Chapter 29
| IP Routing Commands
Open Shortest Path First (OSPFv3)
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timers spf This command configures the delay after receiving a topology change and starting
the shortest path first (SPF) calculation, and the hold time between making two
consecutive SPF calculations. Use the no form to restore the default values.
Syntax
timers spf spf-delay spf-holdtime
no timers spf
spf-delay - The delay after receiving a topology change notification and
starting the SPF calculation. (Range: 0-2147483647 seconds)
spf-holdtime - The minimum time between two consecutive SPF
calculations. (Range: 0-2147483647 seconds)
Command Mode
Router Configuration
Default Setting
SPF delay: 5 seconds
SPF holdtime: 10 seconds
Command Usage
â—† Setting the SPF holdtime to 0 means that there is no delay between
consecutive calculations.
â—† Using a low value for the holdtime allows the router to switch to a new path
faster, but uses more CPU processing time.
Example
Console(config-router)#timers spf 20
Console(config-router)#
Route Metrics and Summaries
area default-cost This command specifies a cost for the default summary route sent into a stub from
an Area Border Router (ABR). Use the no form to remove the assigned default cost.
Syntax
area area-id default-cost cost
no area area-id default-cost
area-id - Identifies the stub. (The area ID can be in the form of an IPv4
address or as a four octet unsigned integer ranging from 0-4294967295.)
cost - Cost for the default summary route sent to a stub.
(Range: 0-16777215)
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