OS10 Enterprise Edition User Guide Release


timers spf

Enables shortest path first (SPF) throttling to delay an SPF calculation when a topology change occurs.

timers spf [ start-time [ hold-time [ max-wait]]]
  • start-time — Sets the initial SPF delay in milliseconds (1 to 600000; default 1000).
  • hold-time — Sets the additional hold time between two SPF calculations in milliseconds (1 to 600000; default 10000).
  • max-wait — Sets the maximum wait time between two SPF calculations in milliseconds (1 to 600000; default 10000).
  • start-time — 1000 milliseconds
  • hold-time — 10000 milliseconds
  • max-wait — 10000 milliseconds
Command Mode
Usage Information
By default, SPF timers are disabled in an OSPF instance.
Use SPF throttling to delay SPF calculations during periods of network instability. In an OSPF network, a topology change event triggers an SPF calculation after a start time. When the start timer finishes, a hold time may delay the next SPF calculation for an additional time. When the hold timer is running:
  • Each time a topology change occurs, the SPF calculation is delayed for double the configured hold time up to maximum wait time.
  • If no topology change occurs, an SPF calculation is performed and the hold timer is reset to its configured value.

If you do not specify a start-time, hold-time or max-wait value, the default values are used. The no version of this command removes the configured SPF timers and disables SPF throttling in an OSPF instance.

OS10(config)# router ospf 100
                                       OS10(config-router-ospf-100)# timers spf 1200 2300 3400
                                       OS10(config-router-ospf-100)# do show ip ospf
                                       Routing Process ospf 100 with ID
                                       Supports only single TOS (TOS0) routes
                                       It is Flooding according to RFC 2328
                                       SPF schedule delay 1200 msecs, Hold time between two SPFs 2300 msecs
                                       Convergence Level 0
                                       Min LSA origination 0 msec, Min LSA arrival 1000 msec
                                       Min LSA hold time 5000 msec, Max LSA wait time 5000 msec
                                       Number of area in this router is 1, normal 1 stub 0 nssa 0
                                       Area (
                                       Number of interface in this area is 1
                                       SPF algorithm executed 1 times
Supported Releases
10.4.0E(R1) or later

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