CN107294857A - Distribution processing method, the apparatus and system of multicast - Google Patents

Abstract

The present invention provides a multicast distribution processing method, device and system, wherein the method includes: the virtual network control entity NVA acquires a join message sent by a virtual network edge node NVE, and the join message is a multicast group connected to the NVE The join message sent by the first group member, the join message includes: the information of the first group member, the information of the multicast group, and the virtual network information of the virtual network where the first group member is located, the NVA according to the join The message adds the first group member to the multicast group, the NVA obtains the multicast capability of the virtual network where the NVE is located, determines the forwarding entry information according to the multicast capability, and sends the forwarding entry information to the NVE, wherein , the multicast capability information includes: whether a point-to-multipoint multicast tunnel is supported, which solves the problem of limited multicast forwarding capability of the virtual network and improves the multicast forwarding capability of the virtual network.

Description

Multicast distribution processing method, device and system

technical field

The present invention relates to the communication field, in particular, to a multicast distribution processing method, device and system.

Background technique

With the extensive use of data center server virtualization technology, the number of virtual machines has increased sharply, and in hybrid cloud and public cloud data centers, it is necessary to provide support for a large number of tenants, and traditional networks cannot meet the demand. In order to meet the needs of this multi-tenant (tenant), an overlay-based virtual overlay network (Network Virtualization overlay, referred to as NVO) technology came into being. This virtual overlay network can not only support multi-tenant, multi-virtual network, Moreover, the address space and traffic between each tenant are isolated from each other and invisible. Each tenant can use the same address space in different VNs. Each tenant can have multiple virtual networks (Network Virtualization, referred to as VN for short), but the traffic between each VN cannot flow freely, and can only be realized through routers and security gateways. Network Virtualization over Layer 3 (NVo3 for short) based on Layer 3 can solve the problems of virtual machine migration and multi-tenancy without changing the existing network, and only needs to add gateway devices, effectively protecting user investment.

In order to realize NVO, it is necessary to virtualize the terminal (Terminal Services, referred to as TS) edge device connected to the network, identify the terminal message, make corresponding encapsulation of the message and then connect it to the traditional network for transmission . At present, the more common technologies include VXLAN (Virtual eXtensible Local Area Network) and NVGRE (Network Virtual GRE), both of which can support the transmission of Layer 2 packets to the Layer 3 network, and the access of Layer 3 packets to the Layer 3 network. On the virtual stacked network, the location of the virtual network edge device NVE can be inside a host management program (hypervisor), or on an external router (The Onion Router, ToR for short). If it is on an external ToR, it can be on the ToR that is directly physically connected to the terminal, or it can be on the ToR that is connected through a bridge.

In related technologies, many existing control protocols can be applied to virtual stacked networks to realize information exchange and determine forwarding paths. A huge challenge, especially for multicast packets.

Aiming at the problem of limited multicast forwarding capability of the virtual network in related technologies, there is no effective solution at present.

Contents of the invention

The present invention provides a multicast distribution processing method, device and system to at least solve the problem of limited multicast forwarding capability of a virtual network in the related art.

According to one aspect of the present invention, a multicast distribution processing method is provided, including:

A virtual network control entity (Network Virtualization Authority, referred to as NVA) obtains a join message sent by a virtual network edge node (Network Virtualization Edge, referred to as NVE), and the join message is the first group member in the multicast group connected to the NVE The join message sent, the join message includes: the information of the first group member, the information of the multicast group, and the virtual network information of the virtual network where the first group member is located;

The NVA joins the first group member to the multicast group according to the join message.

Further, after the NVA joins the first group member to the multicast group according to the joining message, it includes:

In the case that the join message further includes the multicast capability information of the virtual network where the NVE is located, the NVA determines forwarding entry information according to the multicast capability information, and sends the forwarding entry information to the NVE, wherein the multicast capability information includes: whether point-to-multipoint multicast tunnels are supported.

Further, when the virtual network supports multicast forwarding, the forwarding entry information indicates that the NVE is connected to other group members in the multicast group to establish a point-to-multipoint tunnel connection, and the Other group members are group members other than the first group member in the multicast group; when the virtual network does not support multicast forwarding, the forwarding entry information indicates that the NVE and the other The NVEs where the group members are located establish multiple point-to-point tunnel connections.

Further, after the NVA joins the first group member to the multicast group according to the joining message, the method further includes:

The NVA acquires the leave message sent by the NVE, the leave message is a leave message sent by the first group member in the multicast group connected to the NVE, and the leave message includes: information of the first group member , the multicast address information of the leaving multicast group, and the virtual network identifier VNID of the virtual network where the first group member is located;

The NVA deletes the first group member from the multicast group according to the leave message;

The NVA deletes tunnel connections between the first group member and the other group members.

