Rip Features - Lenovo RackSwitch G8264CS Application Manual

RIP Features

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G8264CS Application Guide for ENOS 8.4
ENOS provides the following features to support RIPv1 and RIPv2:
 Poison
Simple split horizon in RIP scheme omits routes learned from one neighbor in
updates sent to that neighbor. That is the most common configuration used in
RIP, that is setting this Poison to DISABLE. Split horizon with poisoned reverse
includes such routes in updates, but sets their metrics to 16. The disadvantage of
using this feature is the increase of size in the routing updates.
Triggered Updates

Triggered updates are an attempt to speed up convergence. When Triggered
Updates is enabled, whenever a router changes the metric for a route, it sends
update messages almost immediately, without waiting for the regular update
interval. It is recommended to enable Triggered Updates.
 Multicast
RIPv2 messages use IPv4 multicast address (224.0.0.9) for periodic broadcasts.
Multicast RIPv2 announcements are not processed by RIPv1 routers. IGMP is
not needed since these are inter‐router messages which are not forwarded.
To configure RIPv2 in RIPv1 compatibility mode, set multicast to disable, and
set version to both.
 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 an 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.