Re: ospf "show ip ospf route" output doubt

Rakesh,

Routers that are completely inside the backbone really have no clue about
other area numbers, they only know what routes are inter-area because of the
type 3 LSA. So from R0's standpoint, 172.16.123.0 is an inter-area route
inside of area 0. From R1's view, it is an intra-area route in area 1.

On Tue, Jun 23, 2009 at 7:50 AM, Joe Astorino <jastorino_at_ipexpert.com>wrote:

> Ivan to the rescue :)
>
> http://blog.ioshints.info/2007/10/display-ospf-spf-tree.html
>
> Regards,
>
> Joe Astorino
> CCIE #24347 (R&S)
> Sr. Support Engineer - IPexpert, Inc.
> URL: http://www.IPexpert.com
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> rakesh m
> Sent: Tuesday, June 23, 2009 8:45 AM
> To: Cisco certification
> Subject: ospf "show ip ospf route" output doubt
>
> i was trying with simple 3 router topology for configuring virtual links .
> why does area 0 appear in the following output instead of
> area 1 in IA inter area route
>
> topology (ro(172.16.23.0 area 0)--->r1(172.16.123.0 area 1)----->r2
>
> r0#show ip ospf route
>
> OSPF Router with ID (0.0.0.1) (Process ID 1)
>
> Area BACKBONE(0)
>
> Intra-area Route List
> * 172.16.26.0/24, Intra, cost 10, area 0, Connected
> via 172.16.26.1, FastEthernet0/0
>
> Intra-area Router Path List
> i 172.16.26.2 [10] via 172.16.26.2, FastEthernet0/0, ABR, Area 0, SPF 5
> *
> Inter-area Route List
> *> 172.16.123.0/24, Inter, cost 74, area 0
> via 172.16.26.2, FastEthernet0/0*
>
> Thank you
> --
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-- 
Bryan Bartik
CCIE #23707 (R&S), CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com
Blogs and organic groups at http://www.ccie.net