3Com 5500-EI PWR Install Manual page 279

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 the command is invalid for any route imported to RIP from other
routing protocols.
Configuring RIP route summarization
Rip route summarization means that when the router advertises RIP updates, different subnet routes in
the same natural network segment can be aggregated into one route with a natural mask for
transmission to another network segment. This function is used to reduce the routing traffic on the
network as well as the size of the routing table.
When it is necessary to advertise RIP route updates in a subnet, disable the route summarization for
RIP-2.
Follow these steps to configure RIP route summarization:
To do...
Enter system view
Enter RIP view
Enable RIP-2 automatic
route summarization
Disabling the router from receiving host routes
In some special cases, the router can receive a lot of host routes from the same segment, and these
routes are of little help in route addressing but consume a lot of network resources. After a router is
disabled from receiving host routes, it can refuse any incoming host route.
Follow these steps to disable the router from receiving host routes:
To do...
Enter system view
Enter RIP view
Disable the router from
receiving host routes
Configuring RIP to filter incoming/outgoing routes
The route filtering function provided by a router enables you to configure inbound/outbound filter policy
by specifying an ACL, address prefix list, or route policy to make RIP filter incoming/outgoing routes.
Besides, you can configure RIP to receive only the RIP packets from a specific neighbor.
Use the command...
system-view
rip
summary
Use the command...
system-view
rip
undo host-route
3-6
Remarks
—
—
Required
Enabled by default
Remarks
—
—
Required
By default, the router receives
host routes.