv4 version to a multicast media access control MAC address; when obtaining the multicast group IP address of the IPv6 version, map The obtained IPv6 multicast group IP address is mapped to a multicast MAC address.

Step 403: Update the public MAC address table according to the obtained multicast MAC address.

Referring to FIG. 5 , the embodiment of the present invention takes receiving a joining message as an example. When the added message is IPv4 version, the detailed method of obtaining IGMP Snooping entries is as follows:

Step 501: Receive a joining message, and obtain the port number of the port receiving the joining message. Wherein, the joining message is sent by the IPv4 multicast receiver.

Step 502: Analyze the joining message to obtain the multicast group IP address and VLAN ID. Judge the protocol type of the adding message, and determine whether it is IPv4 or IPv6.

Step 503: According to the IP address of the multicast group, it is judged whether there is a corresponding IGMP Snooping entry set. When the judgment result is yes, go to step 504, otherwise go to step 505. If the joining message received in step 501 is sent by the IPv6 multicast receiver, then this step is to judge whether there is a corresponding MLD Snooping entry.

Step 504: Determine whether the port number contained in the IGMP Snooping entry in the IGMP Snooping entry set is the same as the port number of the port receiving the join message. When the judgment result is no, go to step 505 , otherwise go to step 506 .

Step 505: Create an IGMP Snooping entry according to the multicast group IP address, VLAN ID and port number. For example, an IGMP Snooping entry can be: (224.1.1.1, 100, 1). Execute step 507. If the joining message received in step 501 is sent by the IPv6 multicast receiver, then this step is to create an MLD Snooping entry according to the multicast group IP address, VLAN ID and port number.

Step 506: Send the IGMP Snooping entry to the execution module 102. In specific implementation, the interface function of the execution module 102 may be called. If the join message received in step 501 is sent by the IPv6 multicast receiver, then this step is to send the MLD Snooping entry to the execution module 102.

Referring to Fig. 6, the embodiment of the present invention takes receiving the join message as an example, when the received join message is an IPv6 version, the detailed method flow for obtaining the MAC address is as follows:

Step 601: Receive an MLD Snooping entry. If the received Join message is of IPv4 version, the IGMP Snooping entry is received in this step.

Step 602: Determine that the IP address version of the MLD Snooping entry is IPv6. If what received in the step 601 is the IGMP Snooping entry, then this step is to determine that the IP address version of the IGMP Snooping entry is IPv4.

Step 603: Map the multicast group IP address included in the MLD Snooping entry to obtain a multicast MAC address. Wherein, the multicast group IP address of the IPv6 version is 128 bits, and the mapped MAC address is 48 bits. For example, the multicast MAC address obtained after mapping the multicast group IP address of ff4e::1 is 3333.0000.0001. If it is determined in step 602 that the IP address version of the IGMP Snooping entry is IPv4, then this step is to map the multicast group IP address included in the IGMP Snooping entry to obtain the multicast MAC address.

Step 604: Determine whether there is a set of multicast MAC forwarding entries corresponding to the multicast MAC address among the existing MAC forwarding entries. Wherein, the corresponding means that among the existing MAC forwarding entries, there is a multicast MAC address corresponding to the set of multicast MAC forwarding entries that is the same as the multicast MAC address. When the judgment result is yes, go to step 605, otherwise go to step 606.

Step 605: Determine whether the port number included in the MAC forwarding entry in the multicast MAC forwarding entry set is the same as the port number carried in the second entry. When the judgment result is no, go to step 606 , otherwise go to step 607 . If what received in the step 601 is the IGMP Snooping entry, then this step is to judge whether the port number contained in the MAC forwarding entry is identical to the port number carried in the first table entry for judging whether the MAC forwarding entry set is multicast. .

Step 606: Add a MAC forwarding entry according to the multicast MAC address and the port number carried in the second entry.

Step 607: Send the MLD Snooping entry to the execution module 102.

Referring to Fig. 7, in the embodiment of the present invention, taking the receipt of the leaving message as an example, when the leaving message is an IPv4 version, the detailed method flow for processing the IGMP Snooping entry is as follows:

Step 701: Receive the leaving message, and obtain the port number of the port receiving the leaving message. Wherein, the leave message is sent by the IPv4 multicast receiver.

