Specifying Default Routes And Networks - Cisco WS-CBS3032-DEL Software Configuration Manual

Configuring Protocol-Independent Features
Command
Step 3
end
Step 4
show ip route
Step 5 copy running-config startup-config
Use the no ip route prefix mask {address | interface} global configuration command to remove a static
route.
The switch retains static routes until you remove them. However, you can override static routes with
dynamic routing information by assigning administrative distance values. Each dynamic routing
protocol has a default administrative distance, as listed in
overridden by information from a dynamic routing protocol, set the administrative distance of the static
route higher than that of the dynamic protocol.
Table 39-16
Route Source
Connected interface
Static route
Enhanced IRGP summary route
External BGP
Internal Enhanced IGRP
IGRP
OSPF
Internal BGP
Unknown
Static routes that point to an interface are advertised through RIP, IGRP, and other dynamic routing
protocols, whether or not static redistribute router configuration commands were specified for those
routing protocols. These static routes are advertised because static routes that point to an interface are
considered as connected in the routing table and hence lose their static nature. However, if you define a
static route to an interface that is not one of the networks defined in a network command, no dynamic
routing protocols advertise the route unless a redistribute static command is specified for these
protocols.
When an interface goes down, all static routes through that interface are removed from the IP routing
table. When the software can no longer find a valid next hop for the address specified as the
forwarding-router address in a static route, the static route is also removed from the IP routing table.

Specifying Default Routes and Networks

A router might not be able to learn the routes to all other networks. To provide complete routing
capability, you can use some routers as smart routers and give the remaining routers default routes to the
smart router. (Smart routers have routing table information for the entire internetwork.) These default
routes can be dynamically learned or can be configured in the individual routers. Most dynamic interior
routing protocols can cause a smart router to generate dynamic default information that is then forwarded
to other routers.
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
39-98
Dynamic Routing Protocol Default Administrative Distances
Default Distance
0
1
5
20
90
100
110
200
225
Chapter 39
Purpose
Return to privileged EXEC mode.
Display the routing table to verify the configuration.
(Optional) Save your entries in the configuration file.
Table 39-16. If you want a static route to be
Configuring IP Unicast Routing
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