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Knowledge Base

OSPF Neighbor is Down When IP-Trunk Disconnects POS

Publication Date:  2012-07-27  |   Views:  118  |   Downloads:  0  |   Author:  Chen Jie  |   Document ID:  EKB0000269796

Contents

Issue Description

Topology:
NE40--transmission device--NE80, there are four 155M POS links forming IP-Trunk and OSPF is enabled. One POS link at NE40 is down and OSPF neighbor instantly interrupts.
NE40 version is VRP3.10-2351SP02 and NE80 version is VRP3.10-2351SP02.

Alarm Information

It prompts OSPF neighbor is down and the alarm is as follows:
%Dec  8 01:55:02 2006 NE80-B-XM1 RM/5/RTLOG:Last neighbor down event: ROUTER ID:
 58.23.96.98 LOCAL ADDRESS: 218.107.221.41 REMOTE ADDRESS: 218.107.221.42 REASON
: DeadInterval timer overtime 

Handling Process

L3 IP-Trunk changes from Hash by traffic to Hash by packet and the problem can be solved (VRP3.10-2351 version supports Hash by traffic).
      

Root Cause

1. Hash is applied and Hello packet of OSPF neighbor hashes to the link.
2. There is transmission device in the intermediate. The link at NE40 is down, but the physical and protocol state of NE80 are up. NE80 does not know the peer is unreachable and it still sends Hello packet until it is timeout and the neighbor is down.
      

Suggestions

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