Method and equipment for quickly determining OSPF (Open Shortest Path First) interface role

Abstract

The invention discloses a method and equipment for quickly determining an OSPF (Open Shortest Path First) interface role. The method comprises the following step: when an OSPF interface is in Waiting state, network equipment triggers a Best Priority event, transfers an OSPF interface state from the Waiting state to a DR (Designated Router) state or a BDR (Backup Designated Router) state and sends a HELLO message which carries DR or BDR information to other network equipment. In the invention, time overhead for a neighbor establishing process is saved, and longer dead timer time is allowed to be configured.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method and equipment for quickly determining the role of an OSPF interface. Background technique [0002] OSPF (Open Shortest Path First, Open Shortest Path First) belongs to IGP (Interior Gateway Protocol, Interior Gateway Protocol), which is used to discover routes inside the autonomous system, and OSPF is a dynamic routing protocol based on link state. By using SPF ( Shortest Path First, the shortest path first) algorithm for route calculation. [0003] Such as figure 1 The shown is a schematic diagram of a network in which the entire autonomous system is divided into several areas (such as Area1, Area2, etc.). Broadcast its own link state through the Flooding (flooding) algorithm, so that a synchronized link state database is maintained in the entire area. According to the link state database, the router can calculate the shortest path with itself as the root and ot...

AI Technical Summary

Problems solved by technology

[0011] To sum up, when the interface state transition state machine is in the Waiting state and needs to wait for the dead timer to expire before transitioning from the Waiting state, before the dead timer expires, the HELLO message carrying the BDR or DR information is not received. Therefore, the state of the neighbor state transformation state machine cannot be migrated from the 2-Way state to the ExStart state, and then the LSA (Link State Advertisement, link state broadcast) interaction cannot be performed, and the required link state information cannot be exchanged between the routers. Processes such as route calculation cannot be performed

[0012] In this case, all neighbor state transition state machines in the network need to wait for a dead timer to complete the state transition to the ExStart state, that is, they need to wait for the dead timer to expire before starting information exchange and routing calculation, which affects use of the internet

[0013] Furthermore, since the dead timer can be set, if the dead timer time is set very large (in order to reduce the CPU burden or improve bandwidth utilization, the maximum value is 68 years), it may cause the neighbor to be unable to establish for a long time, and then make The route cannot be learned normally for a long time

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