Rip Distribution Access Lists - Avaya G450 Manual

Configuring the router
The split-horizon technique prevents information about routes from exiting the router interface
through which the information was received. This prevents small routing loops. 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 explicitly indicate that a network or subnet is unreachable.
Poison-reverse updates are sent to defeat large routing loops. 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.
Up to 99 RIP distribution access lists can be configured on the Avaya G450 Media Gateway.
For example, to configure RIP distribution access list number 10 permitting distribution and
learning of network 10.10.0.0, do the following:
1. Enter the command: ip distribution access-list 10 1 permit 10.10.0.0
0.0.255.255
The default action of the access list is deny and can be changed using the
ip distribution access-default-action command.
Note:
Whenever at least one permit rule exists, distributing and learning of all the
Note:
remaining networks is denied, unless specifically permitted by another rule.
2. Apply the distribution access list created in Step 1 by performing the following procedure
within the Router RIP context:
- Enter the distribution-list 10 in command to apply list number 10 created in
Step 1 on all updates received on all interfaces.
- Enter the distribution-list 10 in FastEthernet 10/2 command to apply
Access List 10 on updates received on interface 'FastEthernet 10/2'.
- Enter the distribution-list 10 out command to apply Access List 10 to all
advertised updates.
- Enter the distribution-list 10 out ospf command to apply Access List 10 to
all advertised updates that were learned from OSPF (redistributed from OSPF into
RIP).
488 Administration for the Avaya G450 Media Gateway