C
HAPTER
19
| Unicast Routing
Configuring the Routing Information Protocol
– 675 –
n
Do Not Receive: Does not accept incoming RIP packets. This
option does not add any dynamic entries to the routing table for an
interface.
The default depends on the setting for the Global RIP Version. (See
"Configuring General Protocol Settings" on page 661.)
u Authentication Type – Specifies the type of authentication required
for exchanging RIPv2 protocol messages. (Default: No Authentication)
n
No Authentication: No authentication is required.
n
Simple Password: Requires the interface to exchange routing
information with other routers based on an authorized password.
(Note that authentication only applies to RIPv2.)
n
MD5: Message Digest 5 (MD5) authentication.
MD5 is a one-way hash algorithm is that takes the authentication
key and produces a 128 bit message digest or “fingerprint.” This
makes it computationally infeasible to produce two messages
having the same message digest, or to produce any message
having a given pre-specified target message digest.
u Authentication Key – Specifies the key to use for authenticating
RIPv2 packets. For authentication to function properly, both the
sending and receiving interface must use the same password.
(Range: 1-16 characters, case sensitive)
u Instability Prevention – Specifies the method used to reduce the
convergence time when the network topology changes, and to prevent
RIP protocol messages from looping back to the source router.
n
Split Horizon – This method never propagate routes back to an
interface from which they have been acquired.
n
Poison Reverse – This method propagates routes back to an
interface from which they have been acquired, but sets the
distance-vector metrics to infinity. This provides faster
convergence. (This is the default setting.)
n
None – No loopback prevention method is employed. If a loop
occurs without using any prevention method, the hop count for a
route may be gradually incremented to infinity (that is, 16) before
the route is deemed unreachable.
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