Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 681)

Multi-Service IronWare Routing Configuration Guide 653
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Configuring OSPFv3
• 2 – Type 2 external route
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 are used even if you do not use the always option.
To disable default route origination, enter the no form of the command.
Modifying Shortest Path First timers
The device uses the following timers when calculating the shortest path for OSPFv3 routes:
• SPF delay – When the device receives a topology change, the software waits before it starts a
Shortest Path First (SPF) calculation. By default, the software waits 5 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 device waits a specific amount of time between consecutive SPF
calculations. By default, it waits 10 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 SPF delay and hold time to lower values to cause the device to change to alternate
paths more quickly if a route fails. Note that lower values for these parameters require more CPU
processing time.
You can change one or both of the timers.
NOTE
If you want to change only one of the timers, for example, the SPF delay timer, you must specify the
new value for this timer as well as the current value of the SPF hold timer, which you want to retain.
The device does not accept only one timer value.
NOTE
If you configure SPF timers between 0-100, they will default to 0 and be displayed incorrectly in the
running configuration.
To change the SPF delay to 10 seconds and the SPF hold to 20 seconds, enter the following
command.
Brocade(config-ospf6-router)# timers spf 10 20
Syntax: timers spf delay hold-time
For the delay and hold-time parameters, specify a value from 0 – 65535 seconds.
To set the timers back to their default values, enter the no version of this command.
Modifying administrative distance
The device can learn about networks from various protocols, including BGP4+, IPv6 IS-IS, RIPng,
and OSPFv3. Consequently, the routes to a network may differ depending on the protocol from
which the routes were learned. By default, the administrative distance for OSPFv3 routes is 110.