[c-nsp] Difference in OSPF maximum-paths - operational problem?

[David Prall]

It is my experience that 6 of the 7 will randomly be chosen, each time an
SPF run is done a different 6th could be installed. With enough CPU power it
shouldn't cause issues, but in the past I've seen routers running close to
the limit that cause traffic loss. This was with the default configuration
of 4 and having the possibility of 8 though, so we may have been removing
all 4 active and replacing them at times. We upped the maximum to 8 and
never had the issue again.

David

--
http://dcp.dcptech.com


> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Rick Ernst
> Sent: Friday, January 08, 2010 3:45 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Difference in OSPF maximum-paths - operational
> problem?
> 
> I have several generations of Cisco equipment in my network, and am in
> the
> middle of a rolling upgrade.  There are currently 3 core routers and
> all
> routers in the network use OSPF maximum-paths 6.  With an A/B network
> and 3
> cores, this works fine.  Some of the equipment is limited to 6 paths,
> some
> can handle 8.
> 
> 
> If I add the 4th router, I'll have 7 paths (the new cores will be
> either "A"
> or "B", not both).  Will OSPF just pick 6 of the 7 possible paths, or
> is
> something horrible going to happen?
> 
> Thanks,
> Rick
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