Step 702: Determine that the outgoing message is of IPv4 version. Alternatively, the leave message may also be in IPv6 version.

Step 703: Analyze the leave message to obtain the multicast group IP address and VLAN ID.

Step 704: According to the IP address of the multicast group, it is judged whether there is a corresponding IGMP Snooping entry set. When the judgment result is yes, execute step 704, otherwise end the process. If it is determined in step 702 that the leaving message is an IPv6 version, then this step is to judge whether there is a corresponding MLD Snooping entry according to the multicast group IP address.

Step 705: Determine whether the port number contained in the IGMP Snooping entry in the IGMP Snooping entry set is the same as the port number of the port receiving the leaving message. When the judgment result is yes, execute step 706, otherwise end the process.

Step 706: Delete the port number in the IGMP Snooping entry, and delete the IGMPSnooping entry.

Step 707: Determine whether the IGMP Snooping entry set is empty. When the judgment result is yes, continue to step 708, otherwise end the process.

Step 708: Delete the IGMP Snooping entry set.

Referring to Fig. 8, in the embodiment of the present invention, taking the leaving message as an example, when the leaving message is an IPv6 version, the detailed method flow for processing the MLD Snooping entry is as follows:

Step 801: Obtain the multicast group IP address in the MLD Snooping entry. If the leaving message is an IPv4 version, then this step is to obtain the multicast group IP address in the IGMP Snooping entry.

Step 802: Determine that the IP address version of the MLD Snooping entry is IPv6. If step 801 is to obtain the multicast group IP address in the IGMP Snooping table entry, then this step is to determine that the IP address version of the IGMP Snooping table entry is IPv4.

Step 803: Map the multicast group IP address included in the MLD Snooping entry to obtain a multicast MAC address. Wherein, the multicast group IP address of the IPv6 version is 128 bits, and the multicast MAC address obtained by mapping is 48 bits. For example, the multicast MAC address obtained after mapping the multicast group IP address of ff4e::1 is 3333.0000.0001. If it is determined in step 602 that the IP address version of the IGMP Snooping entry is IPv4, then this step is to map the multicast group IP address included in the IGMP Snooping entry to obtain the multicast MAC address.

Step 804: Determine whether there is a set of multicast MAC forwarding entries corresponding to the multicast group IP address among the existing MAC forwarding entries. Wherein, the corresponding means that among the existing MAC forwarding entries, the MAC address included in the MAC forwarding entry is the same as the multicast MAC address. When the judgment result is yes, execute step 805, otherwise end the process.

Step 805: Determine whether the port number included in the multicast MAC forwarding entry in the set of MAC forwarding entries is the same as the port number carried in the second entry. When the judgment result is yes, execute step 806, otherwise end the process.

Step 806: Delete the port number in the multicast MAC forwarding entry, and delete the MAC forwarding entry.

Step 807: Determine whether the set of multicast MAC forwarding entries is empty. When the judgment result is yes, execute step 808, otherwise end the process.

Step 808: Delete the set of multicast MAC forwarding entries.

The embodiment of the present invention obtains the multicast group IP address of the Internet Protocol version 4 IPv4 version or the multicast group IP address of the Internet Protocol version 6 IPv6 version according to the received message; when obtaining the multicast group IP address of the IPv4 version, the obtained The multicast group IP address of the IPv4 version is mapped to the multicast media access control MAC address; when the multicast group IP address of the IPv6 version is obtained, the multicast group IP address of the obtained IPv6 version is mapped to the multicast MAC address; according to The obtained multicast MAC address updates the public MAC address table. The MAC addresses of IPv4 and IPv6 are stored uniformly, and the IPv4 and IPv6 protocol stacks no longer need to maintain their respective public MAC address tables, saving memory resources. In addition, IPv4 and IPv6 dual protocol stacks are managed by the same execution module 102, which reduces the complexity of software implementation. Moreover, when implementing security management for multicast MAC addresses, coupling with specific protocol versions can be avoided, and MAC transplantation is enhanced. It also realizes unified storage and maintenance of MAC addresses. When processing leave packets, if the IGMP Snooping entry set or MLD Snooping entry set is empty after deleting the corresponding IGMP Snooping entry or MLD Snooping entry, delete The IGMP Snooping entry set or the MLD Snooping entry set, if the multicast MAC forwarding entry set is empty after deleting the corresponding MAC forwarding entry, then delete the MAC forwarding entry set, thereby effectively saving memory space and making the public MAC address table The stored information is more reasonable and easy to use.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (16)

