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Loop Routing in Router due to Wrong Default Route

Publication Date:  2012-07-27  |   Views:  138  |   Downloads:  0  |   Author:  phunam  |   Document ID:  EKB0000150472

Contents
Issue Description Alarm Information Handling Process Root Cause Suggestions

Issue Description

Connect VMS company switch to Quidway AR28-31, 2 router in cluster mode. already configured the routing table.can ping to default GW VMS  10.151.22.1 and ping to router IP but cannot ping to IP of server in some segment.we used the command: ip route-static 203.160.109.24 24 preference 60, can not ping to 203.160.109.24 and almost server in VMS company, only can ping to router IP when set ip route-static command.

Alarm Information

promt: destination host unreachable or request timed out.

Handling Process

we found problem that may be the loop routing, we only changed the command and point all the network to VMS default GW, command is: ip route-static 0.0.0.0 0.0.0.0 10.151.22.1 preference 60
after that the network to internet is normal. 

Root Cause

the first we think have problem with VMS routing because we can ping to default gateway VMS but cannot ping to VMS  Server.
second transfer to dynamic routing
third is  may be loop routing or not enough routing in Quidway.
In first routing table,command is: ip route-static 10.151.22.18 24 10.151.22.1 preference 60; 10.151.22.1 is VMS default GW, and 10.151.22.18 is master Quidway. 

Suggestions

If you have the routing problem when customer said already configured all for you, you should check the default route and route all the inside network can point to outside default gateway so avoiding loop routing or cannot find routing path.
command: ip route-static 0.0.0.0 0.0.0.0 10.151.22.1 preference 60
note: this for static routing.
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