14.3.8 Checking OSPF advertised routes [SL-L3A]

AS External LSAs and NSSA External LSAs contain the OSPF routes selected for advertisement by advertised route filtering.

To check which of the AS External LSAs have been generated by the Switch, execute the show ip ospf operation command with the database, external, and self-originate parameters specified.

Figure 14-17: AS-External-LSA indication (only generated by the local device)
> show ip ospf database external self-originate Date 20XX/07/14 12:00:00 UTC Domain: 1 Local Router ID : 200.199.198.197 Area : 0 Address State Priority Cost Neighbor DR Backup DR 177.7.7.1 BackupDR 1 1 1 1.4.8.0 200.199.198.197 LS Database: AS External Link Network Address: 192.168.1/24, AS Boundary Router: 200.199.198.197 ..1 LSID: 192.168.1.0 Age: 221, Length: 36 , Sequence: 80000001, Checksums: BB9C -> Type: 2, Metric: 20, Tag: 00000000, Forward: 0.0.0.0

Figure 14-17: AS-External-LSA indication (only generated by the local device)

> show ip ospf database external self-originate
Date 20XX/07/14 12:00:00 UTC
Domain: 1
Local Router ID : 200.199.198.197
Area : 0
Address         State Priority Cost  Neighbor   DR              Backup DR
177.7.7.1       BackupDR 1     1     1          1.4.8.0         200.199.198.197
 
LS Database: AS External Link
Network Address: 192.168.1/24, AS Boundary Router: 200.199.198.197      ..1
    LSID: 192.168.1.0
    Age:  221, Length: 36 , Sequence: 80000001, Checksums: BB9C
     -> Type: 2, Metric: 20, Tag: 00000000, Forward: 0.0.0.0

Network Address (192.168.1/24) is the route's destination network.

To check which of the NSSA External LSAs have been generated by the Switch, execute the show ip ospf operation command with the database, nssa, and self-originate parameters specified.

Figure 14-18: Display NSSA-External-LSA
> show ip ospf database nssa self-originate Date 20XX/07/14 12:00:00 UTC Domain: 1 Local Router ID : 200.199.198.197 Area : 0 Address State Priority Cost Neighbor DR Backup DR 177.7.7.1 BackupDR 1 1 1 1.4.8.0 200.199.198.197 LS Database: NSSA AS External Link Network Address: 192.168.1/24, AS Boundary Router: 200.199.198.197 ..1 LSID: 192.168.1.0 Age: 39, Length: 36 , Sequence: 80000001, Checksums: 9FB6 -> Type: 2, Metric: 20, Tag: 00000000, Forward: 0.0.0.0

Figure 14-18: Display NSSA-External-LSA

> show ip ospf database nssa self-originate
Date 20XX/07/14 12:00:00 UTC
Domain: 1
Local Router ID : 200.199.198.197
Area : 0
Address         State Priority Cost  Neighbor   DR              Backup DR
177.7.7.1       BackupDR 1     1     1          1.4.8.0         200.199.198.197
 
LS Database: NSSA AS External Link
Network Address: 192.168.1/24, AS Boundary Router: 200.199.198.197      ..1
    LSID: 192.168.1.0
    Age:   39, Length: 36 , Sequence: 80000001, Checksums: 9FB6
     -> Type: 2, Metric: 20, Tag: 00000000, Forward: 0.0.0.0

Network Address (192.168.1/24) is the route's destination network.