NOTE
This feature does not inuence 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.
device(config-ospf-router)# distance external 100
device(config-ospf-router)# distance inter-area 90
device(config-ospf-router)# distance intra-area 80
Syntax: [no] distance { external | inter-area | intra-area } distance
The distance external, inter-area , and intra-area parameters specify the route type for which you are changing the default administrative
distance.
The distance parameter species the new distance for the specied 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.
device(config-ospf-router)# no distance external 100
Congure OSPF group LSA pacing
The device paces Link State Advertisement (LSA) refreshes by delaying the refreshes for a specied time interval instead of performing a
refresh each time an individual LSA refresh timer expires. The accumulated LSAs constitute a group, which the device 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 congurable 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.
device(config-ospf-router)# timers lsa-group-pacing 120
Syntax: [no] timers lsa-group-pacing secs
The secs parameter
species the number of seconds and can be from 10 - 1800 (30 minutes). The default is 240 seconds (four
minutes).
To restore the pacing interval to its default value, enter the following command.
device(config-ospf-router)# no timers lsa-group-pacing
OSPF distribute list
FastIron Ethernet Switch Layer 3 Routing
264 53-1003627-04
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