esj at cs
May 1, 2012, 10:05 AM
Post #1 of 2
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problem with ospf6d SPF calculation? Losing ASE type 1 default route
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Got an odd issue with IPv6 ospf6d.
I have a couple quagga routers (0.99.20.1 on linux) that share
a network with a Cisco router that is functioning as Area Border Router.
The Area is 131.94.128.0
The cisco Area Border Router also connects to area 0. In area 0 is a
ASBR that is injecting a default route (::0/0)
When I bring up router1 all seems fine. Router1 receives and uses
a few routes from area 0, and announces a downstream network as well.
But as soon as I bring up router 2, after the DB exchange a LSA is sent
from router2 to router1, and this causes router1 to do a SPF calculation.
When router1 does this SPF calculation it loses the default route.
Well, it discards the default route.
router2 comes up fine, and it does use the ASE default route.
Until something changes and a SPF calc is done on router2, then
it will discard the default route.
Any ideas what is happening here? It doesn't make sense to me
other than some bug in the SPF calculation. But maybe I am
missing something??
E
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Details available via web in directory
http://users.cis.fiu.edu/~esj/quagga-problem-ospf3/
http://users.cis.fiu.edu/~esj/quagga-problem-ospf3/network.png
is the picture
http://users.cis.fiu.edu/~esj/quagga-problem-ospf3/router1.ospf6d.conf
http://users.cis.fiu.edu/~esj/quagga-problem-ospf3/router2.ospf6d.conf
are the relevant parts of the config files of the two quagga routers
http://users.cis.fiu.edu/~esj/quagga-problem-ospf3/ospf6d.log
router1 ospf6d logs with the following set:
debug ospf6 message lsupdate
debug ospf6 lsa unknown
debug ospf6 zebra
debug ospf6 spf process
debug ospf6 route table
debug ospf6 route intra-area
debug ospf6 route inter-area
debug ospf6 asbr
debug ospf6 abr
also has some annotation by me and references to packets
in the .pcap
http://users.cis.fiu.edu/~esj/quagga-problem-ospf3/ospf6-database-before
show ospf6 database detail
show ospf6 database dump
before the LSA arrived and the SPF ran
http://users.cis.fiu.edu/~esj/quagga-problem-ospf3/ospf6-database-after
show ospf6 database detail
show ospf6 database dump
after the LSA arrived and the SPF ran and the ASE type 1 with the default
route was removed.
http://users.cis.fiu.edu/~esj/quagga-problem-ospf3/tcpdump.full.pcap
a pcap from the point of view of router1 as all this
was happening.
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