The show ip ospf borderrouters Command

show ip ospf border-routers

This command shows the OSPF ABRs and ASBRs for which the internal router has entries in its routing table. This command is excellent for troubleshooting configuration errors and understanding how the network is communicating about its routes.

Example 6-9 shows the output of this command. Example 6-9 show ip ospf border-routers Output

Router# show ip ospf border-routers

OSPF Process 100 internal Routing Table

Example 6-9 shows the output of this command. Example 6-9 show ip ospf border-routers Output

Router# show ip ospf border-routers

OSPF Process 100 internal Routing Table

Destination

Next Hop

Cost

Type

Rte Type

Area

SPF No

160.89.97.53

144.144.1.

53

10

ABR

INTRA

0.0.0.3

3

160.89.103.51

160.89.96.

51

10

ABR

INTRA

0.0.0.3

3

160.89.103.52

160.89.96.

51

20

ASBR

INTER

0.0.0.3

3

160.89.103.52

144.144.1.

53

22

ASBR

INTER

0.0.0.3

3

Table 6-3 explains the meaning of the important fields in the output of the show ip ospf border-routers command.

Table 6-3 Explanation of the show ip ospf border-routers Command Output

Field

Explanation

OSPF Process 100 Internal Routing Table

This is the OSPF routing process ID for the router.

Destination

This is the router ID of the destination router, whether an

ABR or an ASBR.

Next Hop

If the ABR or ASBR is not directly connected, this is the

address of the next logical hop in the chosen path to the

ABR or ASBR.

Cost

This is the metric or cost of taking this path to the

destination.

Type

This states whether the destination router is an ABR or

ASBR or both.

Table 6-3 Explanation of the show ip ospf border-routers Command Output (Continued)

Field

Explanation

Rte Type

The is the type of this route; it is either an intra-area or

interarea route.

Area

This is the area ID of the area that this route is learned

from.

SPF No

This is the SPF calculation number that installed this

route into the routing table.

The show ip ospf border-routers command is useful to verify that the configuration has worked and that the OSPF network is functioning correctly. In a multiarea network, show ip ospf border-routers command can immediately indicate why users cannot connect outside their area.

It is helpful to extract this information from what could be a long routing table, within which this information is scattered.

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