OSPF state inconsistency

[Ondrej Zajicek]

On Sun, Feb 21, 2016 at 12:12:43PM +0100, Przemyslaw Frasunek wrote:
> Dear all,
> 
> I'd like to reopen this thread. The problem still persists on BIRD 1.5.0.

Interesting. Could you send me output of 'show ospf state',
'show ospf lsadb' and 'show route' when the situation happens?

How OSPF learns subscriber routes? From the kernel proto? I don't see any
non-OSPF route on 'birdc show route' below, but there should be at least
one for the current session.

You have 'preference 10' for OSPF, this is the same as the default
preference for kernel protocol. That is unreliable, you should ensure
that kernel protocol has higher preference than OSPF, if you want to
export kernel routes to OSPF.


> > Unfortunately, we are experiencing OSPF state inconsistency between access
> > servers, when user quickly disconnects from one node and connects to another.
> > This is such example, which caused routing loop:
> > 
> > (on 193.138.118.89)
> > # birdc show route for 46.21.220.80/28
> > BIRD 1.4.5 ready.
> > 46.21.220.80/28    via 193.138.118.90 on vlan0 [ospf1 13:08:12] * E2
> > (10/10/10000) [193.138.118.90]
> > 
> > (on 193.138.118.90)
> > # birdc show route for 46.21.220.80/28
> > BIRD 1.4.5 ready.
> > 
> > 46.21.220.80/28    via 193.138.118.89 on vlan0 [ospf1 13:12:32] * E2
> > (10/10/10000) [193.138.118.89]
> > 
> > Any ideas, how to fix it?

-- 
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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