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DES-7200 Configuration Guide Chapter 4 OSPF
Configuration
4-18
area is referred to as the inter-area route. A route to another area (learnt through
redistribution) is known as the external route.
To change the OSPF management distance, execute the following commands in
the routing process configuration mode:
Command Function
DES-7200(config-router)# distance ospf
{[inter-area dist1] [inner-area dist2]
[external dist3]}
Change the OSPF management
distance.
4.2.11 Configuring the Route Calculation Timer
When the OSPF routing process receives the route topology change notification,
it runs the SPF for route calculation after some time of delay. This delay can be
configured, and you can also configure the minimum intervals between two SPF
calculations.
To configure the OSPF route calculation timer, execute the following commands
in the routing process configuration mode:
Command Function
DES-7200 (config-router)#timers throttle
spf spf-delay spf-holdtime
spf-max-waittime
Configure the route calculation timer.
Note
Spf-delay refers to the delay time from the topology change to SPF calculation.
Spf-holdtime refers to the minimum time interval between two SPF calculations.
The time interval of the consecutive SPF calculations shall at least be twice as
the last time interval till the time interval reaches spf-max-waittime. If the time
interval between two SPF calculations has exceeded the minimum value, then it
starts over from the spf-holdtime value to calculate the SPF time interval.
Normally, reducing the value of spf-delay and spf-holdtime could speed up the
OSPF convergence if the link turbulence occurs occasionally. Setting the
spf-max-waittime value can avoid the CPU consumption by the OSPF due to
the consecutive link turbulence.
For example: timers throttle spf 1000 5,000 100,000. If the topology changes,
the SPF calculations are in the ascend order as follows and do not exceed the
spf-max-waittime(100,000): 1s，6s，16s，36s，76s，156s，256s，256+100，…
To configure the OSPF route delay time and holdtiime, execute the following
commands in the routing process configuration mode: