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Adjacency is Instable because Circuit-type Configuration of ISIS is False

Publication Date:  2019-07-11 Views:  99 Downloads:  0

Issue Description

1. Router A double-link connects L2 switch. Two interfaces of router A are interface A1 and interface A2. Router B double-link connects L2 switch. Two interfaces of router A are interface B1 and interface B2.
2. The interface of the router enables circuit-level level-2 and circuit-type p2p.
3. Log records Adjacency up/down frequently.

Alarm Information

Null

Handling Process

Change the type of interface circuit:
1. Change circuit-type of router interface as broadcast-type.
2. Change  circuit-type of one interface as broadcast-type. e.g. change circuit-type of interface A1 of router A as broadcast-type. Change circuit-type of interface B1 of router B as broadcast-type.

Root Cause

In this topology, the interface of router A can receive Hello packet sent by two interfaces of router B. But local circuit identifier of these two packets is different. A1 of router A, B1 and B2 of router B have possibility to set up Adjacency. When circuit-type of ISIS is p2p, there must be one Adjacency. A1 of router A and B1 and B2 of router B  frequently set up Adjacency. New Adjacency overwrites old Adjacency. Adjacency is instable.

Suggestions

Not use point-to-point circuit-type in broadcast network.

END