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17-2 timers spf delay intervalSyntax Description:
Purpose: When a change in the OSPF topology occurs, the OSPF process will run an SPF calculation. The delay parameter of this command sets the delay time between receipt of an OSPF topology change and the start of the SPF calculation. The interval parameter is the wait time between two SPF calculations. If the SPF calculation is being executed fre-quently, there may be a flapping interface in the network, causing OSPF to send frequent topology changes. Initial Cisco IOS Software Release: 10.3 Configuration Example: Modifying the LSA Group PacingThe SPF timers can be modified with the timers spf router configuration command, as shown in the following listing. Router A router ospf 1 log-adjacency-changes timers spf 8 16 network 1.1.1.1 0.0.0.0 area 1 network 10.1.1.0 0.0.0.3 area 0 VerificationThe SPF timer values can be verified with the show ip ospf command. rtrA# show ip ospf Routing Process "ospf 1" with ID 1.1.1.1 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 8 secs, Hold time between two SPFs 16 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 Area BACKBONE(0) Number of interfaces in this area is 1 Area has no authentication SPF algorithm executed 24 times Area ranges are Number of LSA 16. Checksum Sum 0x8759C 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 1 Number of interfaces in this area is 1 Area has no authentication SPF algorithm executed 12 times Area ranges are Number of LSA 3. Checksum Sum 0x14E8B 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 |
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