Advanced Configuration and Management Guide

6.Click the Apply button to save the change to the device’s running-config file.

7.Select the Save link at the bottom of the dialog. Select Yes when prompted to save the configuration change to the startup-config file on the device’s flash memory.

Modify Administrative Distance

HP routing switches can learn about networks from various protocols, including Border Gateway Protocol version 4 (BGP4), RIP, and OSPF. Consequently, the routes to a network may differ depending on the protocol from which the routes were learned. The default administrative distance for OSPF routes is 110. See “Changing Administrative Distances” on page 10-30for a list of the default distances for all route sources.

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

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 routing switch has multiple routes for the same network from different protocols. The routing switch 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 configure administrative distances for OSPF route types, use the following CLI method.

USING THE CLI

To change the default administrative distances for inter-area routes, intra-area routes, and external routes, enter the following command:

HP9300(config-ospf-router)# distance external 100

HP9300(config-ospf-router)# distance inter-area 90

HP9300(config-ospf-router)# distance intra-area 80

Syntax: distance external inter-area intra-area <distance>

The external inter-area intra-areaparameter 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:

HP9300(config-ospf-router)# no distance external 100

Configure OSPF Group Link State Advertisement (LSA) Pacing

The routing switch 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 routing switch refreshes and sends out together in one or more packets.

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