CN106656821B - Method and device for network equipment to access network - Google Patents
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Abstract
The embodiment of the invention discloses a method and a device for accessing network equipment to a network, which are applied to the network equipment, and the method comprises the following steps: when a network device establishes a neighbor with an opposite terminal network device, receiving a first LSA sent by the opposite terminal network device; the first LSA includes: a network type of a first interface of the peer network device; the first interface is connected with a second interface of the network equipment; when the network type of the first interface is different from the network type of the second interface carried in the local second LSA, modifying the network type of the second interface carried in the second LSA into the network type of the first interface, and calculating a route; and flooding the modified second LSA, so that the opposite-end network equipment calculates the route based on the modified second LSA. By applying the embodiment of the invention, under the condition that the neighbors are established between two network devices but the network types of the interfaces of the two network devices are different, the new network device is ensured to be accessed into the network.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for a network device to access a network.
Background
OSPF (Open Shortest Path First) is an interior gateway protocol based on a link state, and performs routing calculation using an SPF (Shortest Path First) algorithm. OSPF divides the network into 4 interface network types according to the link layer protocol of interface package, which are: broadcast, NBMA (Non-Broadcast Multi-Access), P2MP (Point-to-MultiPoint), and P2P (Point-to-Point).
In general, when a new network device (a device not accessing a network) needs to access the network, if the network type of an interface of the new network device is different from that of an original network device (a device already accessing the network), an OSPF neighbor is not established with the original network device, and the new network device cannot access the network; however, in some special cases, if the network type of the interface of the new network device is P2P, and the network type of the interface of the original network device is Broadcast, the new network device and the original network device may establish an OSPF neighbor, but the network types of the interfaces of the two network devices are different, and the new network device and the original network device cannot calculate a route according to information stored in a LSDB (Link State DataBase), and thus the new network device cannot access the network.
Disclosure of Invention
The embodiment of the invention discloses a method and a device for accessing network equipment into a network, which are used for ensuring that new network equipment is accessed into the network under the condition that neighbors are established between two pieces of network equipment but the network types of interfaces of the two pieces of network equipment are different.
In order to achieve the above object, an embodiment of the present invention discloses a method for a network device to access a network, which is applied to the network device, and the method includes:
when the network device establishes a neighbor with an opposite-end network device, receiving a first LSA (Link State Advertisement) sent by the opposite-end network device; wherein the first LSA includes: the network type of a first interface of the opposite terminal network equipment, and the first interface is connected with a second interface of the network equipment;
when the network type of the first interface is different from the network type of the second interface carried in a local second LSA, modifying the network type of the second interface carried in the second LSA into the network type of the first interface, and calculating a route;
and flooding the modified second LSA so that the opposite-end network equipment calculates the route based on the modified second LSA.
In order to achieve the above object, an embodiment of the present invention further discloses a device for accessing a network device to a network, which is applied to the network device, and the device includes:
a receiving unit, configured to receive a first LSA sent by an opposite-end network device when the network device establishes a neighbor with the opposite-end network device; wherein the first LSA includes: the network type of a first interface of the opposite terminal network equipment, and the first interface is connected with a second interface of the network equipment;
a calculating unit, configured to modify the network type of the second interface carried in a local second LSA into the network type of the first interface and calculate a route when the network type of the first interface is different from the network type of the second interface carried in the local second LSA;
and the flooding unit is used for flooding the modified second LSA so that the opposite-end network equipment calculates the route based on the modified second LSA.
In the embodiment of the present invention, after a network device establishes an adjacency with an opposite terminal network device, a first LSA sent by the opposite terminal network device is received, when a network type of a first interface carried in the first LSA is different from a network type of a second interface carried in a local second LSA, the network type of the second interface carried in the second LSA is modified into the network type of the first interface, and a route is calculated; and flooding the modified second LSA, and the opposite-end network device can calculate the route based on the modified second LSA. Therefore, under the condition that the neighbors are established between two network devices but the network types of the interfaces of the two network devices are different, the network devices and the opposite network devices of the network devices calculate the routes, and the new network devices are ensured to be accessed to the network.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating a method for a network device to access a network according to an embodiment of the present invention;
fig. 2 is a signaling diagram of a network device accessing a network according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an apparatus for accessing a network device to a network according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be described in detail below with reference to specific examples.
