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Method, system and router for notifying border gateway protocol (BGP) neighbors
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A router, advertisement technology
Inactive Publication Date: 2009-12-23
HUAWEI TECH CO LTD
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[0006] The embodiment of the present invention provides a method, system and router for BGP neighbor notification to solve the problems of service interruption and route oscillation during Peer Session
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Embodiment 1
[0038] (1) A Peer Session connection is established between Router A and Router B, and the multicast capability is enabled.
[0039](2) Router A sends a Notification Message to Router B, and the Notification Message carries the multicast capability of Router A.
[0040] (3) Router B receives the Notification Message sent by Router A, and parses the Notification Message to learn the ability of Router A to enable multicast.
[0041] (4) If the IPv4 multicast capability is also enabled on Router B, then Router B learns that the multicast capability negotiation between Router B and Router A is successful, and at the same time sends a Notification Message to Router A, the Notification Message carries the multicast enabled on Router B ability.
[0042] (5) Router A receives the Notification Message from Router B that carries the multicast capability of Router B, and Router A learns that Router A and Router B have successfully negotiated the multicast capability.
[0043] In this w...
Embodiment 2
[0045] (1) A Peer Session connection is established between Router A and Router B, and the multicast capability is enabled on Router A.
[0046] (3) Router A extends the Notification Message so that the Notification Message carries the soft notification message, and Router A sends the Notification Message carrying the soft notification message to Router B.
[0047] (4) After receiving the Notification Message, Router B parses the Notification Message, obtains the Soft Notification message carried by the Notification Message, learns that Router A has the soft notification capability, and triggers resending of the local route.
[0048] In this way, soft notification is realized, which can effectively reduce the error handling of disconnecting the Peer Session in the past, and ensure the smoothness of the forwarding layer.
[0049] Correspondingly, the embodiment of the present invention also provides a BGP neighbor notification system, such as image 3 As shown, the system incl...
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Abstract
The embodiment of the invention provides a method, a system and a router for notifying border gateway protocol (BGP) neighbors, belonging to the field of communications. The method for notifying border gateway protocol (BGP) neighbors comprises the following steps: establishing peer connection with an adjacent router; acquiring the notification message of the adjacent router, wherein the notification message comprises the capability message and / or the soft-notification message of the adjacent router; carrying out BGP notification processing with the adjacent router according to the capability message and / or the soft-notification message, therefore, the dynamic capability negotiation of peers is realized, the peer session is not interrupted, and under the condition that the capability of the router at the same peer session is changed, other ongoing services can not be destroyed.
Description
technical field [0001] The invention relates to the communication field, in particular to a method, system and router for BGP neighbor notification. Background technique [0002] BGP (Border Gateway Protocol, Border Gateway Protocol) is a dynamic routing protocol used between AS (Autonomous System, Autonomous System). A router that sends BGP messages is called a BGP speaker. It receives or generates new routing information and advertises it to other BGP speakers. BGP speakers that exchange messages with each other are called peers (Peer). BGP uses TCP as its transport layer protocol. The Open message (open message) is used to establish the connection relationship between BGP peers (ie: peer service, Peer Session), and negotiates various capabilities when the PeerSession is initially established, such as Address family capability, Refresh capability, GR (Graceful Restart, smooth restart) capability, etc. When BGP detects an error state, BGP sends a Notification message (no...
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