Further, sending the forwarding entry information to the NVE includes:

When the virtual network does not support multicast forwarding, the NVA obtains the address information of the NVE where the other group members are located, and carries the address information of the NVE where the other group members are located in the forwarding entry information , sending the forwarding entry information to the NVE, the forwarding entry information instructing the NVE to establish multiple point-to-point tunnel connections with the NVEs connected to the other group members.

Further, the virtual network includes: a virtual stacked network NVO.

According to another aspect of the present invention, a multicast distribution processing method is also provided, including:

The virtual network edge node NVE obtains the joining message sent by the first group member in the multicast group connected to the NVE, and the joining message includes: information of the first group member, information of the multicast group, and the Virtual network information of the virtual network where the members of the first group belong;

The NVE sends the joining message to the virtual network control entity NVA.

Further, the NVE sending the joining message to the virtual network control entity NVA includes: sending the joining message to the NVA when the joining message carries multicast capability information of the virtual network where the NVE is located, Wherein, the multicast capability information includes: whether a point-to-multipoint multicast tunnel is supported;

After the NVE sends the joining message to the virtual network control entity NVA, the NVE receives the forwarding entry information sent by the NVA.

Further, in the case that the virtual network connected to the NVE supports multicast forwarding, the forwarding entry information indicates that the NVE establishes a point-to-multipoint tunnel with the NVE connected to other group members of the multicast group connection, the other group members are group members other than the first group member in the multicast group; when the virtual network connected by the NVE does not support multicast forwarding, the forwarding entry information indicates The NVE establishes multiple point-to-point tunnel connections with the NVEs connected to the other group members.

Further, after the NVE sends the join message to the virtual network control entity NVA, the method further includes:

The NVE acquires a leaving message, the leaving message is a leaving message sent by the first group member, and the leaving message includes: information of the first group member, the multicast address of the leaving multicast group information, and the virtual network identifier VNID of the virtual network where the first group member is located;

The NVE sends the leave message to the NVA, the leave message is used to instruct the NVA to delete the first group member from the multicast group, and instruct the NVA to delete the first group Tunnel connections between members and said other group members.

According to another aspect of the present invention, there is also provided a multicast distribution processing device located in a virtual network control entity NVA, including:

The first obtaining module is used to obtain the join message sent by the virtual network edge node NVE, the join message is the join message sent by the first group member in the multicast group connected to the NVE, and the join message includes: the The information of the first group member, the information of the multicast group, and the virtual network information of the virtual network where the first group member is located;

A multicast module, configured to add the first group member to the multicast group according to the join message.

Further, the device also includes:

The first sending module is further configured to, in the case that the join message further includes multicast capability information of the virtual network where the NVE is located, the NVA determines forwarding entry information according to the multicast capability information, and sends the The forwarding entry information is sent to the NVE, wherein the multicast capability information includes: whether point-to-multipoint multicast tunnel is supported.

Further, when the virtual network supports multicast forwarding, the forwarding entry information indicates that the NVE is connected to other group members in the multicast group to establish a point-to-multipoint tunnel connection, and the Other group members are group members other than the first group member in the multicast group; when the virtual network does not support multicast forwarding, the forwarding entry information indicates that the NVE and the other The NVEs where the group members are located establish multiple point-to-point tunnel connections.

Further, the first obtaining module is also used for the NVA to obtain the leave message sent by the NVE after the NVA joins the first group member to the multicast group according to the join message, and the leave message is A leave message sent by the first group member in the multicast group connected to the NVE, the leave message includes: the information of the first group member, the multicast address information of the left multicast group, and the The virtual network identifier VNID of the virtual network where the members of the first group belong;

The multicast module is further configured to delete the first group member from the multicast group according to the leave message;

The multicast module is also used for deleting the tunnel connection between the first group member and the other group members.

Further, the first sending module is further configured to obtain address information of the NVE where the other group members are located when the virtual network does not support multicast forwarding, and send the address information of the NVE where the other group members are located The address information is carried in the forwarding entry information, and the forwarding entry information is sent to the NVE, and the forwarding entry information instructs the NVE to establish multiple point-to-point tunnel connections with the NVEs connected to the other group members.

According to another aspect of the present invention, there is also provided a multicast distribution processing device located at a virtual network edge node NVE, including:

The second acquiring module is configured to acquire a join message sent by a first group member in the multicast group connected to the NVE, where the join message includes: information about the first group member, information about the multicast group, and virtual network information of the virtual network where the members of the first group belong;

The second sending module is configured to send the joining message to the virtual network control entity NVA.

Further, the device also includes: a receiving module;

The second sending module is configured to send the join message to the NVA when the join message carries multicast capability information of the virtual network where the NVE is located, wherein the multicast capability information includes: whether to support Point-to-multipoint multicast tunnel;

The receiving module is configured to receive the forwarding entry information sent by the NVA after the second sending module sends the join message to the virtual network control entity NVA.

