Reference Guide

828 | Routing Information Protocol
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Generate a default route
Traffic is forwarded to the default route when the traffic’s network is not explicitly listed in the routing
table. Default routes are not enabled in RIP unless specified. Use the
default-information originate
command in the ROUTER RIP mode to generate a default route into RIP. In FTOS, default routes received
in RIP updates from other routes are advertised if the
default-information originate command is
configured.
To configure FTOS to generate a default route, use the following command in the ROUTER RIP mode:
Use the
show config command in the ROUTER RIP mode to confirm that the default route configuration
is completed.
Summarize routes
Routes in the RIPv2 routing table are summarized by default, thus reducing the size of the routing table
and improving routing efficiency in large networks. By default, the
autosummary command in the
ROUTER RIP mode is enabled and summarizes RIP routes up to the classful network boundary.
If you must perform routing between discontiguous subnets, disable automatic summarization. With
automatic route summarization disabled, subnets are advertised.
The command
autosummary requires no other configuration commands. To disable automatic route
summarization, in the ROUTER RIP mode, enter
no autosummary.
Control route metrics
As a distance-vector protocol, RIP uses hop counts to determine the best route, but sometimes the shortest
hop count is a route over the lowest-speed link. To manipulate RIP routes so that the routing protocol
prefers a different route, you must manipulate the route by using the
offset command.
Exercise caution when applying an
offset command to routers on a broadcast network, as the router using
the
offset command is modifying RIP advertisements before sending out those advertisements.
Command Syntax Command Mode Purpose
default-information originate
[always] [metric value] [route-map
route-map-name]
ROUTER RIP Specify the generation of a default route in RIP.
Configure the following parameters:
• always: enter this keyword to always generate a
default route.
• value range: 1 to 16.
• route-map-name: name of a configured route
map.
Note: If the ip split-horizon command is enabled on an interface, then the system does not advertise the
summarized address.