Asante Technologies 35516 Change the Ospf Administrative Distances, Monitor and Maintain Ospf

To force the autonomous system boundary router to generate a default route, perform the following task in router configuration mode.

Command	Purpose
redistribute {kernel connected static	Redistribute routes into OSPF routing
rip bgp} [metric metric-value][metric-	domain.
type {12}][route-map map-tag]

5.7.16 Change the OSPF Administrative Distances

An administrative distance is a value that rates the trustworthiness of a routing information source, such as an individual router or a group of routers. Numerically, an administrative distance is an integer between 0 and 255. The higher the value, the lower the trust rating. An administrative distance of 255 means the routing information source cannot be trusted at all and should be ignored.

OSPF uses three different administrative distances: intra-area, inter-area, and external. Routes learned through other domains are external, routes to another area in OSPF domain are inter-area, and routes inside an area are intra-area. The default distance for each type of route is 110.

To change any of the OSPF distance values, use the following command in router configuration mode.

Command	Purpose
distance ospf {external distance1 inter-area	Change the OSPF administrative distance
distance2 intra-areadistance2}	values.

5.7.17 Suppress Routes on an Interface

The interface specified as passive appears as a stub network in the OSPF domain. OSPF routing information is neither sent nor received through that specified router interface.

To suppress routes on a specified interface, use the following command in router configuration mode.

Command	Purpose
passive-interface interface-name	Suppress the sending of routes through the
	specified interface.

5.7.18 Prevent Routes from being Advertised in Routing Updates

To prevent other routers from learning one or more routes, the user can suppress routes from being advertised in routing updates. Note that this feature applies only to external routes.

To suppress routes from being advertised in routing updates, perform the following task in router configuration mode.

Command	Purpose
distribute-list list-nameout {bgp	Permit or deny routes from being advertised in
connected kernel rip static}	routing updates, depending upon the action
	listed in the access list.

5.7.19 Monitor and Maintain OSPF

The user can display specific statistics such as the contents of IP routing tables and databases. The information provided can be used to determine resource utilization and solve network problems. The user can also display information about node availability and discover the routing path that packets are taking through the network.

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