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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 |
rip | bgp} [metric metric-value] [metric-
type {1|2}][route-map
map-tag]
Redistribute routes into OSPF routing
domain.
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
distance2 | intra-area distance2}
Change the OSPF administrative distance
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-name
out {bgp |
connected | kernel | rip | static}
Permit or deny routes from being advertised in
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.