3Com Switch 7750 Configuration Guide Guide

RIP Route Control 279
RIP Route Control In actual implementation, it may be needed to control RIP routing information
more accurately to accommodate complex network environments. By performing
the configuration described in the following sections, you can:
■ Control route selection by adjusting additional routing metrics on interfaces
running RIP.
■ Reduce the size of the routing table by setting route summary and disabling
the receiving of host routes.
■ Filter the received routes.
■ Set the preference of RIP to change the preference order of routing protocols.
This order makes sense when more than one route to the same destination is
discovered by multiple routing protocols.
■ Speed up packet forwarding by enabling RIP traffic sharing across interfaces
■ Import external routes in an environment with multiple routing protocols and
filter the advertised routes.
Configuration
Prerequisites
Before configuring RIP route control, perform the following tasks:
■ Configuring network layer addresses of interfaces so that adjacent nodes are
reachable to each other at the network layer
■ Configuring basic RIP functions
Configuring RIP Route
Control
Setting the additional routing metrics of an interface
Additional routing metric is the routing metric (hop count) added to the original
metrics of RIP routes on an interface. It does not change the metric value of a RIP
route in the routing table, but will be added for incoming or outgoing RIP routes
on the interface.
n
The rip metricout command takes effect only on the RIP routes learnt by the
router and the RIP routes generated by the router itself, but not on any route
imported to RIP from other routing protocols.
Table 199 Set additional routing metric
Operation Command Description
Enter system view system-view -
Enter interface view
interface interface-type
interface-number
-
Set the additional routing
metric to be added for
incoming RIP routes on this
interface
rip metricin value
Optional
By default, the additional
routing metric added for
incoming routes on an
interface is 0.
Set the additional routing
metric to be added for
outgoing RIP routes on this
interface
rip metricout value
Optional
By default, the additional
routing metric added for
outgoing routes on an
interface is 1.