Referring to fig. 1, fig. 1 is a schematic flowchart of a method for a network device to access a network according to an embodiment of the present invention, and is applied to the network device. Here, the network device may be understood as a new network device, which is a device that does not access the network but needs to access the network.
Specifically, the method may include:
s101: when a network device establishes a neighbor with an opposite terminal network device, receiving a first LSA sent by the opposite terminal network device; wherein the first LSA includes: the network type of a first interface of the opposite terminal network equipment, and the first interface is connected with a second interface of the network equipment;
here, the peer network device may be an original network device, that is, a device that has accessed a network, or may be a new network device.
After the first interface of the opposite terminal network device is connected with the second interface of the network device, the opposite terminal network device establishes a neighbor with the network device, and at this time, the opposite terminal network device and the network device are mutually neighbor devices.
S102: when the network type of the first interface is different from the network type of the second interface carried in a local second LSA, modifying the network type of the second interface carried in the second LSA into the network type of the first interface, and calculating a route;
here, the second LSA is an LSA of the network device itself, and after the network device establishes a neighbor with the opposite-end network device, the network device receives the first LSA sent by the opposite-end network device, and sends the second LSA to other neighbor devices.
In general, a network device may establish a neighbor with a plurality of peer network devices, that is, the network device may have a plurality of neighbor devices, each neighbor device may send an LSA to the network device, because the neighbor devices are all in the same network, and the network type of an interface carried in the LSA sent by each neighbor device is the same, in order to quickly calculate a correct route, the network device may use the first received LSA as a first LSA, and according to the first LSA, detect whether the network type of the first interface carried in the first LSA is the same as the network type of a second interface carried in a local second LSA.
In an embodiment of the present invention, if the network type of the first interface carried in the first LSA is the same as the network type of the second interface carried in the second LSA, it may be determined that the network types of the interfaces of the network device and the opposite-end network device are the same, and the network device synchronizes the received first LSA to the local LSDB, and further calculates a route according to the information stored in the LSDB;
if the network type of the first interface carried in the first LSA is different from the network type of the second interface carried in the second LSA, it may be determined that the network types of the interfaces of the network device and the opposite-end network device are different, and even if the first LSA is synchronized into the local LSDB, the route cannot be calculated according to the information stored in the LSDB.
S103: and flooding the modified second LSA so that the opposite-end network equipment calculates the route based on the modified second LSA.
If the network device needs to access the network, not only the network device needs to calculate the route, but also the neighbor device of the network device in the network, that is, the opposite-end network device of the network device also needs to calculate the route for the network device. However, when the network types of the interfaces of the network device and the opposite-end network device are different, the opposite-end network device cannot calculate the route. In this case, in order to ensure that the peer network device calculates the route, after the network device modifies the network type of the second interface carried in the second LSA, the modified second LSA is flooded, so that the network type of the interface carried in the second LSA received by the peer network device is the same as the network type of the interface carried in the first LSA in the peer network device, and the peer network device may calculate the route based on the modified second LSA. At this time, the network device and the opposite-end network device calculate the correct route, and the network device is ensured to be accessed to the network.
In an embodiment of the present invention, before the modified second LSA is flooded by the network device, the opposite-end network device has received the second LSA flooded by the network device, and if the network device floods the modified second LSA again, the opposite-end network device may store a plurality of second LSAs, which may cause problems such as a wrong route calculated by the opposite-end network device or a failure to calculate the route. In order to avoid the above problem, after the network device receives the first LSA sent by the peer network device, if it is determined that the network type of the first interface carried in the first LSA is different from the network type of the second interface carried in the second LSA, the network device may send an aging message to all neighbor devices of the network device, that is, send an aging message to the peer network device, and age the second LSA stored in all the neighbor devices. Here, the aging message may be a MAXAGE LSA.
After receiving the aging message, the opposite-end network device ages the second LSA stored locally, that is, the second LSA stored locally and before modification is aged.
In this case, the opposite-end network device receives the modified second LSA again, and no other second LSA exists locally, so that the problems of calculating a wrong route or being incapable of calculating a route and the like are avoided.