Further, the second obtaining module is configured to obtain, after the receiving module receives the forwarding entry information sent by the NVA, a leaving message, where the leaving message is a leaving message sent by a member of the first group, and the The leaving message includes: the information of the first group member, the multicast address information of the leaving multicast group, and the virtual network identifier VNID of the virtual network where the first group member is located;

The second sending module is configured to send the leave message to the NVA, the leave message is used to instruct the NVA to delete the first group member from the multicast group, and instruct the NVA Deleting tunnel connections between the first group member and the other group members.

According to another aspect of the present invention, a multicast distribution processing system is also provided, including: a virtual network control entity NVA and a virtual network edge node NVE;

The NVA acquires a join message sent by the NVE, the join message is a join message sent by the first group member in the multicast group connected to the NVE, and the join message includes: information of the first group member , the information of the multicast group, and the virtual network information of the virtual network where the members of the first group are located;

The NVA joins the first group member to the multicast group according to the join message.

Through the present invention, the virtual network control entity NVA obtains the joining message sent by the virtual network edge node NVE, the joining message is the joining message sent by the first member of the multicast group connected to the NVE, and the joining message includes: the first The information of the group members, the information of the multicast group, and the virtual network information of the virtual network where the first group member is located. The NVA adds the first group member to the multicast group according to the join message, which solves the problem of the virtual network. The problem of limited multicast forwarding capability improves the multicast forwarding capability of the virtual network.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a flowchart 1 of a multicast distribution processing method according to an embodiment of the present invention;

FIG. 2 is a second flowchart of a multicast distribution processing method according to an embodiment of the present invention;

FIG. 3 is a structural block diagram 1 of a multicast distribution processing device according to an embodiment of the present invention;

FIG. 4 is a second structural block diagram of a multicast distribution processing device according to an embodiment of the present invention;

FIG. 5 is a block diagram three of a multicast distribution processing device according to an embodiment of the present invention;

FIG. 6 is a fourth structural block diagram of a multicast distribution processing device according to an embodiment of the present invention;

Fig. 7 is a schematic diagram of networking according to a preferred embodiment of the present invention;

Fig. 8 is a schematic diagram of the basic message format of the VNTP protocol according to a preferred embodiment of the present invention;

Fig. 9 is a schematic diagram of the definition of the NVE announcement multicast message Type field of the preferred embodiment of the present invention;

Fig. 10 is a schematic diagram of the definition of the data field of the NVE announcement multicast message of the preferred embodiment of the present invention;

FIG. 11 is a first schematic diagram of the definition of the data field of the reply message from NVA to NVE in the preferred embodiment of the present invention;

Fig. 12 is a second schematic diagram of the definition of the data field of the reply message from NVA to NVE in the preferred embodiment of the present invention;

Fig. 13 is a third schematic diagram of the definition of the data field of the reply message from NVA to NVE in the preferred embodiment of the present invention.

detailed description

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence.

In this embodiment, a method for distributing and processing multicast is provided. FIG. 1 is a flow chart 1 of a method for distributing and processing multicast according to an embodiment of the present invention. As shown in FIG. 1 , the process includes the following steps:

Step S102, the virtual network control entity referred to as NVA obtains the joining message sent by the virtual network edge node NVE, the joining message is the joining message sent by the first member of the multicast group connected to the NVE, and the joining message includes: the first Information of a group of members, information of the multicast group, and virtual network information of the virtual network where the first group member is located;

Step S104, the NVA joins the first group member into the multicast group according to the joining message.

Through the above steps, the virtual network control entity NVA obtains the joining message sent by the virtual network edge node NVE, the joining message is the joining message sent by the first member of the multicast group connected to the NVE, and the joining message includes: the first The information of the group members, the information of the multicast group, and the virtual network information of the virtual network where the first group member is located. The NVA adds the first group member to the multicast group according to the join message, which solves the problem of the virtual network. The problem of limited multicast forwarding capability improves the multicast forwarding capability of the virtual network.

In an embodiment of the present invention, after the NVA joins the first group member to the multicast group according to the joining message, if the joining message also includes the multicast capability information of the virtual network where the NVE is located, the The NVA determines forwarding entry information according to the multicast capability information, and sends the forwarding entry information to the NVE, wherein the multicast capability information includes: whether point-to-multipoint multicast tunnel is supported.

In an embodiment of the present invention, when the virtual network supports multicast forwarding, the forwarding entry information indicates that the NVE establishes a point-to-multipoint tunnel connection with the NVE connected to other group members in the multicast group. Other group members are group members other than the first group member in the multicast group; in the case that the virtual network does not support multicast forwarding, the forwarding entry information indicates that the NVE is established with the NVE where the other group members are located. Multiple point-to-point tunnel connections.

