Quick Reference Guide

788 PowerConnect B-Series TI24X Configuration Guide

53-1002269-02

Filtering

Redistributing IBGP routes into RIP and OSPF

By default, the Layer 3 Switch does not redistribute IBGP routes from BGP4 into RIP or OSPF. This

behavior helps eliminate routing loops. However, if your network can benefit from redistributing the

IBGP routes from BGP4 into OSPF or RIP, you can enable the Layer 3 Switch to redistribute the

routes. To do so, use the following CLI method.

To enable the Layer 3 Switch to redistribute BGP4 routes into OSPF and RIP, enter the following

command.

PowerConnect(config-bgp-router)# bgp-redistribute-internal

Syntax: [no] bgp-redistribute-internal

To disable redistribution of IBGP routes into RIP and OSPF, enter the following command.

PowerConnect(config-bgp-router)# no bgp-redistribute-internal

Filtering

This section describes the following:

• “Filtering specific IP addresses” on page 788

• “Filtering AS-paths” on page 790

• “Filtering communities” on page 793

• “Defining IP prefix lists” on page 795

• “Defining neighbor distribute lists” on page 796

• “Defining route maps” on page 797

• “Using a table map to set the rag value” on page 805

• “Configuring cooperative BGP4 route filtering” on page 806

Filtering specific IP addresses

You can configure the router to explicitly permit or deny specific IP addresses received in updates

from BGP4 neighbors by defining IP address filters. The router permits all IP addresses by default.

You can define up to 100 IP address filters for BGP4.

• If you want permit to remain the default behavior, define individual filters to deny specific IP

addresses.

• If you want to change the default behavior to deny, define individual filters to permit specific IP

addresses.

NOTE

Once you define a filter, the default action for addresses that do not match a filter is “deny”. To

change the default action to “permit”, configure the last filter as “permit any any”.

Address filters can be referred to by a BGP neighbor's distribute list number as well as by match

statements in a route map.