3Com 10014298 manual Disabling Host Route, By default, the router receives the host route

94CHAPTER 5: IP ROUTING PROTOCOL OPERATION

By default, all interfaces except loopback interfaces both receive and transmit RIP update packets.

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-routecommand.

Perform the following configurations in RIP view.

Table 90 Disabling Host Routes

Operation	Command
Enable receiving host routes	host-route
Disable receiving host routes	undo host-route

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 91 Enabling Route Aggregation

Operation	Command
Enable the automatic aggregation function of	summary
RIP-2
Disable the automatic aggregation function of	undo summary
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