In an embodiment of the present invention, after the NVA joins the first group member into the multicast group according to the join message, the method further includes:

The NVA acquires the leaving message sent by the NVE, which is the leaving message sent by the first group member in the multicast group connected to the NVE, and the leaving message includes: the information of the first group member, the leaving multicast The multicast address information of the group, and the virtual network identifier VNID of the virtual network where the first group member is located;

The NVA deletes the first group member from the multicast group according to the leaving message;

The NVA deletes the tunnel connection between the first group member and the other group member.

In an embodiment of the present invention, sending the forwarding entry information to the NVE includes:

If the virtual network does not support multicast forwarding, the NVA obtains the address information of the NVE where the other group members are located, carries the address information of the NVE where the other group members are located in the forwarding table entry information, and sends the forwarded The entry information is forwarded to the NVE, and the entry information instructs the NVE to establish multiple point-to-point tunnel connections with the NVEs connected to the other group members.

In an embodiment of the present invention, the virtual network includes: a virtual stacked network NVO.

In this embodiment, a method for distributing and processing multicast is also provided. FIG. 2 is a flow chart 2 of a method for distributing and processing multicast according to an embodiment of the present invention. As shown in FIG. 2 , the process includes the following steps :

Step S202, the virtual network edge node NVE obtains the join message sent by the first group member in the multicast group connected to the NVE, and the join message includes: the information of the first group member, the information of the multicast group, and the first Virtual network information of the virtual network where the group member is located;

Step S204, the NVE sends the joining message to the virtual network control entity NVA.

Through the above steps, the virtual network edge node NVE obtains the join message sent by the first group member in the multicast group connected to the NVE, and the join message includes: the information of the first group member, the information of the multicast group, and the second For the virtual network information of the virtual network where a group of members belong, the NVE sends the joining message to the virtual network control entity NVA, which solves the problem of limited multicast forwarding capability of the virtual network and improves the multicast forwarding capability of the virtual network.

In an embodiment of the present invention, sending the join message to the virtual network control entity NVA by the NVE includes: sending the join message to the NVA when the join message carries multicast capability information of the virtual network where the NVE is located, wherein , the multicast capability information includes: whether point-to-multipoint multicast tunnels are supported;

After the NVE sends the join message to the virtual network control entity NVA, the NVE receives the forwarding entry information sent by the NVA.

In an embodiment of the present invention, when the virtual network connected to the NVE supports multicast forwarding, the forwarding entry information indicates that the NVE establishes a point-to-multipoint connection with the NVE connected to other members of the multicast group. Tunnel connection, the other group members are members of the multicast group except the first group member; in the case that the virtual network connected to the NVE does not support multicast forwarding, the forwarding entry information indicates that the NVE and the The NVEs connected to other group members establish multiple point-to-point tunnel connections.

In an embodiment of the present invention, after the NVE sends the joining message to the virtual network control entity NVA, the method further includes:

The NVE acquires a leave message, the leave message is a leave message sent by the first group member, and the leave message includes: the information of the first group member, the multicast address information of the leaving multicast group, and the first The virtual network identifier VNID of the virtual network where the group member is located;

The NVE sends the leave message to the NVA, and the leave message is used to instruct the NVA to delete the first group member in the multicast group, and to instruct the NVA to delete the communication between the first group member and the other group members tunnel connection.

FIG. 3 is a structural block diagram 1 of a multicast distribution processing device according to an embodiment of the present invention. As shown in FIG. 3 , the device is located in a virtual network control entity NVA, and the device includes:

The first obtaining module 32 is used to obtain the join message sent by the virtual network edge node NVE, the join message is the join message sent by the first group member in the multicast group connected to the NVE, and the join message includes: the first group Member information, information of the multicast group, and virtual network information of the virtual network where the members of the first group are located;

The multicast module 34 is configured to add the first group member to the multicast group according to the joining message.

Fig. 4 is a structural block diagram 2 of a multicast distribution processing device according to an embodiment of the present invention. As shown in Fig. 4, in addition to the device shown in Fig. 3, the device also includes:

The first sending module 42 is further configured to determine the forwarding entry information according to the multicast capability information of the NVA when the joining message also includes the multicast capability information of the virtual network where the NVE is located, and send the forwarding entry information to the NVE, wherein the multicast capability information includes: whether to support point-to-multipoint multicast tunnels.

In an embodiment of the present invention, when the virtual network supports multicast forwarding, the forwarding entry information indicates that the NVE establishes a point-to-multipoint tunnel connection with the NVE connected to other group members in the multicast group. Other group members are group members other than the first group member in the multicast group; in the case that the virtual network does not support multicast forwarding, the forwarding entry information indicates that the NVE is established with the NVE where the other group members are located. Multiple point-to-point tunnel connections.