1. a MAC Address update method is characterized in that, may further comprise the steps:

Obtain the multicast group IP address of Internet Protocol Version 4 IPv4 version or the multicast group IP address of IPv6 IPv6 version according to the message of receiving;

When obtaining the multicast group IP address of IPv4 version, be multicast media access control MAC address with the multicast group IP map addresses of the IPv4 version that obtains; When obtaining the multicast group IP address of IPv6 version, be multicast mac address with the multicast group IP map addresses of the IPv6 version that obtains;

Upgrade public mac address table according to the multicast mac address that obtains.

2. the method for claim 1 is characterized in that, the described message of receiving is for joining message, and when obtaining the multicast group IP address of IPv4 version, is multicast media access control MAC address with the multicast group IP map addresses of the IPv4 version that obtains; When obtaining the multicast group IP address of IPv6 version, be also to comprise step before the multicast mac address with the multicast group IP map addresses of the IPv6 version that obtains:

When the multicast group IP address that obtains the IPv4 version according to the message of receiving, judge first list item set whether Internet group management protocol of the multicast group is spied upon has among the IGMP Snooping corresponding to the multicast group IP address of described IPv4 version, when judged result for not the time, comprise first list item of the port numbers of receiving the described port that joins message according to the multicast group IP address creation of IPv4 version;

When the multicast group IP address that obtains the IPv6 version according to the message of receiving, judge second list item set whether multicast listener discovery is spied upon has among the MLD Snooping corresponding to the multicast group IP address of described IPv6 version, when judged result for not the time, comprise second list item of the port numbers of receiving the described port that joins message according to the multicast group IP address creation of IPv6 version.

3. method as claimed in claim 2 is characterized in that,

When judgement defines first list item set corresponding to the multicast group IP address of described IPv4 version, judge that the port numbers that whether has first list item to be comprised in described first list item set is identical with the port numbers of receiving the described port that joins message, when the port numbers that does not have first list item to be comprised in described first list item set is identical with the port numbers of receiving the described port that joins message, comprise first list item of the port numbers of receiving the described port that joins message according to the multicast group IP address creation of described IPv4 version; Perhaps

When judgement defines second list item set corresponding to the multicast group IP address of described IPv6 version, judge that the port numbers that whether has second list item to be comprised in described second list item set set is identical with the port numbers of receiving the described port that joins message, when the port numbers that does not have first list item to be comprised in described second list item set is identical with the port numbers of receiving the described port that joins message, comprise second list item of the port numbers of receiving the described port that joins message according to the multicast group IP address creation of described IPv6 version.

4. as claim 2 or 3 described methods, it is characterized in that, the described message of receiving is for joining message, the step of upgrading public mac address table according to the multicast mac address that obtains comprises: judge the multicast MAC forwarding entry set that whether has in the public mac address table corresponding to the multicast mac address of described acquisition, when judged result for not the time, create the MAC forwarding entry that comprises the port numbers of carrying in described first list item or second list item according to the multicast mac address that obtains, when judged result when being, judge that whether the port numbers of carrying in port numbers that the MAC forwarding entry comprised and described first list item or second list item is arranged in the set of described multicast MAC forwarding entry is identical, when the port numbers of carrying in the port numbers that does not have the MAC forwarding entry to be comprised in the set of described multicast MAC forwarding entry and described first list item or second list item was identical, interpolation in described multicast MAC forwarding entry set comprised the MAC forwarding entry of the port numbers of carrying in described first list item or second list item according to described multicast mac address.