Modifying the network type of the interface carried in the second LSA may ensure that the network device accesses the network, but this state is unstable. For example, in the OPFS network, when the LSA aging time reaches 1800s and OSPF updates the LSA again, the network type of the interface carried in the second LSA will not be modified again, so that the network type of the interface of the network device is different from the network type of the interface of the opposite-end network device, and the network device cannot access the network. In order to ensure that the network device can stably access the network, prompt information used for prompting the modification of the network type of the interface can be generated and output. Generally, the prompt message may be LOG message, and the prompt message may include: the network type of the interface carried in the modified second LSA, that is, the network type of the first interface.
In this case, outputting the prompt may prompt the user to: the network type of the interface of the network equipment is different from that of the adjacent equipment; in addition, the network type of the first interface is output, and the user is informed to: the network type of the interface of the neighbor device is the network type of the first interface, so that a user can modify the network type of the interface configured in the network device according to the network type of the first interface, and the network device can be ensured to be stably accessed into the network.
In an embodiment of the present invention, the network type of the first interface may be a P2P network type, and the network type of the second interface may be a Broadcast network type; or the like, or, alternatively,
the network type of the first interface may be a Broadcast network type, and the network type of the second interface may be a P2P network type.
Referring to fig. 2, a process of accessing a network device to a network is described in detail below with reference to an example of an OPFS network, where in fig. 2, the network device 100 is a new network device, a network type of a second interface of the network device 100 is Broadcast, a Router-ID is 2.2.2.2, and an IP of the second interface is 12.1.1.2; the network type of the first interface of the peer network device 200 is P2P, the Router-ID is 1.1.1.1, and the IP of the first interface is 12.1.1.1. The first interface is connected with the second interface, and an OSPF neighbor is established between the network device 100 and the opposite terminal network device 200;
1. the network device 100 sends LSAs to all neighbor devices (including the peer network device 200 and other neighbor devices 300) mutually, that is, the network device 100 sends a second LSA to all neighbor devices, and all neighbor devices send LSAs to the network device 100; assume that the first LSA received by the network device 100 for the first time is an LSA sent by the peer network device 200;
here, the content of the first LSA may be:
Type :Router
LS ID :1.1.1.1
Adv Rtr :1.1.1.1
LS Age :23
Len :48
Options :O E
Seq# :80000002
Checksum :0x389c
Link Count :2
Link ID :2.2.2.2
Data :12.1.1.1
link Type P-2-P// network Type of first interface
Metric :1
Link ID :12.1.1.0
Data :255.255.255.0
Link Type :StubNet
Metric :1
The contents of the second LSA may be:
Type :Router
LS ID :2.2.2.2
Adv Rtr :2.2.2.2
LS Age :22
Len :48
Options :O E
Seq# :80000002
Checksum :0xd7f7
Link Count :2
Link ID :1.1.1.1
Data :12.1.1.2
b-r-o-a-d-c-a-s-t// network Type of second interface
Metric :1
Link ID :12.1.1.0
Data :255.255.255.0
Link Type :StubNet
Metric :1
2. Comparing the network types of the interfaces carried in the first LSA and the second LSA, the network device 100 may determine that the network types of the interfaces of the network device 100 and the opposite-end network device 200 are different, and at this time, the network device 100 may send a second LSA of a mage, that is, an aging message to all the neighboring devices;
3. all the neighbor devices age the second LSA stored locally and currently according to the second LSA of the MAXAGE, namely, the network type of an aging interface is the original second LSA of the Broadcast;
4. the network device 100 reconstructs a second LSA according to the network type of the first interface carried in the first LSA, that is, modifies the network type of the second interface carried in the second LSA into the network type of the first interface, that is, the modified second LSA may have:
Type :Router
LS ID :2.2.2.2
Adv Rtr :2.2.2.2
LS Age :22
Len :48
Options :O E
Seq# :80000002
Checksum :0xd7f7
Link Count :2
Link ID :1.1.1.1
Data :12.1.1.2
link Type P-2-P// network Type of first interface
Metric :1
Link ID :12.1.1.0
Data :255.255.255.0
Link Type :StubNet
Metric :1
5. The network device 100 sends the modified second LSA to all the neighbor devices;
in this case, the network device 100 and all the neighboring devices of the network device 100 can calculate the correct route, and the network device 100 can successfully access the network.
