Cisco Cisco IOS Software Release 12.4(15)T

OSPF Mechanism to Exclude Connected IP Prefixes from LSA Advertisements

Configuration Examples for the OSPF Mechanism to Exclude Connected IP Prefixes from LSA Advertisements

Cisco IOS Release 12.4(15)T

IP routing:

OSPF summary lsa generation debugging is on

Condition 1: interface Et0/0 (1 flags triggered)

Flags: Et0/0

Router# show logging

*Jun 5 21:54:47.295: OSPF: Suppressing 192.168.131.0/24 on Ethernet1/0 from router LSA

*Jun 5 21:54:52.355: OSPF: Suppressing 192.168.131.0/24 on Ethernet1/0 from router LSA

Configuration Examples for the OSPF Mechanism to Exclude
Connected IP Prefixes from LSA Advertisements

This section contains the following examples:

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Excluding IP Prefixes from LSA Advertisements for an OSPF Process: Example

The following example configures IP prefix suppression for OSPF routing process 23.

router ospf 23

prefix-suppression

end

When the show ip ospf command is entered, the displayed output verifies that IP prefix suppression has
been enabled for OSPF process 23.

Router# show ip ospf

outing Process "ospf 23" with ID 10.0.0.6

Start time: 00:00:04.912, Time elapsed: 00:02:35.184

Supports only single TOS(TOS0) routes

Supports opaque LSA

Supports Link-local Signaling (LLS)

Supports area transit capability

It is an area border router

Router is not originating router-LSAs with maximum metric

Initial SPF schedule delay 5000 msecs

Minimum hold time between two consecutive SPFs 10000 msecs

Maximum wait time between two consecutive SPFs 10000 msecs

Incremental-SPF disabled

Minimum LSA interval 5 secs

Minimum LSA arrival 1000 msecs

LSA group pacing timer 240 secs

Interface flood pacing timer 33 msecs

Retransmission pacing timer 66 msecs

Number of external LSA 2. Checksum Sum 0x0132C8

Number of opaque AS LSA 0. Checksum Sum 0x000000

Number of DCbitless external and opaque AS LSA 0

Number of DoNotAge external and opaque AS LSA 0