Dell PowerConnect B-FCXs, Руководство по настройке

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960 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Configuring OSPF
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Inter-area routes
•
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 distance is
greater than the inter-area route distance.
To change the default administrative distances for inter-area routes, intra-area routes, and external
routes, enter the following command.
PowerConnect(config-ospf-router)#distance external 100
PowerConnect(config-ospf-router)#distance inter-area 90
PowerConnect(config-ospf-router)#distance intra-area 80
Syntax: [no] 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.
PowerConnect(config-ospf-router)#no distance external 100
Configuring OSPF group Link State Advertisement
(LSA) pacing
The Layer 3 Switch paces LSA refreshes by delaying the refreshes for a specified time interval
instead of performing a refresh each time an individual LSA refresh timer expires. The
accumulated LSAs constitute a group, which the Layer 3 Switch refreshes and sends out together
in one or more packets.
The pacing interval, which is the interval at which the Layer 3 Switch refreshes an accumulated
group of LSAs, is configurable to a range from 10 through 1800 seconds (30 minutes). The default
is 240 seconds (four minutes). Thus, every four minutes, the Layer 3 Switch 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 Layer 3 Switch 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 to 100 LSAs), increasing the pacing
interval to 10 to 20 minutes might enhance performance slightly.
Changing the LSA pacing interval
To change the LSA pacing interval to two minutes (120 seconds), enter the following command.
PowerConnect(config-ospf-router)#timers lsa-group-pacing 120