From: amernas (taloust@gmail.com)
Date: Thu Oct 23 2008 - 22:13:31 ARST
check this link for more :http://www.cciecandidate.com/?p=333
Omkar Tambalkar wrote:
> In this lab there are 2 ABRs for the NSSA but lab asks you to hard-code the
> router-ids on one of the ABRs so that it becomes the router to convert the
> Type 7 LSA received by the NSSA ASBR in Type 5 LSA to be advertised into
> area 0.
> My area 0 router database shows that it is learning the external route by
> the ABR that was hard-coded to advertise the Type 5 LSA but shows that the
> route is reachable via both ABRs in the routing table. Why would it install
> the route from the other ABR when its LSDB does not contain that route as
> being advertised by that ABR?
>
> LSDB section for External routes on Area 0 router:
> Type-5 AS External Link States
> Link ID ADV Router Age Seq# Checksum Tag
> 160.1.50.0 155.1.0.5 1905 0x80000005 0x00E442 0
> 160.1.60.0 200.200.200.200 129 0x80000004 0x00B642 0
> ---------------->ABR supposed to advertise the external route
> Rack1R5#
>
> Routing table of Area 0 router:
> Rack1R5#sh ip route ospf
> 155.1.0.0/24 is subnetted, 2 subnets
> O IA 155.1.146.0 [110/74] via 155.1.0.4, 00:32:59, Serial0/0
> [110/74] via 155.1.0.1, 00:32:59, Serial0/0
> 160.1.0.0/24 is subnetted, 2 subnets
> O E2 160.1.60.0 [110/20] via 155.1.0.1, 00:32:59, Serial0/0
> ----------------------> should be only this route
> [110/20] via 155.1.0.4, 00:32:59, Serial0/0
> ----------------------> why are you here also?
> 150.1.0.0/16 is variably subnetted, 4 subnets, 2 masks
> O IA 150.1.6.6/32 [110/75] via 155.1.0.4, 00:32:59, Serial0/0
> [110/75] via 155.1.0.1, 00:32:59, Serial0/0
> O IA 150.1.4.4/32 [110/65] via 155.1.0.4, 00:32:59, Serial0/0
> O IA 150.1.1.1/32 [110/65] via 155.1.0.1, 00:32:59, Serial0/0
>
> Also the second ABR of the NSSA has the Type 7 LSA received by the ASBR of
> the NSSA but when it installs the external route in its routing table, it
> installs it as E2 external route, why does it prefer the E2 route instead of
> N2 route, is it because the E2 route is coming from the other ABR as a
> external route via its interface in area 0
> IP routing table of the second ABR of NSSA:
> O E2 160.1.60.0 [110/20] via 155.1.146.6, 00:35:07, Ethernet0/0
> -------------> advertised as E2
>
> - Later,
> Omkar
>
>
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