3Com Switch 8800 Family Configuration Guide

296 CHAPTER 30: RIP CONFIGURATION
Configuring RIP to filter the routes advertised by RIP
By default, RIP does not filter the received and advertised routing information.
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■ The filter-policy import command filters the RIP routes received from its
neighbors, and the routes that fail to pass the filter will not be added to the
routing table, and will not be advertised to the neighbors.
■ The filter-policy export command filters all the advertised routes, including
routes imported by the import-route command, and RIP routes learned from
the neighbors.
■ If the filter-policy export command does not specify which route to be
filtered, then all the routes imported by the import-route command and the
advertised RIP routes will be filtered.
Disabling RIP to Receive
Host Route
In some special cases, the router can receive a lot of host routes, and these routes
are of little help in route addressing but consume a lot of network resources.
Routers can be configured to reject host routes by using the undo host-route
command.
Perform the following configuration in RIP view.
By default, the router receives the host route.
Configuring RIP-2 Route
summary Function
The so-called route summary means that different subnet routes in the same
natural network can be aggregated into one natural mask route for transmission
when they are sent to the outside (i.e. other network). Route summary can be
performed to reduce the routing traffic on the network as well as to reduce the
size of the routing table.
Configure RIP to filter the received global
routing information
filter-policy { acl-number | ip-prefix
ip-prefix-name } import
Cancel filtering the received global routing
information
undo filter-policy { acl-number | ip-prefix
ip-prefix-name } import
Tabl e 260 Configure RIP to filter the advertised routes
Operation Command
Configure RIP to filter the advertised routing
information
filter-policy { acl-number | ip-prefix
ip-prefix-name } export [ routing-protocol ]
Cancel filtering the advertised routing
information
undo filter-policy { acl-number | ip-prefix
ip-prefix-name } export [ routing-protocol ]
Table 259 Configure RIP to filter the received routes
Operation Command
Tabl e 261 Enable/disable host route receiving
Operation Command
Enable the route to receive host route host-route
Disable the router from receiving host route undo host-route