OSPF: External routes (ABR vs ASBR)

[Ondrej Zajicek]

On Tue, Oct 09, 2012 at 03:51:46PM +0200, Ruben Laban wrote:
> Hi Ondrej,
>
> On 10/9/2012 3:04 PM, Ondrej Zajicek wrote:
>> On Tue, Oct 09, 2012 at 11:16:24AM +0200, Ruben Laban wrote:
>>> Hi list,
>>>
>>> I'm trying to figure out how bird distinguishes between imported routes
>>> that are shown as "external" route directly under the router's id (in
>>> "show ospf state") and those listed under the "other ASBRs" header. I
>>> have different boxes showing different behavior. I just can't seem to
>>> pinpoint the reason for a route show up under the "other ASBRs" header.
>>
>> If current router does not have router LSA for that ASBR then its routes
>> are listed under "other ASBRs" header. These are usually ASBRs from
>> non-adjacent areas.
>
> I'm afraid my lack of in-depth OSPF terminology is failing me here a  
> bit, as I can't make much from what you just said.
>
> The routers listed as "other ASBRs" are listed under "area 0.0.0.0" as  
> well. With stubnets listed in area 0.0.0.0, and externals listed as  
> under other ASBRs. This happens for 2 (unrelated) routers in my  
> networks. I have several other routers in my network where the stubnets  
> and externals are listed just fine directly in the "area 0.0.0.0" block.

If you have just one area (0.0.0.0), then you shouldn't get
"other ASBRs". Or perhaps only in the case that given routers
are unreachable or when LSA databases are not properly synchronized.
Could you send me the output of:

show ospf state
show ospf state all
show ospf lsadb
show ospf neighbors

on 'strange' and normal node?

-- 
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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