Avaya G430 Manual page 464

The router
Prevention of routing loops in RIP
You can use the following features in RIP to help avoid routing loops:
• Split-horizon: The split-horizon technique prevents information about routes from exiting
the router interface through which the information was received. This prevents small
routing loops.
• Poison-reverse: Poison-reverse updates explicitly indicate that a network or subnet is
unreachable. Poison-reverse updates are sent to defeat large routing loops.
For information on the CLI commands, see
page 464
Commands used to prevent routing loops in RIP
Split-horizon technique
• Enter ip rip split-horizon to enable the split-horizon mechanism.
• Use the no form of this command to disable the split-horizon mechanism. By default, split-
horizon is enabled.
Poison-reverse updates
• Enter ip rip poison-reverse to enable split-horizon with poison-reverse on an
interface.
• Use the no form of this command to disable the poison-reverse mechanism.
RIP distribution access lists
RIP distribution access lists consist of rules that specify how a router distributes and accepts
RIP routing information from other routers. Before sending an update, the router consults an
access list to determine if it should include specific routes in the update. When receiving an
update, the router first checks a set of rules which apply to incoming updates to determine if
it should insert those routes into its routing table. You can assign the rules per interface and
per direction.
You can configure up to 99 RIP distribution access lists on the Branch Gateway.
464 Administering Avaya G430 Branch Gateway
Commands used to prevent routing loops in RIP
Comments? infodev@avaya.com
on
October 2013