Virtual Private Routed Network Services
7750 SR OS Services Guide Page 1409
timers
Syntax timers
Context config>service>vprn>ospf
config>service>vprn>ospf3
Description This command enables the context that allows for the configuration of OSPF timers. Timers control
the delay between receipt of a link state advertisement (LSA) requiring a Dijkstra (Shortest Path First
(SPF)) calculation and the minimum time between successive SPF calculations.
Changing the timers affect CPU utilization and network reconvergence times. Lower values reduce
convergence time but increase CPU utilization. Higher values reduce CPU utilization but increase
reconvergence time.
Default none
spf-wait
Syntax spf-wait max-spf-wait [spf-initial-wait [spf-second-wait]]
no spf-wait
Context config>service>vprn>ospf>timers
config>service>vprn>ospf3>timers
Description This command defines the maximum interval between two consecutive SPF calculations in
milliseconds. Timers that determine when to initiate the first, second, and subsequent SPF
calculations after a topology change occurs can be controlled with this command. Subsequent SPF
runs (if required) will occur at exponentially increasing intervals of the spf-second-wait interval. For
example, if the spf-second-wait interval is 1000, then the next SPF will run after 2000 milliseconds,
and then next SPF will run after 4000 milliseconds, etc., until it reaches the spf-wait value. The SPF
interval will stay at the spf-wait value until there are no more SPF runs scheduled in that interval.
After a full interval without any SPF runs, the SPF interval will drop back to spf-initial-wait.
The timer must be entered in increments of 100 milliseconds. Values entered that do not match this
requirement will be rejected.
Use the no form of this command to return to the default.
Default no spf-wait
Parameters max-spf-wait — Specifies the maximum interval in milliseconds between two consecutive SPF
calculations.
Values 1 — 120000
Default 1000
spf-initial-wait — Specifies the initial SPF calculation delay in milliseconds after a topology change.
Values 10 — 100000
Default 1000
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