6. The network device 100 prints LOG information, that is, generates and outputs prompt information, which includes the network type P2P of the first interface.
In this case, the user can be prompted by LOG information: the network device 100 has a different network type from the interface of the peer network device 200; in addition, the user may modify the network type of the interface configured locally by the network device 100 to be P2P according to P2P included in the LOG information, thereby ensuring that the network device 100 can stably access the network.
By applying the embodiment, after the network device establishes the neighborhood with the opposite terminal network device, receiving a first LSA sent by the opposite terminal network device, modifying the network type of the second interface carried in the second LSA into the network type of the first interface when the network type of the first interface carried in the first LSA is different from the network type of the second interface carried in the local second LSA, and calculating the route; and flooding the modified second LSA, and the opposite-end network device can calculate the route based on the modified second LSA. Therefore, under the condition that the neighbors are established between two network devices but the network types of the interfaces of the two network devices are different, the network devices and the opposite network devices of the network devices calculate the routes, and the new network devices are ensured to be accessed to the network.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an apparatus for a network device to access a network according to an embodiment of the present invention, and the apparatus is applied to the network device, and includes:
a receiving unit 301, configured to receive a first link state advertisement LSA sent by an opposite-end network device when the network device establishes a neighbor with the opposite-end network device; wherein the first LSA includes: the network type of a first interface of the opposite terminal network equipment, and the first interface is connected with a second interface of the network equipment;
a calculating unit 302, configured to modify the network type of the second interface carried in a local second LSA into the network type of the first interface and calculate a route when the network type of the first interface is different from the network type of the second interface carried in the local second LSA;
a flooding unit 303, configured to flood the modified second LSA, so that the peer network device calculates a route based on the modified second LSA.
In an embodiment of the present invention, the calculating unit 302 may specifically be configured to:
synchronizing the first LSA into a local Link State Database (LSDB);
a route is calculated based on information stored in the LSDB.
In one embodiment of the present invention, the apparatus may further include:
a sending unit (not shown in fig. 3), configured to send an aging message to all neighbor devices of the network device after receiving the first LSA sent by the peer network device and when the network type of the first interface is different from the network type of the second interface carried in the second LSA, so as to age the second LSA stored in all the neighbor devices.
In one embodiment of the present invention, the apparatus may further include:
an output unit (not shown in fig. 3), configured to generate and output a hint information after the network type of the second interface carried in the second LSA is modified to the network type of the first interface, where the hint information is used to hint the modification of the network type of the interface.
In an embodiment of the present invention, the network type of the first interface may be a point-to-point P2P network type, and the network type of the second interface may be a Broadcast network type; or the like, or, alternatively,
the network type of the first interface may be a Broadcast network type, and the network type of the second interface may be a P2P network type.
By applying the embodiment, after the network device establishes the neighborhood with the opposite terminal network device, receiving a first LSA sent by the opposite terminal network device, modifying the network type of the second interface carried in the second LSA into the network type of the first interface when the network type of the first interface carried in the first LSA is different from the network type of the second interface carried in the local second LSA, and calculating the route; and flooding the modified second LSA, and the opposite-end network device can calculate the route based on the modified second LSA. Therefore, under the condition that the neighbors are established between two network devices but the network types of the interfaces of the two network devices are different, the network devices and the opposite network devices of the network devices calculate the routes, and the new network devices are ensured to be accessed to the network.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Those skilled in the art will appreciate that all or part of the steps in the above method embodiments may be implemented by a program to instruct relevant hardware to perform the steps, and the program may be stored in a computer-readable storage medium, which is referred to herein as a storage medium, such as: ROM/RAM, magnetic disk, optical disk, etc.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A method for a network device to access a network is applied to the network device which is not accessed to the network but needs to be accessed to the network, and the method comprises the following steps:
when the network equipment establishes a neighbor with opposite terminal network equipment, receiving a first Link State Advertisement (LSA) sent by the opposite terminal network equipment, and sending a second LSA of the network equipment to other neighbor equipment; wherein the first LSA includes: the network type of a first interface of the opposite-end network equipment is connected with a second interface of the network equipment, and the opposite-end network equipment is equipment which has access to a network;
when the network type of the first interface is different from the network type of the second interface carried in a local second LSA, modifying the network type of the second interface carried in the second LSA into the network type of the first interface, and calculating a route;
flooding the modified second LSA so that the opposite-end network equipment calculates the route based on the modified second LSA;
after receiving the first LSA sent by the peer network device, the method further includes:
and when the network type of the first interface is different from the network type of the second interface carried in the second LSA, sending an aging message to all the neighbor devices of the network device so as to age the second LSA stored in all the neighbor devices.
