3com 3031 Instruccion De Instalación

C

HAPTER

 39: RIP C

ONFIGURATION

By default, RIP will not filter the received and imported routing information.

For more information, refer to the “Configuring Route Filtering” in Chapter 43 “IP 
Routing Policy Configuration”.

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 host route is disabled, a router can refuse a host route 
it receives.

Perform the following in the RIP View.

By default, the router receives the host route.

The so-called route aggregation 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 aggregation can be 
performed to reduce the routing traffic on the network as well as to reduce the 
size of the routing table.

RIP-1 only sends the route with natural mask, that is, it always sends routes in the 
route aggregation form. RIP-2 supports classless inter-domain routing (CIDR). To 
advertise all the subnet routes, the route aggregation function of RIP-2 can be 
disabled.

Perform the following in the RIP View.

Cancel the filtering of the received 
routing information imported by the 
specified address

undo filter-policy gateway 
ip-prefix-name import

Filter the received global routing 
information

filter-policy { acl-number | ip-prefix 
ip-prefix-name } import

Cancel the filtering of the received 
global routing information

undo filter-policy { acl-number  | 
ip-prefix ip-prefix-name } import

Table 549   Configuring RIP to filter the imported routes

Filter the imported routing 
information

filter-policy { acl-number | ip-prefix  
ip-prefix-name } export [ routing-protocol ] 

Cancel the filtering of the 
imported routing information

undo filter-policy { acl-number  | ip-prefix 
ip-prefix-name } export [ routing-protocol ] 

Table 548   Configuring RIP to filter the received routes

Table 550   Disabling host route

Enable host route receiving

Disable host route receiving