Brocade TurboIron 24X Series Configuration Guide - Manual (Page 674)

640 Brocade TurboIron 24X Series Configuration Guide
53-1003053-01
Configuring OSPF
If you do not use this option, the default redistribution metric type is used for the route type.
NOTE
If you specify a metric and metric type, the values you specify are used even if you do not use the
always option.
Modify SPF timers
The Layer 3 Switch uses the following timers when calculating the shortest path for OSPF routes:
• SPF delay – When the Layer 3 Switch receives a topology change, the software waits before it
starts a Shortest Path First (SPF) calculation. By default, the software waits five seconds. You
can configure the SPF delay to a value from 0 – 65535 seconds. If you set the SPF delay to 0
seconds, the software immediately begins the SPF calculation after receiving a topology
change.
• SPF hold time – The Layer 3 Switch waits for a specific amount of time between consecutive
SPF calculations. By default, the Layer 3 Switch waits ten seconds. You can configure the SPF
hold time to a value from 0 – 65535 seconds. If you set the SPF hold time to 0 seconds, the
software does not wait between consecutive SPF calculations.
You can set the delay and hold time to lower values to cause the Layer 3 Switch to change to
alternate paths more quickly in the event of a route failure. Note that lower values require more
CPU processing time.
You can change one or both of the timers. To do so, enter commands such as the following.
TurboIron(config-ospf-router)#timers spf 10 20
The command in this example changes the SPF delay to 10 seconds and changes the SPF hold
time to 20 seconds.
Syntax: timers spf <delay> <hold-time>
The <delay> parameter specifies the SPF delay.
The <hold-time> parameter specifies the SPF hold time.
To set the timers back to their default values, enter a command such as the following.
TurboIron(config-ospf-router)#no timers spf 10 20
Modify redistribution metric type
The redistribution metric type is used by default for all routes imported into OSPF unless you
specify different metrics for individual routes using redistribution filters. Type 2 specifies a big
metric (three bytes). Type 1 specifies a small metric (two bytes). The default value is type 2.
To modify the default value to type 1, enter the following command.
TurboIron(config-ospf-router)#metric-type type1
Syntax: metric-type type1 | type2
The default is type2.