3Com Switch 7700 Configuration Manual page 108

100 C 5: IP R
HAPTER OUTING
P O
ROTOCOL PERATION
Disabling Host Route
In some cases, the router can receive many host routes from the same segment,
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 undo
host-route command.
Perform the following configurations in RIP view.
Table 13 Disabling Host Routes
Operation
Enable receiving host routes
Disable receiving host routes
By default, the router receives the host route.
Enabling RIP-2 Route Aggregation
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 other outside networks. 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 routes with natural mask, that is, it always sends routes in the
route aggregation form.
RIP-2 supports subnet mask and classless inter-domain routing. To advertise all the
subnet routes, the route aggregation function of RIP-2 can be disabled.
Perform the following configurations in RIP view.
Table 14 Enabling Route Aggregation
Operation
Enable the automatic aggregation function of
RIP-2
Disable the automatic aggregation function of
RIP-2
By default, RIP-2 uses the route aggregation function.
Setting RIP-2 Packet Authentication
RIP-1 does not support packet authentication. However, you can configure packet
authentication on RIP-2 interfaces.
RIP-2 supports two authentication modes:
Simple authentication — This mode does not ensure security. The key is not
■
encrypted and can be seen in a network trace so simple authentication should
not be applied when there are high security requirements
MD5 authentication — This mode uses two packet formats: One format
■
follows RFC1723 (RIP Version 2 Carrying Additional Information); the other
format follows RFC2082 (RIP-2 MD5 Authentication).
Command
host-route
undo host-route
Command
summary
undo summary