[AusNOG] OSPF installing a higher cost route (6k / 7600)

[Richard.Mckenna at bankwest.com.au]

Hi AusNOG,

Has anyone ever heard of this behaviour with Cisco 6k / 7600's:

" As a result of mis-configuration or LAN segment partitioning, LSDB of
OSPF
area contains more than one Net (Type-2) LSA describing same IP prefix/mask
pair, then OSPF will install into routing table route with worst (biggest)
metric for this prefix."

If you have a L2 partition OSPF will install into the route table a poorer
route to the destination network.
It caused us a routing loop, and I would never expected to see higher
metric route installed... argh.

cheers,

Richard McKenna
Network Engineer, IT Infrastructure
Bankwest Information Technology
Phone: 08 9449 8048
Mobile: 0448 891 023
Email: richard.mckenna at bankwest.com.au


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