Routing Protocol Information

Routing Protocol Information
In order to view detailed information about OSPF configured on the router, use the following
command:
plano#show ip ospf
Routing Process "ospf 1" with ID 172.20.192.1 and Domain ID 0.0.0.1
Supports only single TOS(TOS0) routes
Supports opaque LSA
It is an area border router
SPF schedule delay 5 secs, Hold time between two SPFs 10 secs
Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs
Number of external LSA 0. Checksum Sum 0x0
Number of opaque AS LSA 0. Checksum Sum 0x0
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 2. 2 normal 0 stub 0 nssa
External flood list length 0
Verifying and Troubleshooting OSPF 199
Area BACKBONE(0)
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm executed 6 times
Area ranges are
Number of LSA 5. Checksum Sum 0x39C58
Number of opaque link LSA 0. Checksum Sum 0x0
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
Area 2
Number of interfaces in this area is 2
It is a stub area
generates stub default route with cost 1
Area has no authentication
SPF algorithm executed 4 times
Area ranges are
Number of LSA 4. Checksum Sum 0x2A3F4
Number of opaque link LSA 0. Checksum Sum 0x0
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
The show ip OSPF command gives detailed information on how OSPF is configured on the
router. What we can learn from the preceding output is that the router is participating in OSPF
process 1, the router ID is 172.20.192.1, it is an area border router, it has one interface configured
in Area 0 and two interfaces configured in Area 2, which is a stub area, and none of the
areas are using authentication. This command also informs you of the configured area type.
The following command provides you with information about the interfaces on the router
configured for OSPF:
plano#show ip ospf interface
Serial2/0.1 is up, line protocol is up
Internet Address 10.10.10.2/24, Area 0
Process ID 1, Router ID 172.20.192.1, Network Type POINT_TO_POINT, Cost: 48
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:07
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
200 Chapter 6  Interconnecting OSPF Areas
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 192.168.24.1
Suppress hello for 0 neighbor(s)
FastEthernet2/0 is up, line protocol is up
Internet Address 20.20.20.1/24, Area 2
Process ID 1, Router ID 172.20.192.1, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 172.20.192.1, Interface address 20.20.20.1
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:07
Index 1/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
For each interface configured for OSPF, this command informs you of the OSPF process ID,
the router ID, the OSPF network type, the cost, the number of neighbors, the number of adjacent
neighbors, and the neighbor the router is adjacent with.