2. The method of claim 1, wherein the computing the route comprises:
synchronizing the first LSA into a local Link State Database (LSDB);
a route is calculated based on information stored in the LSDB.
3. The method of claim 1, wherein after modifying the network type of the second interface carried in the second LSA to the network type of the first interface, the method further comprises:
and generating and outputting prompt information, wherein the prompt information is used for prompting the modification of the network type of the interface.
4. The method according to claim 1, wherein the network type of the first interface is a point-to-point P2P network type, and the network type of the second interface is a Broadcast network type; or the like, or, alternatively,
the network type of the first interface is a Broadcast network type, and the network type of the second interface is a P2P network type.
5. An apparatus for a network device to access a network, the apparatus being applied to a network device that is not accessed to the network but needs to access the network, the apparatus comprising:
a receiving unit, configured to receive a first Link State Advertisement (LSA) sent by an opposite-end network device when the network device establishes a neighbor with the opposite-end network device, and send a second LSA of the network device to other neighbor devices; wherein the first LSA includes: the network type of a first interface of the opposite-end network equipment is connected with a second interface of the network equipment, and the opposite-end network equipment is equipment which has access to a network;
a calculating unit, configured to modify the network type of the second interface carried in a local second LSA into the network type of the first interface and calculate a route when the network type of the first interface is different from the network type of the second interface carried in the local second LSA;
a flooding unit, configured to flood the modified second LSA, so that the peer network device calculates a route based on the modified second LSA;
wherein the apparatus further comprises:
a sending unit, configured to send an aging message to all neighbor devices of the network device after receiving the first LSA sent by the peer network device and when the network type of the first interface is different from the network type of the second interface carried in the second LSA, so as to age the second LSAs stored in all the neighbor devices.
6. The apparatus according to claim 5, wherein the computing unit is specifically configured to:
synchronizing the first LSA into a local Link State Database (LSDB);
a route is calculated based on information stored in the LSDB.
7. The apparatus of claim 5, further comprising:
and the output unit is used for generating and outputting prompt information after the network type of the second interface carried in the second LSA is modified into the network type of the first interface, wherein the prompt information is used for prompting the modification of the network type of the interface.
8. The apparatus of claim 5, wherein the network type of the first interface is a point-to-point P2P network type, and the network type of the second interface is a Broadcast network type; or the like, or, alternatively,
the network type of the first interface is a Broadcast network type, and the network type of the second interface is a P2P network type.
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| CN101102325A (en) * | 2006-11-09 | 2008-01-09 | 华为技术有限公司 | Method and device for notifying boundary connection information of autonomous system |
| CN101252488A (en) * | 2008-04-15 | 2008-08-27 | 中国科学院计算技术研究所 | A multi-autonomous system router level topology processing system and method |
| CN101771615A (en) * | 2010-01-26 | 2010-07-07 | 华为技术有限公司 | Neighborhood relationship building method, communication equipment and system thereof |
| CN101902391A (en) * | 2010-03-15 | 2010-12-01 | 杭州华三通信技术有限公司 | Intelligent static route based method and equipment for forwarding messages |
| CN102025552A (en) * | 2011-01-12 | 2011-04-20 | 杭州华三通信技术有限公司 | Backup method and backup device of link-state advertisement |
| CN102281194A (en) * | 2011-08-01 | 2011-12-14 | 华为技术有限公司 | Message transmission method and network equipment |
| CN104396199A (en) * | 2012-06-21 | 2015-03-04 | 瑞典爱立信有限公司 | Adaptive MTU size optimization using IGP |
| CN103780498A (en) * | 2014-01-27 | 2014-05-07 | 杭州华三通信技术有限公司 | LSA synchronizing method and device |
| CN103825760A (en) * | 2014-02-25 | 2014-05-28 | 杭州华三通信技术有限公司 | Method and device for setting up neighborhood on basis of OSPF protocol |
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