[c-nsp] ISIS Route Flapping Issue
Peter Rathlev
peter at rathlev.dk
Thu Nov 6 15:40:49 EST 2008
On Thu, 2008-11-06 at 09:48 -0500, David Jacobs wrote:
> When I do a "sh spf-log" this is the message I keep seeing
>
> On Cisco
>
> 00:24:50 72 109 8 router1.00-00 TLVCONTENT
> 00:24:20 72 109 8 router1.00-00 TLVCONTENT
> 00:23:50 76 109 8 router1.00-00 TLVCONTENT
> 00:23:20 64 109 8 router1.00-00 TLVCONTENT
> 00:22:50 76 109 8 router1.00-00 TLVCONTENT
> 00:22:20 72 109 8 router1.00-00 TLVCONTENT
> 00:21:50 72 109 8 router1.00-00 TLVCONTENT
> 00:21:20 72 109 8 router1.00-00 TLVCONTENT
> 00:20:50 72 109 8 router1.00-00 TLVCONTENT
> 00:20:19 72 108 7 router1.00-00 TLVCONTENT
> 00:19:49 72 108 8 router1.00-00 TLVCONTENT
> 00:19:19 68 108 8 router1.00-00 TLVCONTENT
This is from a neighboring router, right?
It seems the router is sending out LSP TLV changes, and rather many of
them. In each 30 second interval the router sent 8 TLV changes, about
one every four seconds.
What does "show isis lsp-log" say on "router1"?
> and on Foundry
>
> 1m55s 450ms 78 6 router1.00-00 Area Address TLV Change
> 2m26s 450ms 39 17 router1.00-00 Area Address TLV Change
> 2m56s 450ms 39 17 router1.00-00 Area Address TLV Change
> 3m27s 450ms 39 13 router1.00-00 Area Address TLV Change
> 3m57s 450ms 39 18 router1.00-00 Area Address TLV Change
I don't know Foundry, but I could be tempted to read this as "Area ID
changed".
> > A shot in the dark, but you wouldn't happen to have another box with
> > the same NET on your network?
>
> I thought of that as well, But I compared all of the other NET
> address's and they are pretty unique. And correct me if i'm wrong, but
> if there was another router running ISIS with the same NET address
> wouldn't it come up with an error like..
>
> %CLNS-4-BADPACKET: ISIS: LAN L2 hello, Duplicate system
> ID detected from (duplicate NET address)
That sounds reasonable.
> I forget if there is a command to view all NET address's in the database
That would be "show isis hostname".
Regards,
Peter
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