In the embodiment of the present invention, the first acquisition module 32 is also used for the NVA to acquire the leave message sent by the NVE after the first group member joins the multicast group according to the join message, and the leave message is the The leaving message sent by the first member of the multicast group connected to the NVE, the leaving message includes: the information of the first group member, the multicast address information of the leaving multicast group, and the virtual address of the first group member The virtual network identifier VNID of the network;

The multicast module 34 is also used to delete the first group member in the multicast group according to the leaving message;

The multicast module 34 is also used for deleting the tunnel connection between the first group member and the other group members.

In the embodiment of the present invention, the first sending module 42 is also used to obtain the address information of the NVE where the other group members are located when the virtual network does not support multicast forwarding, and to obtain the address information of the NVE where the other group members are located. The address information of the NVE is carried in the forwarding entry information, and the forwarding entry information is sent to the NVE, and the forwarding entry information instructs the NVE to establish multiple point-to-point tunnel connections with the NVEs connected to the other group members.

Fig. 5 is a structural block diagram three of a multicast distribution processing device according to an embodiment of the present invention. As shown in Fig. 5, the device also includes:

The second obtaining module 52 is used to obtain the join message sent by the first group member in the multicast group connected by the NVE, and the join message includes: the information of the first group member, the information of the multicast group, and the first Virtual network information of the virtual network where the group member is located;

The second sending module 54 is configured to send the joining message to the virtual network control entity NVA.

FIG. 6 is a fourth structural block diagram of a multicast distribution processing device according to an embodiment of the present invention. As shown in FIG. 6, in addition to the modules shown in FIG. 5, the device also includes: a receiving module 62;

The second sending module 54 is used to send the join message to the NVA when the join message carries the multicast capability information of the virtual network where the NVE is located, wherein the multicast capability information includes: whether to support point-to-multipoint multicast tunnel;

The receiving module 62 is configured to receive the forwarding entry information sent by the NVA after the second sending module 54 sends the join message to the virtual network control entity NVA.

In an embodiment of the present invention, the second obtaining module 52 is configured to obtain a leaving message after the receiving module 62 receives the forwarding entry information sent by the NVA, and the leaving message is a leaving message sent by the first group member, The leaving message includes: the information of the first group member, the multicast address information of the leaving multicast group, and the virtual network identifier VNID of the virtual network where the first group member is located;

The second sending module 54 is configured to send the leave message to the NVA, the leave message is used to instruct the NVA to delete the first group member in the multicast group, and instruct the NVA to delete the first group member and Tunnel connections between members of that other group.

According to another embodiment of the present invention, a multicast distribution processing system is also provided, including: a virtual network control entity NVA and a virtual network edge node NVE;

The NVA obtains the joining message sent by the NVE, the joining message is the joining message sent by the first group member in the multicast group connected to the NVE, and the joining message includes: the information of the first group member, the information of the multicast group information, and the virtual network information of the virtual network where the first group member is located;

The NVA joins the first group member into the multicast group according to the joining message.

The present invention will be described in detail below in combination with preferred embodiments and implementation modes.

In order to improve the multicast forwarding capability of the virtual stacked network and achieve higher management and control capabilities for the entire network resources, the preferred embodiment of the present invention proposes a method for centralized control of multicast packet distribution.

NVE uses Internet Group Management Protocol Snooping (IGMP Snooping for short) to obtain the joining message of the group members it is connected to. The message includes the information of the group members, the multicast address information of the joining group, and its location. The virtual network identifier VNID.

The NVE notifies the NVA of the intercepted group member information. The information notified to the NVA here also includes the multicast capability of the NVE (whether it supports a point-to-multipoint multicast tunnel).

According to the obtained group member information, NVA takes different actions according to the multicast policy of the network (multicast capability obtained from NVE):

1) If the basic network of the overlay network supports multicast forwarding, the NVA sends multicast forwarding information;

2) If the basic network of the stacked network does not support multicast forwarding, the NVA needs to establish a point-to-point tunnel connection between group members for each group member.

The NVE obtains the leaving message of the connected group member through IGMP snooping. The message includes the information of the multicast group to leave, the information of the group member, and the virtual network identifier VNID where the group is located.

The NVE notifies the NVA that a group member is leaving.

The NVA deletes other group members' tunnel connections to that departing group member.

Through the above content, the controller (NVA) can timely perceive the group member information connected to the edge of the network, timely issue the multicast packet flow table and modify the flow table, solve the multicast forwarding problem of the virtual layered network, and improve the packet forwarding performance.

In a preferred embodiment of the present invention, FIG. 7 is a schematic diagram of networking according to a preferred embodiment of the present invention. As shown in FIG. 7, multiple virtual machine devices and multiple physical host devices are connected together through a virtual layered network. Assume that VM1, VM4, and host 7 belong to the same virtual network (different shading indicates that they belong to different virtual networks). At the same time, they belong to the same multicast group. The multicast source is VM1, and the receiver is VM4 and the host 7.

