Example 4-17
has both an O IA and an O E2 route.
Example 4-17 Determining OSPF Route Types
RouterX#sshhooww iipp rroouuttee
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
ia - IS-IS inter area, * - candidate default,
o - ODR, P - periodic downloaded static route
Troubleshoot
OSPF Neighbor
Adjacencies
Troubleshoot
OSPF Routing
Table Issues
Troubleshoot
OSPF
Authentication
Are all
required OSPF
networks being
advertised?
Are there
any route filters
that block OSPF
networks?
Troubleshooting OSPF 165
The network command that you con?¬?gure under the OSPF routing process also indicates which
networks OSPF advertises.
The show ip protocols command indicates whether any route ?¬?lters have been implemented,
which can affect which routes are seen in the routing table. The command, as shown in Example
4-18, also displays the networks that have been con?¬?gured to be advertised to other OSPF routers.
Troubleshooting Plaintext Password Authentication
If you are using OSPF password authentication, you must also be prepared to troubleshoot any
authentication problems that may occur during the adjacency process.
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