From: Joseph Saad (joseph.samir.saad@gmail.com)
Date: Sat Nov 24 2007 - 02:12:53 ART
Rory,
Only one of the ABR's, the one with highest Router-id, will be
translating as rightly highlighted by Antonio.
The Translating ABR will show the route as N2 while the other ABR(s)
and routers outside the NSSA should see the route as E2.
RFC 3101 is tedious but useful reading.
Joseph
On Nov 24, 2007 4:33 AM, Antonio Soares <amsoares@netcabo.pt> wrote:
> Both R2 and R5 are ABRs connected to an NSSA area. Only the router with the
> higher router-id will translate type-7 LSAs to type-5 LSAs. Assure that R2's
> router-id is higher than R5's.
>
> In your output, R2 must show must this line:
>
> "Perform type-7/type-5 LSA translation"
>
>
>
> Regards,
>
> Antonio Soares
> CCIE #18473 (R&S),CCNP,CCIP,JNCIA-ER
> http://pwp.netcabo.pt/amsoares/
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Rory
> Grant
> Sent: sexta-feira, 23 de Novembro de 2007 16:19
> To: 'ccielab@groupstudy.com'
> Subject: IE lab 4 Q 4.4 -- N2 to E2 not translating
>
> Hi there,
>
> SW2 is redistributing it 150.1.8.8 into OSPF nssa area 1:
>
> Rack1SW2#sh run | b router os
> router ospf 1
> router-id 150.1.8.8
> log-adjacency-changes
> area 1 nssa
> redistribute connected subnets route-map CONNECTED-->OSPF
> network 141.1.0.8 0.0.0.0 area 1
> network 141.1.8.8 0.0.0.0 area 1
> network 141.1.88.8 0.0.0.0 area 1
> network 141.1.255.8 0.0.0.0 area 1
> !
> route-map CONNECTED-->OSPF permit 10
> match interface Loopback0
>
> R2 learns it as a N2 route as expected:
>
> Rack1R2#sho ip rout os
> 51.0.0.0/32 is subnetted, 1 subnets
> O E2 51.51.51.51 [110/20] via 141.1.123.1, 00:20:19, Serial0/0/0
> 141.1.0.0/24 is subnetted, 6 subnets
> O 141.1.255.0 [110/2] via 141.1.0.8, 00:19:39, FastEthernet0/0
> O 141.1.8.0 [110/2] via 141.1.0.8, 00:19:39, FastEthernet0/0
> O 141.1.88.0 [110/2] via 141.1.0.8, 00:19:39, FastEthernet0/0
> O IA 192.10.1.0/24 [110/65] via 141.1.123.1, 00:20:19, Serial0/0/0
> 150.1.0.0/16 is variably subnetted, 4 subnets, 2 masks
> O 150.1.3.3/32 [110/65] via 141.1.123.3, 00:20:19, Serial0/0/0
> O 150.1.1.1/32 [110/65] via 141.1.123.1, 00:20:19, Serial0/0/0
> O N2 150.1.8.0/24 [110/20] via 141.1.0.8, 00:19:39, FastEthernet0/0
>
> This N2 prefix should be translated to an E2 prefix on R2 but doesn't:
>
> Rack1R2#sh ip os | b Area 1
> Area 1
> Number of interfaces in this area is 1
> It is a NSSA area
> Area has no authentication
> SPF algorithm last executed 00:20:16.600 ago
> SPF algorithm executed 19 times
> Area ranges are
> Number of LSA 7. Checksum Sum 0x037058
> Number of opaque link LSA 0. Checksum Sum 0x000000
> Number of DCbitless LSA 0
> Number of indication LSA 0
> Number of DoNotAge LSA 0
> Flood list length 0
>
> R1 and R3 do not receive the 150.1.8.8 prefix:
>
> Rack1R3#sho ip ro os
> 51.0.0.0/32 is subnetted, 1 subnets
> O E2 51.51.51.51 [110/20] via 141.1.123.1, 00:16:27, Serial4/0.1
> 141.1.0.0/24 is subnetted, 8 subnets
> O IA 141.1.255.0 [110/66] via 141.1.123.2, 00:16:32, Serial4/0.1
