From: Peter van Oene (pvo@usermail.com)
Date: Sun May 02 2004 - 20:41:09 GMT-3
At 04:36 PM 5/2/2004, Bob Sinclair wrote:
>Remember that when you issue the command "show ospf database" you see one
>line per LSA. Each Router LSA may report multiple links. Try issuing the
>command:
>
>show ip ospf database router
>
>This will give you a more comprehensive list of actual links in that area.
>If you have a lot of links, try issuing the above with a "pipe include" on
>the end, e.g.
>
>sh ip ospf database router | include 1.1.1.0
>
>Are you running multiple protocols? You could be seeing this LSA from
>multiple ABRs if you are doing mutual redistribution at multiple points with
>another protocol.
Type 3's are IA routes. Redistribution shouldn't come into play. You
should only see these three's in areas where they don't live in
1/2's. All one needs to do is look at the ospf database and see who
advertised the three.
>HTH,
>
>Bob Sinclair
>CCIE #10427, CISSP, MCSE
>www.netmasterclass.net
>
>----- Original Message -----
>From: "CCIE 2004" <ccie2004@excite.com>
>To: <ccielab@groupstudy.com>
>Sent: Sunday, May 02, 2004 3:21 PM
>Subject: BAD LSA in OSPF Database - How to determine originator
>
>
> > Hi, I am trying to figure out if you have a Bad LSA being generated by
>ABR's how do you find out who is the originator. I have looked around and am
>going in circles because all I have are summary LSA's pointing to the other
>ABRs. My thinking is that the LSA has to be originated somewhere. I have
>checked all ABR's and do not find anything except Type 3 LSA's. This is
>causing a subnet to be blackholed because the routers are seeing a /26
>coming from somewhere. Can someone please lay out the steps to follow to
>troubleshoot this. Thanks
> >
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