Problem with Export Filter in OSPF

[Ondrej Zajicek]

On Thu, Oct 25, 2012 at 11:03:43AM +0200, Wendler, Daniel wrote:
> Hello...again,
> 
> maybe another simple question and/or problem for me...
> Following output is produced, when i type "birdc show ospf state":
> 
> BIRD 1.3.8 ready.
> 
> area 0.0.0.0
> 
> 	router 10.110.1.118
> 		distance 0
> 		xnetwork 0.0.0.0/0 metric 0
> 
> area 0.0.0.18
...
> 
> 
> I can not see any of the 10.111. Routes from Router ID 10.110.1.116.
> On none of the both Systems are any filters set (import all; / export all;)
> 
> Any idea about this?

This is because you have a broken backbone (area 0.0.0.0, see above in
show ospf state, it contains just 10.110.1.118 ). Area boundary
routers have to be connected by backbone. You have to setup some vlinks
or merge some areas to the backbone.

And, as i wrote before in this mailing list, some OSPF area hints:

1. rule of OSPF areas: Don't use it unless you know exactly what are you doing.

2. rule of OSPF areas: If you still want to use it, stick to stub and
   NSSA areas and avoid transit areas and vlinks. Just change transit
   areas to the backbone.

-- 
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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