> O IA 141.1.8.0 [110/66] via 141.1.123.2, 00:16:32, Serial4/0.1
> O IA 141.1.0.0 [110/65] via 141.1.123.2, 00:16:59, Serial4/0.1
> O 141.1.25.0 [110/11175] via 141.1.123.2, 00:16:59, Serial4/0.1
> O IA 141.1.88.0 [110/66] via 141.1.123.2, 00:16:32, Serial4/0.1
> O IA 192.10.1.0/24 [110/65] via 141.1.123.1, 00:16:59, Serial4/0.1
> 150.1.0.0/16 is variably subnetted, 3 subnets, 2 masks
> O 150.1.2.2/32 [110/65] via 141.1.123.2, 00:16:59, Serial4/0.1
> O 150.1.1.1/32 [110/65] via 141.1.123.1, 00:16:59, Serial4/0.1
>
> Rack1R1#sho ip ro os
> 51.0.0.0/32 is subnetted, 1 subnets
> O E2 51.51.51.51 [110/20] via 192.10.1.254, 00:47:06, FastEthernet0/0
> 141.1.0.0/24 is subnetted, 6 subnets
> O IA 141.1.255.0 [110/66] via 141.1.123.2, 00:00:49, Serial0/0/0.1
> O IA 141.1.8.0 [110/66] via 141.1.123.2, 00:00:49, Serial0/0/0.1
> O IA 141.1.0.0 [110/65] via 141.1.123.2, 00:01:27, Serial0/0/0.1
> O 141.1.25.0 [110/11175] via 141.1.123.2, 00:01:17, Serial0/0/0.1
> O IA 141.1.88.0 [110/66] via 141.1.123.2, 00:00:49, Serial0/0/0.1
> 150.1.0.0/16 is variably subnetted, 3 subnets, 2 masks
> O 150.1.3.3/32 [110/65] via 141.1.123.3, 00:45:08, Serial0/0/0.1
> O 150.1.2.2/32 [110/65] via 141.1.123.2, 00:45:08, Serial0/0/0.1
>
> When I remove the NSSA area from SW2, R2 and R5 then both R3 and R1 receives
> an E2 for 150.1.8.8:
>
> Rack1R1#sho ip ro os
> 51.0.0.0/32 is subnetted, 1 subnets
> O E2 51.51.51.51 [110/20] via 192.10.1.254, 01:26:09, FastEthernet0/0
> 141.1.0.0/24 is subnetted, 6 subnets
> O IA 141.1.255.0 [110/66] via 141.1.123.2, 00:02:48, Serial0/0/0.1
> O IA 141.1.8.0 [110/66] via 141.1.123.2, 00:02:48, Serial0/0/0.1
> O IA 141.1.0.0 [110/65] via 141.1.123.2, 00:40:30, Serial0/0/0.1
> O 141.1.25.0 [110/11175] via 141.1.123.2, 00:40:20, Serial0/0/0.1
> O IA 141.1.88.0 [110/66] via 141.1.123.2, 00:02:48, Serial0/0/0.1
> 150.1.0.0/16 is variably subnetted, 4 subnets, 2 masks
> O 150.1.3.3/32 [110/65] via 141.1.123.3, 01:24:11, Serial0/0/0.1
> O 150.1.2.2/32 [110/65] via 141.1.123.2, 01:24:11, Serial0/0/0.1
> O E2 150.1.8.0/24 [110/20] via 141.1.123.2, 00:02:38, Serial0/0/0.1
>
> Rack1R3#sho ip ro os
> 51.0.0.0/32 is subnetted, 1 subnets
> O E2 51.51.51.51 [110/20] via 141.1.123.1, 00:02:30, Serial4/0.1
> 141.1.0.0/24 is subnetted, 8 subnets
> O IA 141.1.255.0 [110/66] via 141.1.123.2, 00:02:39, Serial4/0.1
> O IA 141.1.8.0 [110/66] via 141.1.123.2, 00:02:40, Serial4/0.1
> O IA 141.1.0.0 [110/65] via 141.1.123.2, 00:02:50, Serial4/0.1
> O 141.1.25.0 [110/11175] via 141.1.123.2, 00:02:50, Serial4/0.1
> O IA 141.1.88.0 [110/66] via 141.1.123.2, 00:02:39, Serial4/0.1
> O IA 192.10.1.0/24 [110/65] via 141.1.123.1, 00:02:50, Serial4/0.1
> 150.1.0.0/16 is variably subnetted, 4 subnets, 2 masks
> O 150.1.2.2/32 [110/65] via 141.1.123.2, 00:02:50, Serial4/0.1
> O 150.1.1.1/32 [110/65] via 141.1.123.1, 00:02:50, Serial4/0.1
> O E2 150.1.8.0/24 [110/20] via 141.1.123.2, 00:02:30, Serial4/0.1
>
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