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230 CHAPTER 16: IP ROUTING PROTOCOL OPERATION
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 generation of
routing loops, but in some special cases, split horizon must be disabled to obtain
correct advertising at the cost of efficiency. Disabling split horizon has no effect on
P2P connected links but is applicable on the Ethernet.
Perform the following configuration in Interface View:
By default, split horizon is enabled.
Enabling RIP to Import Routes of Other Protocols
RIP allows users to import the route information of other protocols into the routing
table.
RIP can import routes from protocols including direct, static and OSPF.
Perform the following configurations in RIP View.
By default, RIP does not import the route information of other protocols.
Configuring the Default Cost for the Imported Route
When you use the import-route command to import the routes of other protocols,
you can specify their cost. If you do not specify the cost of the imported route, RIP will
set the cost to the default cost, specified by the
default cost parameter.
Table 211 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
Table 212 Configuring Split Horizon
Operation Command
Enable split horizon rip split-horizon
Disable split horizon undo rip split-horizon
Table 213 Enabling RIP to Import Routes of Other Protocols
Operation Command
Enable RIP to import routes of other
protocols
import-route protocol [ cost value ] [
route-policy route_policy_name ]
Disable route imports from other
protocols
undo import-route protocol