Brocade Communications Systems FastIron SX 1600 Configuration Manual Download

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Modifying administrative distance

The Brocade device can learn about networks from various protocols, including BGP4+, 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.

The device selects one route over another based on the source of the route information. To do so, the device can use the administrative
distances assigned to the sources. You can influence the device’s decision by changing the default administrative distance for OSPFv3
routes.

Configuring administrative distance based on route type

You can configure a unique administrative distance for each type of OSPFv3 route. For example, you can use this feature to influence the
Brocade device to prefer a static route over an OSPF inter-area route and to prefer OSPF intra-area routes to static routes.

The distance you specify influences the choice of routes when the device has multiple routes to 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 OSPFv3 route types:

•

Intra-area routes

•

Inter-area routes

•

External routes

The default for all of these OSPFv3 route types is 110.

NOTE

This feature does not influence the choice of routes within OSPFv3. 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.

For example, to change the default administrative distances for intra-area routes to 80, inter-area routes to 90, and external routes to
100, enter the following commands.

device(config-ospf6-router)# distance intra-area 80

device(config-ospf6-router)# distance inter-area 90

device(config-ospf6-router)# distance external 100

Syntax:

[no] distance

{

external

inter-area

intra-area

}

distance

The

external

inter-area

, and

intra-area

keywords specify the route type for which you are changing the default administrative distance.

The

distance

parameter specifies the new distance for the specified route type. You can specify a value from 1 through 255.

To reset the administrative distance of a route type to its system default, enter the

form of this command.

Configuring the OSPFv3 LSA pacing interval

The Brocade device paces OSPFv3 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 device refreshes and sends out
together in one or more packets.

The pacing interval, which is the interval at which the Brocade device 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 device refreshes
the group of accumulated LSAs and sends the group together in the same packets.

Brocade Communications Systems FastIron SX 1600, Configuration Manual

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