5. the method for claim 1 is characterized in that, the described message of receiving is a leave message, when obtaining the multicast group IP address of IPv4 version, is multicast media access control MAC address with the multicast group IP map addresses of the IPv4 version that obtains; When obtaining the multicast group IP address of IPv6 version, be also to comprise step before the multicast mac address with the multicast group IP map addresses of the IPv6 version that obtains:

Judge first list item set that whether has among the IGMP Snooping corresponding to the multicast group IP address of described IPv4 version, when judged result when being, judge that the port numbers that whether has first list item to be comprised in described first list item set is identical with the port numbers of the port of receiving described leave message, when the port numbers that first list item port numbers that is comprised and the port of receiving described leave message are arranged in described first list item set is identical, this port numbers of deletion in described first list item, and delete described first list item; Perhaps

Judge second list item set that whether has among the MLD Snooping corresponding to the multicast group IP address of described IPv6 version, when judged result when being, judge that the port numbers that whether has second list item to be comprised in described second list item set is identical with the port numbers of the port of receiving described leave message, when the port numbers that second list item port numbers that is comprised and the port of receiving described leave message are arranged in described second list item set is identical, in this port numbers of middle deletion of described second list item, and delete described second list item.

6. method as claimed in claim 5 is characterized in that, also comprises step:

Judge whether the set of described first list item is empty, when judged result when being, delete described first list item and gather; Perhaps

Judge whether the set of described second list item is empty, when judged result when being, delete described second list item and gather.

7. as claim 5 or 6 described methods, it is characterized in that, the described message of receiving is a leave message, the step of upgrading public mac address table according to the multicast mac address that obtains comprises: judge whether the multicast MAC forwarding entry set corresponding to the multicast mac address of described acquisition, when judged result when being, judge that whether the port numbers of carrying in port numbers that the MAC forwarding entry comprised and described first list item or second list item is arranged in the set of described multicast MAC forwarding entry is identical, when the port numbers of carrying in the port numbers that has the MAC forwarding entry to be comprised in the set of described multicast MAC forwarding entry and described first list item or second list item is identical, this port numbers of deletion in described MAC forwarding entry, and delete described MAC forwarding entry; Continuation judges whether described multicast MAC forwarding entry set is empty, when described multicast MAC forwarding entry set is sky, deletes described multicast MAC forwarding entry set.

8. a method of multicasting is characterized in that, may further comprise the steps:

Obtain the multicast group IP address of IPv4 version or the multicast group IP address of IPv6 version according to the message of receiving;

When obtaining the multicast group IP address of IPv4 version, be multicast media access control MAC address with the multicast group IP map addresses of the IPv4 version that obtains; When obtaining the multicast group IP address of IPv6 version, be multicast mac address with the multicast group IP map addresses of the IPv6 version that obtains;

In public mac address table, inquire about and described multicast mac address corresponding port number according to described multicast mac address, carry out data forwarding according to described port numbers.

9. a MAC Address updating device is characterized in that, comprising:

Processing module is used for obtaining the multicast group IP address of IPv4 version or the multicast group IP address of IPv6 version according to the message of receiving;

Modular converter is used for when obtaining the multicast group IP address of IPv4 version, is multicast media access control MAC address with the multicast group IP map addresses of the IPv4 version that obtains; When obtaining the multicast group IP address of IPv6 version, be multicast mac address with the multicast group IP map addresses of the IPv6 version that obtains;

Executive Module is used for upgrading public mac address table according to the multicast mac address that obtains.

10. device as claimed in claim 9, it is characterized in that, the described message of receiving is for joining message, described processing module also is used for when the multicast group IP address that obtains the IPv4 version according to the message of receiving, judge first list item set whether Internet group management protocol of the multicast group is spied upon has among the IGMP Snooping corresponding to the multicast group IP address of described IPv4 version, when judged result for not the time, comprise first list item of the port numbers of receiving the described port that joins message according to the multicast group IP address creation of IPv4 version; When the multicast group IP address that obtains the IPv6 version according to the message of receiving, judge second list item set whether multicast listener discovery is spied upon has among the MLD Snooping corresponding to the multicast group IP address of described IPv6 version, when judged result for not the time, comprise second list item of the port numbers of receiving the described port that joins message according to the multicast group IP address creation of IPv6 version.

