VPRN Service Configuration Commands
Page 1098 7750 SR OS Services Guide
The default interface cost is calculated as follows:
The default reference-bandwidth is
100,000,000 Kbps or 100 Gbps, so the default auto-cost metrics for
various link speeds are as as follows:
• 10 Mbs link default cost of 10000
• 100 Mbs link default cost of 1000
• 1 Gbps link default cost of 100
• 10 Gbps link default cost of 10
The reference-bandwidth command assigns a default cost to the interface based on the interface
speed. To override this default cost on a particular interface, use the metric metric command in the
config>router>ospf>area>interface ip-int-name context.
The no form of the command reverts the reference-bandwidth to the default value.
Default reference-bandwidth 100000000 — Reference bandwidth of 100 Gbps.
Parameters reference-bandwidth — The reference bandwidth in kilobits per second expressed as a decimal
integer.
Values 1 — 1000000000
timers
Syntax timers
Context config>service>vprn>ospf
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
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
cost reference-bandwidth bandwidth÷=
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