116 CHAPTER 6: IP ROUTING PROTOCOL OPERATION
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 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.
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, and the other follows RFC2082.
Perform the following configuration in Interface View:
The usual packet format follows RFC1723 and nonstandard follows RFC2082.
Configuring Split Horizon
Split horizon means that the route received through an interface will not be sent
through this interface again. The split horizon algorithm can reduce the
Table 112 Enabling Route Aggregation
Operation Command
Activate the automatic aggregation function of RIP-2 summary
Disable the automatic aggregation function of RIP-2 undo summary
Table 113 Setting RIP-2 Packet Authentication
Operation Command
Configure RIP-2 simple authentication key rip authentication-mode simple
password_string
Configure RIP-2 MD5 authentication with
packet type following RFC 1723
rip authentication-mode md5 usual
key_string
Configure RIP-2 MD5 authentication with
packet type following RFC 2082
rip authentication-mode md5
nonstandard key_string key_id
Cancel authentication of RIP-2 packet undo rip authentication-mode
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