11. device as claimed in claim 10, it is characterized in that, described processing module also is used for when judging first list item set define corresponding to the multicast group IP address of described IPv4 version, judge that the port numbers that whether has first list item to be comprised in described first list item set is identical with the port numbers of receiving the described port that joins message, when the port numbers that does not have first list item to be comprised in described first list item set is identical with the port numbers of receiving the described port that joins message, comprise first list item of the port numbers of receiving the described port that joins message according to the multicast group IP address creation of described IPv4 version; Perhaps when judging second list item set define corresponding to the multicast group IP address of described IPv6 version, judge that the port numbers that whether has second list item to be comprised in described second list item set is identical with the port numbers of receiving the described port that joins message, when the port numbers that does not have first list item to be comprised in described second list item set is identical with the port numbers of receiving the described port that joins message, comprise second list item of the port numbers of receiving the described port that joins message according to the multicast group IP address creation of described IPv6 version.

12. as claim 10 or 11 described devices, it is characterized in that, the described message of receiving is for joining message, described Executive Module is used for judging whether public mac address table has the multicast MAC forwarding entry set corresponding to the multicast mac address of described acquisition, when judged result for not the time, create the MAC forwarding entry that comprises the port numbers of carrying in described first list item or second list item according to the multicast mac address that obtains, when judged result when being, judge that whether the port numbers of carrying in port numbers that the MAC forwarding entry comprised and described first list item or second list item is arranged in the set of described multicast MAC forwarding entry is identical, when the port numbers of carrying in the port numbers that does not have the MAC forwarding entry to be comprised in the set of described multicast MAC forwarding entry and described first list item or second list item was identical, interpolation in described multicast MAC forwarding entry set comprised the MAC forwarding entry of the port numbers of carrying in described first list item or second list item according to described multicast mac address.

13. device as claimed in claim 9, it is characterized in that, the described message of receiving is a leave message, described processing module is used for also judging whether IGMP Snooping has first list item set corresponding to the multicast group IP address of described IPv4 version, when judged result when being, judge that the port numbers that whether has first list item to be comprised in described first list item set is identical with the port numbers of the port of receiving described leave message, when the port numbers that first list item port numbers that is comprised and the port of receiving described leave message are arranged in described first list item set is identical, this port numbers of deletion in described first list item, and delete described first list item; Perhaps judge second list item set that whether has among the MLD Snooping corresponding to the multicast group IP address of described IPv6 version, when judged result when being, judge that the port numbers that whether has second list item to be comprised in described second list item set is identical with the port numbers of the port of receiving described leave message, when the port numbers that second list item port numbers that is comprised and the port of receiving described leave message are arranged in described second list item set is identical, this port numbers of deletion in described second list item, and delete described second list item.

14. device as claimed in claim 13 is characterized in that, described processing module is used to also judge whether the set of described first list item is empty, when judged result when being, delete described first list item and gather; Judge perhaps whether the set of described second list item is empty, when judged result when being, delete described second list item and gather.

15. as claim 13 or 14 described devices, it is characterized in that, the described message of receiving is a leave message, described Executive Module is used to judge whether the multicast MAC forwarding entry set corresponding to the multicast mac address of described acquisition, when judged result when being, judge that whether the port numbers of carrying in port numbers that the MAC forwarding entry comprised and described first list item or second list item is arranged in the set of described multicast MAC forwarding entry is identical, the port numbers of carrying in the port numbers that has the MAC forwarding entry to be comprised in the set of described multicast MAC forwarding entry and described first list item or second list item is identical, this port numbers of deletion in described multicast MAC forwarding entry, and delete described MAC forwarding entry; Continuation judges whether described multicast MAC forwarding entry set is empty, when described multicast MAC forwarding entry set is sky, deletes described multicast MAC forwarding entry set.

16. a multicast apparatus is characterized in that, comprising:

Processing module is used for obtaining the multicast group IP address of IPv4 version or the multicast group IP address of IPv6 version according to the message of receiving;

Modular converter is used for when obtaining the multicast group IP address of IPv4 version, is multicast media access control MAC address with the multicast group IP map addresses of the IPv4 version that obtains; When obtaining the multicast group IP address of IPv6 version, be multicast mac address with the multicast group IP map addresses of the IPv6 version that obtains;

Executive Module is used for according to described multicast mac address carrying out data forwarding in the inquiry of public mac address table and described multicast mac address corresponding port number according to described port numbers.

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