Blade ICE RACKSWITCH G8124-E - Manual (Page 246)

BLADEOS 6.5.2 Application Guide
246 Chapter 17: Routing Information Protocol BMD00220, October 2010
Default
The RIP router can listen and supply a default route, usually represented as IPv4 0.0.0.0 in the
routing table. When a router does not have an explicit route to a destination network in its routing
table, it uses the default route to forward those packets.
Metric
The metric field contains a configurable value between 1 and 15 (inclusive) which specifies the
current metric for the interface. The metric value typically indicates the total number of hops to the
destination. The metric value of 16 represents an unreachable destination.
Authentication
RIPv2 authentication uses plaintext password for authentication. If configured using Authentication
password, then it is necessary to enter an authentication key value.
The following method is used to authenticate a RIP message:
If the router is not configured to authenticate RIPv2 messages, then RIPv1 and unauthenticated
RIPv2 messages are accepted; authenticated RIPv2 messages are discarded.
If the router is configured to authenticate RIPv2 messages, then RIPv1 messages and RIPv2
messages which pass authentication testing are accepted; unauthenticated and failed
authentication RIPv2 messages are discarded.
For maximum security, RIPv1 messages are ignored when authentication is enabled; otherwise, the
routing information from authenticated messages is propagated by RIPv1 routers in an
unauthenticated manner.