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Configuring IP Unicast Routing
Configuring Protocol-Independent Features
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 in the routing table to be connected 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's address in a static route,
the static route is also removed from the IP routing table.
DETAILED STEPS
Use the no ip route prefix mask {address | interface} global configuration command to remove a static route.
EXAMPLE
The following example shows how to choose an administrative distance of 110. In this case, packets for network 10.0.0.0
will be routed to a router at 172.31.3.4 if dynamic information with an administrative distance less than 110 is not
available.
ip route 10.0.0.0 255.0.0.0 172.31.3.4 110
Table 65 Default Administrative Distance Values
Route Source Default Distance
Connected interface 0
Static route 1
Enhanced IRGP summary route 5
External BGP 20
Internal Enhanced IGRP 90
IGRP 100
OSPF 110
Internal BGP 200
Unknown 225
Command Purpose
1. configure terminal Enter global configuration mode.
2. ip route prefix mask {address | interface}
[distance]
Establish a static route.
3. end Return to privileged EXEC mode.
4. show ip route Display the current state of the routing table to
verify the configuration.
5. copy running-config startup-config (Optional) Save your entries in the configuration
file.
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