Brocade BigIron RX Series Configuration Guide - Manual (Page 865)

BigIron RX Series Configuration Guide 787
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Configuring OSPF
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• External routes
The default for all these OSPF route types is 110.
NOTE
This feature does not influence the choice of routes within OSPF. For example, an OSPF intra-area
route is always preferred over an OSPF inter-area route, even if the intra-area route’s distance is
greater than the inter-area route’s distance.
To change the default administrative distances for inter-area routes, intra-area routes, and external
routes, enter the following command.
BigIron RX(config-ospf-router)# distance external 100
BigIron RX(config-ospf-router)# distance inter-area 90
BigIron RX(config-ospf-router)# distance intra-area 80
Syntax: distance external | inter-area | intra-area <distance>
The external | inter-area | intra-area parameter specifies the route type for which you are changing
the default administrative distance.
The <distance> parameter specifies the new distance for the specified route type. Unless you
change the distance for one of the route types using commands such as those shown above, the
default is 110.
To reset the administrative distance to its system default (110), enter a command such as the
following.
BigIron RX(config-ospf-router)# no distance external 100
Configure OSPF group Link State Advertisement pacing
The BigIron RX paces LSA refreshes by delaying the refreshes for a specified time interval instead
of performing a refresh each time an individual LSA’s refresh timer expires. The accumulated LSAs
constitute a group, which the BigIron RX refreshes and sends out together in one or more packets.
The pacing interval, which is the interval at which the device refreshes an accumulated group of
LSAs, is configurable to a range from 10 – 1800 seconds (30 minutes). The default is 240 seconds
(four minutes). Thus, every four minutes, the device refreshes the group of accumulated LSAs and
sends the group together in the same packets.
Usage guidelines
The pacing interval is inversely proportional to the number of LSAs the device is refreshing and
aging. For example, if you have approximately 10,000 LSAs, decreasing the pacing interval
enhances performance. If you have a very small database (40 – 100 LSAs), increasing the pacing
interval to 10 – 20 minutes might enhance performance slightly.
Changing the LSA pacing interval
To change the LSA pacing interval, use the following CLI method.
To change the LSA pacing interval to two minutes (120 seconds), enter the following command.
BigIron RX(config-ospf-router)# timers lsa-group-pacing 120
Syntax: [no] timers lsa-group-pacing <secs>