[c-nsp] IPv6 prefix-list oddness under SXI

[Peter Taphouse]

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Hello,

We've got a pair of 7600/720-3BXL routers, one is running SXI3 and the
other SXF16 .  Both have some IPv6 unicast BGP sessions set up to a few
customer boxes running quagga, and I've added a prefix-list to limit
them to receiving only a IPv6 default route.  This works fine on the SXF
box, but from the SXI box the customer is seeing a lot of lines similar
to this in their bgp logs (they're filtering to stop them actually
receiving the prefixes):

2010/07/23 14:22:26 BGP: 2001:41c8:20:10::2 Can't find the route
2607:fbc0::/32
2010/07/23 14:22:39 BGP: 2001:41c8:20:10::2 rcvd UPDATE about
2001:40e8::/32 -- withdrawn
2010/07/23 14:22:39 BGP: 2001:41c8:20:10::2 Can't find the route
2001:40e8::/32
2010/07/23 14:22:45 BGP: 2001:41c8:20:10::2 rcvd UPDATE about
2607:fbc0::/32 -- withdrawn
2010/07/23 14:22:45 BGP: 2001:41c8:20:10::2 Can't find the route
2607:fbc0::/32
2010/07/23 14:22:45 BGP: 2001:41c8:20:10::2 rcvd UPDATE about
2607:fbc0::/32 -- withdrawn

Where 2001:41c8:20:10::2 is the address of our router.

Our SXI router also shows:

show bgp ipv6 unicast neighbors 2001:41c8:20:10::10 advertised-routes

BGP table version is 454837, local router ID is 89.16.160.2
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

Originating default network ::/0

   Network          Next Hop            Metric LocPrf Weight Path

Total number of prefixes 0

Has anyone seen this behaviour before?

- --
Peter Taphouse

Bytemark Hosting
http://www.bytemark.co.uk/
tel. +44 (0) 845 004 3 004
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