Method for establishing route by linking routing information protocol with bidirectional forwarding detection and equipment

Abstract

The invention discloses a method for establishing a route by linking routing information protocol (RIP) with bidirectional forwarding detection (BFD) and equipment. The method comprises the following steps that: first equipment receives a first RIP response message transmitted by second equipment, adds the second equipment as an RIP neighbor, establishes BFD session with the second equipment, requests the route of the second equipment if the session is successfully established, and adds the route of the second equipment into a routing table; the first equipment receives an RIP response message subsequently transmitted by the second equipment and updates the route of the second equipment in the routing table by using the route in the message; and the first equipment finds BFD session Down with the second equipment, deletes the second equipment from the RIP neighbor and meanwhile deletes the route of the second equipment from the route table. By adopting the method and the equipment, the phenomenon that RIP route cannot be deleted or oscillated in case of single-pass of a link can be avoided.

Description

technical field [0001] The present invention relates to the technical field of routing, in particular to a routing information protocol (RIP, Routing Information Protocol)-linked bidirectional forwarding detection (BFD, Bidirectional Forwarding Detection)-linked method and device for establishing a route. Background technique [0002] RIP is a distance vector routing protocol. Its biggest advantages are simple configuration, easy management and operation, and it is mainly used in small-scale networks. RIP was born earlier and has become a mature routing protocol after years of application. It is widely used in the Internet, especially in some small and medium-sized networks, such as campus networks and regional networks with relatively simple structures. For more complex environments and large networks, RIP is generally not used. [0003] RIP is based on User Datagram Protocol (UDP, User Datagram Protocol). RIP packets are encapsulated in UDP packets. A router configured wi...

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Problems solved by technology

[0035] In addition, if the RIP module is notified to delete the route only when the BFD session transitions from Up to Down, then when the link has been in a single-way fault from the beginning, the BFD session status cannot be transitioned from Down to Up. There will be no situation where the BFD session switches from UP to DOWN. However, the RIP module will still learn the route of the peer router at this time, so the phenomenon that the RIP module cannot delete the route will appear.

[0036] It can be seen that when RIP and BFD are linked, if the link is single-pass, the RIP module can still learn the route, but there will be situations where the route keeps flapping or the route cannot be deleted, so even if there is a backup link in the network, the route cannot be switched To the backup link, the route cannot be converged, and the routing switch of the backup link can only be completed through human intervention control

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