The show ip ospf Command

show ip ospf process-id

Example 5-6 shows the output of this command. Table 5-8 explains how to read this information.

Example 5-6 show ip ospf Output

SanJose#show ip ospf Routing Process "ospf 100" with ID 140.100.32.10 Supports only single TOS(TOS0) routes

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 DCbitless external LSA 0 Number of DoNotAge external LSA 0

Number of areas in this router is 1. 1 normal 0 stub 0 nssa Area 3

Number of interfaces in this area is 3 Area has no authentication SPF algorithm executed 10 times Area ranges are

Link State Update Interval is 00:30:00 and due in 00:18:54 Link State Age Interval is 00:20:00 and due in 00:08:53 Number of DCbitless LSA 2 Number of indication LSA 0 Number of DoNotAge LSA 0

Table 5-8 Explanation of the show ip ospf Command Output

Field

Explanation

SPF schedule delay

Specifies how long to wait to start the SPF calculation after receiving an LSA update.

Hold time between two SPFs

Specifies the minimum amount of time between SPF calculations.

Number of DCbitless external LSA

Is used with OSPF demand circuits.

(Refer to CCO for greater detail on this subject.)

Number of DoNotAge external LSA

Is used with OSPF demand circuits, such as ISDN.

Routing Process "ospf 100" with ID 140.100.32.10

Shows the local process ID for OSPF and the router ID that it will advertise.

Supports only single ToS (TOSO) OSPF is capable of carrying information about the type of routes service (ToS) that the IP datagram has requested. This is supported by Cisco in accordance to the RFCs but is not implemented. Therefore, ToS has the value of 0.

continues

Table 5-8 Explanation of the show ip ospf Command Output (Continued)

Field

Explanation

It is an internal router

Species the types of router that OSPF defines, including

internal, Area Border, and autonomous system boundary

router.

Summary Link update interval is 0:00:00 and the update is due in 0:00:00

An Area Border Router would transmit this link-state advertisement (LSA) into another area. Summarization occurs at the area border. As an internal router, this router is not capable of issuing this update.

External Link update interval is An autonomous system boundary router would transmit this

0:00:00 and the update due in 0:00:00 LSA into another routing protocol using redistribution. The update is external to the domain or AS. As an internal router, this router is not capable of issuing this update.

Specifies the number of areas of which this router is a member. As an internal router, it is configured for a single area and is a member of one area.

At a glance, it is possible to see how many of the router's interfaces are in an area and whether the router is using MD5 security. It is very useful to see the number of times that the SPF algorithm has been executed, because this is an indication of the network stability. The area ranges show any summarization that has been configured.

The default update timer for the LSA update timer is 30 minutes. This is used to ensure the integrity of the topological databases. This field shows when the next update is and that the default has not been changed. These update timers should be the same throughout the area.

Link State Age Interval is 00:20:00 This specifies the MAX-AGED update deletion interval and and due in 00:08:53 shows when the database will next be purged of out-of-date routes.

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