VM4 and host 7 want to join this multicast group, so they will send an IGMP multicast group join message. After the NVE2 and NVE3 they are connected to detect such a message, they will intercept the multicast group joining message and save the member information of the multicast group at the same time.

NVE2 and NVE3 will notify NVA through the interactive protocol VNTP between NVE and NVA that some members will join this multicast group. The notified information includes: the notified message identifier (this is a group member joining message), the multicast address of the multicast group, the address of the host to join, and the network identifier of the virtual network.

When NVA receives such a multicast group join message, it will add the group members to the multicast group, and then send a forwarding entry message to NVE1 connected to the source device VM1 of the group, telling NVE1 to receive When the multicast packet is received, the multicast packet will be encapsulated. Specifically:

If the underlying network of the layered network supports multicast forwarding, a multicast address of the layered network is selected to correspond to the multicast address of the initial packet. Then, a point-to-multipoint tunnel is established at the NVE by sending a mapping message to the NVEs connected to the members of the group, which are tunnels from NVE1 to NVE2 and NVE3 in this embodiment. When the multicast message arrives at NVE1, NVE1 maps the multicast address, encapsulates a corresponding multicast address in the overlay network, and then forwards it through the established point-to-multipoint tunnel.

If the underlying network of the cascade network does not support multicast, NVA needs to obtain the NVE addresses of other members of the group, NVE2 and NVE3 in this example, and then establish a point-to-point tunnel from NVE1 to NVE2, and a point-to-point tunnel from NVE1 to NVE3 tunnel. When the multicast message reaches NVE1, NVE1 will map it into two point-to-point tunnels according to the multicast address of the message, so NVE1 will make two copies of the message and then encapsulate and forward it.

The interaction protocol between NVE and NVA is called virtual reality transport protocols (virtual reality transport protocols, VNTP for short), and FIG. 8 is a schematic diagram of the basic message format of the VNTP protocol according to a preferred embodiment of the present invention.

The message format of this preferred embodiment is as follows:

1. NVE announces multicast packets

Fig. 9 is a schematic diagram of the definition of the NVE announcement multicast message Type field of the preferred embodiment of the present invention, as shown in Fig. 9:

When C/R=1, E/A=1, it means that the message is sent from NVE to NVA:

CMD/RSP=100, indicating that there are multicast members joining (this virtual network supports multicast forwarding);

CMD/RSP=101, indicating that there are multicast members joining (this virtual network does not support multicast, it needs to be copied and forwarded);

CMD/RSP＝011, indicating that a multicast member has left;

Wherein, Fig. 10 is a schematic diagram of the definition of the data field of the NVE announcement multicast message of the preferred embodiment of the present invention, as shown in Fig. 10:

Multicast Address: The multicast address that the group members want to join/leave

Host Address Set: Group member addresses.

2. The reply message from NVA to NVE is used for notification of mapping information

When C/R=1, E/A=0, it means the message sent by NVA to NVE:

CMD/RSP=100, it means that there are multicast members joining, and a point-to-multipoint tunnel is established (this virtual network supports multicast forwarding)

CMD/RSP=101, indicating that there are multicast members joining, and multiple point-to-point tunnels are established (this virtual network does not support multicast, and needs to be copied and thinly forwarded)

CMD/RSP=011 means that there is an NVE that is no longer connected to the members of the group, and the NVE indicated in the data field is not connected to the host address that belongs to the multicast member. Delete the corresponding mapping information.

Fig. 11 is the definition diagram one of the data field of the reply message of NVA to NVE of the preferred embodiment of the present invention, when CMD/RSP=100, as shown in Fig. 11, corresponding data field is as follows:

Multicast Address: Group members want to join the multicast address

Overlay Multicast Address: the multicast address of the overlay network assigned to the multicast address, when CMD/RSP=100, Fig. 12 is the definition schematic diagram 2 of the data field of the reply message from NVA to NVE in the preferred embodiment of the present invention, as shown in Fig. 12, the corresponding data fields are as follows:

NVE Address Set: Each NVE that needs to be sent to the multicast message, that is, point-to-point tunnels between the NVE that receives the message and these NVEs are established.

When CMD/RSP=011, FIG. 13 is a third schematic diagram of the definition of the data field of the reply message from NVA to NVE in the preferred embodiment of the present invention, as shown in FIG. 13 .

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is Better implementation. Based on such an understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products are stored in a storage medium (such as ROM/RAM, disk, CD) contains several instructions to enable a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

It should be noted that each of the above-mentioned modules can be implemented by software or hardware. For the latter, it can be implemented in the following manner, but not limited to this: the above-mentioned modules are all located in the same processor; or, the above-mentioned modules are respectively located in multiple in the processor.

