Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 230)

202 Multi-Service IronWare Routing Configuration Guide
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Adding additional parameters
Configuring administrative distance based on route type
You can configure a unique administrative distance for each type of OSPF route. For example, you
can use this feature to prefer a static route over an OSPF inter-area route but you also want to
prefer OSPF intra-area routes to static routes.
The distance you specify influences the choice of routes when the device has multiple routes for
the same network from different protocols. The device prefers the route with the lower
administrative distance.
You can specify unique default administrative distances for the following route types:
• Intra-area routes
• 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’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.
Brocade(config-ospf-router)# distance external 100
Brocade(config-ospf-router)# distance inter-area 90
Brocade(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.
Brocade(config-ospf-router)# no distance external 100
Configure OSPF group Link State Advertisement
(LSA) pacing
The device 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 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 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.