IE lab 4 Q 4.4 -- N2 to E2 not translating

From: Rory Grant (Rory.Grant@telindus.co.uk)
Date: Fri Nov 23 2007 - 13:18:46 ART

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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

Next message: Narbik Kocharians: "Re: BGP Next-Hop"
Previous message: Narbik Kocharians: "Re: BGP Next-Hop"
Next in thread: Antonio Soares: "RE: IE lab 4 Q 4.4 -- N2 to E2 not translating"
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Maybe reply: Joseph Saad: "Re: IE lab 4 Q 4.4 -- N2 to E2 not translating"
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