The embodiment of the invention also provides a storage medium. Optionally, in this embodiment, the above-mentioned storage medium may be configured to store program codes for performing the following steps:

S1, the virtual network control entity NVA obtains the joining message sent by the virtual network edge node NVE, the joining message is the joining message sent by the first group member in the multicast group connected to the NVE, and the joining message includes: the first group member information, the multicast address information of the multicast group, and the virtual network identifier VNID of the virtual network where the first group member is located;

S2, the NVA adds the first group member to the multicast group according to the join message;

S3, the NVA acquires the multicast capability of the virtual network where the NVE is located, determines the forwarding entry information according to the multicast capability, and sends the forwarding entry information to the NVE, wherein, in the case that the virtual network supports multicast forwarding , the forwarding entry information indicates that the NVE establishes a point-to-multipoint tunnel connection with the NVE connected to other group members in the multicast group, and the other group members are group members in the multicast group other than the first group member ; In the case that the virtual network does not support multicast forwarding, the forwarding entry information indicates that the NVE establishes multiple point-to-point tunnel connections with the NVE where the other group members are located.

Optionally, the storage medium is also configured to store program codes for executing the method steps of the foregoing embodiments:

Optionally, in this embodiment, the above-mentioned storage medium may include but not limited to: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk Various media that can store program codes such as discs or optical discs.

Optionally, in this embodiment, the processor executes the method steps of the foregoing embodiments according to the program code stored in the storage medium.

Optionally, for specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and optional implementation manners, and details are not repeated in this embodiment.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (19)

