OSPF weird behaviour

[Ondrej Zajicek]

On Fri, Jan 24, 2014 at 03:50:45PM +0600, Eugene M. Zheganin wrote:
> Hi.
> 
> I'm running bird in a large (well, meaning enterprise large, not ISP
> large) network. I'm using mostly 1.3.11/1.4.0 versions, and FreeBSD on
> all of the servers that are running bird. My network consists of several
> network hubs, that local branche offices are attached to. These hubs
> reside in large cities, and most of them are running some dynamic
> routing protocols aside from OSPF (BGP and RIP). Of course I'm writing
> this post not to share this useless information, but to describe a
> problem that I have. This problem involves two network sites, lets call
> them A and B. A consists of several networks and several routers, this
> is a largest site in my network, and site B consists of two bird routers
> running FreeBSD with VRRP/CARP (one active in each moment) and two
> dozens of branch offices, running mostly FreeBSD/quagga (they were
> deployed before I started using bird), and some of them running Cisco
> IOS/RIP. Site A and B are connected via a gre tunnel and OSPF in it.
> 
> The problem is, that in some random moment site A receives a route
> announce from site B containing a route that clearly belongs to a site
> A. I know this behavior is typical to distance-vector protocol, not for
> a link state protocol, and it's kind of an impossible situation, but
> this is exactly what I'm seeing in birdc. The router at site A indicates
> that it received a route from router at B via OSPF, but in the same time
> the B router claims that this route clearly points to A.

Hi

Could you send me 'show ospf state all' and 'show ospf lsadb' output
from both routers?

> I know that this information isn't enough to diagnose the problem, and I
> wanted to know what should I get to help diagnose this. I should say
> also, that at this time I get like 100 megabytes per day of bird logs
> consisting mostly of 'OSPF: LSA disappeared [...]' messages, and, since

These could be ignored (or better filtered in syslog).

-- 
Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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