1. A method for distributing and processing multicast, comprising: The virtual network control entity NVA obtains the joining message sent by the virtual network edge node NVE, the joining message is the joining message sent by the first group member in the multicast group connected to the NVE, and the joining message includes: the first Information about group members, information about the multicast group, and virtual network information of the virtual network where the first group member is located; The NVA joins the first group member to the multicast group according to the join message. 2. The method according to claim 1, wherein, after the NVA joins the first group member into the multicast group according to the joining message, the steps include: In the case where the joining message further includes the multicast capability information of the virtual network where the NVE is located, The NVA determines forwarding entry information according to the multicast capability information, and sends the forwarding entry information to the NVE, wherein the multicast capability information includes: whether point-to-multipoint multicast tunnels are supported. 3. The method of claim 2, wherein, In the case where the virtual network supports multicast forwarding, the forwarding entry information indicates that the NVE that is connected to other group members in the multicast group establishes a point-to-multipoint tunnel connection, and the other group members It is a member of the multicast group except the first member; in the case that the virtual network does not support multicast forwarding, the forwarding entry information indicates that the NVE and the other group members are located The NVE establishes multiple point-to-point tunnel connections. 4. The method according to claim 1, wherein, after the NVA joins the first group member into the multicast group according to the joining message, the method further comprises: The NVA acquires the leave message sent by the NVE, the leave message is a leave message sent by the first group member in the multicast group connected to the NVE, and the leave message includes: information of the first group member , the multicast address information of the leaving multicast group, and the virtual network identifier VNID of the virtual network where the first group member is located; The NVA deletes the first group member from the multicast group according to the leave message; The NVA deletes tunnel connections between the first group member and other group members, and the other group members are group members in the multicast group except the first group member. 5. The method according to claim 2, wherein sending forwarding entry information to the NVE comprises: In the case that the virtual network does not support multicast forwarding, the NVA obtains the address information of the NVE where other group members are located, and the other group members are groups other than the first group member in the multicast group The member carries the address information of the NVE where the other group members are located in the forwarding entry information, and sends the forwarding entry information to the NVE, and the forwarding entry information indicates that the NVE and the other group members The NVEs connected by members establish multiple point-to-point tunnel connections. 6. The method according to any one of claims 1 to 5, wherein the virtual network comprises: a virtual stacked network (NVO). 7. A method for distributing and processing multicast, comprising: The virtual network edge node NVE obtains the joining message sent by the first group member in the multicast group connected to the NVE, and the joining message includes: information of the first group member, information of the multicast group, and the Virtual network information of the virtual network where the members of the first group belong; The NVE sends the joining message to the virtual network control entity NVA. 8. The method of claim 7, wherein, The NVE sending the join message to the virtual network control entity NVA includes: sending the join message to the NVA when the join message carries multicast capability information of the virtual network where the NVE is located, wherein the Multicast capability information includes: whether to support point-to-multipoint multicast tunnels; After the NVE sends the joining message to the virtual network control entity NVA, the NVE receives the forwarding entry information sent by the NVA. 9. The method of claim 8, wherein In the case that the virtual network connected to the NVE supports multicast forwarding, the forwarding entry information indicates that the NVE establishes a point-to-multipoint tunnel connection with the NVE connected to other group members connected to the multicast group, so The other group members are group members other than the first group member in the multicast group; when the virtual network connected to the NVE does not support multicast forwarding, the forwarding entry information indicates that the NVE Establishing multiple point-to-point tunnel connections with the NVEs connected to the other group members. 10. The method according to claim 7, wherein after the NVE sends the join message to the virtual network control entity NVA, the method further comprises: The NVE acquires a leaving message, the leaving message is a leaving message sent by the first group member, and the leaving message includes: information of the first group member, the multicast address of the leaving multicast group information, and the virtual network identifier VNID of the virtual network where the first group member is located; The NVE sends the leave message to the NVA, the leave message is used to instruct the NVA to delete the first group member from the multicast group, and instruct the NVA to delete the first group A tunnel connection between the member and other group members, where the other group members are group members in the multicast group other than the first group member. 11. A multicast distribution processing device located in a virtual network control entity NVA, characterized in that it comprises: The first obtaining module is used to obtain the join message sent by the virtual network edge node NVE, the join message is the join message sent by the first group member in the multicast group connected to the NVE, and the join message includes: the The information of the first group member, the information of the multicast group, and the virtual network information of the virtual network where the first group member is located; A multicast module, configured to add the first group member to the multicast group according to the join message. 12. The device according to claim 11, further comprising: The first sending module is further configured to, in the case that the join message further includes multicast capability information of the virtual network where the NVE is located, the NVA determines forwarding entry information according to the multicast capability information, and sends the The forwarding entry information is sent to the NVE, wherein the multicast capability information includes: whether point-to-multipoint multicast tunnel is supported. 13. The device of claim 12, wherein: In the case where the virtual network supports multicast forwarding, the forwarding entry information indicates that the NVE that is connected to other group members in the multicast group establishes a point-to-multipoint tunnel connection, and the other group members It is a member of the multicast group except the first member; in the case that the virtual network does not support multicast forwarding, the forwarding entry information indicates that the NVE and the other group members are located The NVE establishes multiple point-to-point tunnel connections. 14. The apparatus of claim 11, wherein: The first obtaining module is also used for the NVA to obtain the leave message sent by the NVE after the NVA joins the first group member to the multicast group according to the join message, and the leave message is the NVE A leave message sent by the first group member in the connected multicast group, the leave message includes: the information of the first group member, the multicast address information of the leaving multicast group, and the first group The virtual network identifier VNID of the virtual network where the member is located; The multicast module is further configured to delete the first group member from the multicast group according to the leave message; The multicast module is also used to delete the tunnel connection between the first group member and other group members, and the other group members are group members in the multicast group except the first group member. 15. The apparatus of claim 12, wherein: The first sending module is further configured to obtain the address information of the NVE where other group members are located when the virtual network does not support multicast forwarding, and the other group members are members of the multicast group except the Members other than the first group member carry the address information of the NVE where the other group members are located in the forwarding entry information, and send the forwarding entry information to the NVE, and the forwarding entry information indicates the The above NVE establishes multiple point-to-point tunnel connections with the NVEs connected to other group members. 16. A multicast distribution processing device, characterized in that it is located at a virtual network edge node NVE, comprising: The second acquiring module is configured to acquire a join message sent by a first group member in the multicast group connected to the NVE, where the join message includes: information about the first group member, information about the multicast group, and virtual network information of the virtual network where the members of the first group belong; The second sending module is configured to send the joining message to the virtual network control entity NVA. 17. The device according to claim 16, further comprising: a receiving module; The second sending module is configured to send the join message to the NVA when the join message carries multicast capability information of the virtual network where the NVE is located, wherein the multicast capability information includes: whether to support Point-to-multipoint multicast tunnel; The receiving module is configured to receive the forwarding entry information sent by the NVA after the second sending module sends the join message to the virtual network control entity NVA. 18. The apparatus of claim 17, wherein: The second obtaining module is configured to obtain, after the receiving module receives the forwarding entry information sent by the NVA, a leaving message, where the leaving message is a leaving message sent by a member of the first group, and in the leaving message Including: the information of the first group member, the multicast address information of the leaving multicast group, and the virtual network identifier VNID of the virtual network where the first group member is located; The second sending module is configured to send the leave message to the NVA, the leave message is used to instruct the NVA to delete the first group member from the multicast group, and instruct the NVA Deleting tunnel connections between the first group member and other group members, where the other group members are group members in the multicast group other than the first group member. 19. A multicast distribution processing system, comprising: a virtual network control entity NVA and a virtual network edge node NVE; The NVA acquires a join message sent by the NVE, the join message is a join message sent by the first group member in the multicast group connected to the NVE, and the join message includes: information of the first group member , the information of the multicast group, and the virtual network information of the virtual network where the members of the first group are located; The NVA joins the first group member to the multicast group according to the join message.