Cisco Systems 78-11741-02 Enabling IP Bridging, Enabling Integrated Routing and Bridging, IPC-30

Configuring IP Addressing

Enabling IP Bridging

Command	Purpose
Router(config-if)# ip irdp preference number	Sets the IRDP preference level of the device.
Router(config-if)# ip irdp address address	Specifies an IRDP address and preference to proxy-advertise.
[number]

The Cisco IOS software can proxy-advertise other machines that use IRDP; however, this practice is not recommended because it is possible to advertise nonexistent machines or machines that are down.

Enabling IP Bridging

To transparently bridge IP on an interface, use the following commands beginning in global configuration mode:

	Command	Purpose
Step 1
	Router(config)# no ip routing	Disables IP routing.
Step 2
	Router(config)# interface type number	Specifies an interface and enters interface configuration mode.
Step 3
	Router(config-if)# bridge-groupgroup	Adds the interface to a bridge group.

Enabling Integrated Routing and Bridging

With integrated routing and bridging (IRB), you can route IP traffic between routed interfaces and bridge groups, or route IP traffic between bridge groups. Specifically, local or unroutable traffic is bridged among the bridged interfaces in the same bridge group, while routable traffic is routed to other routed interfaces or bridge groups. IRB can be used to switch packets in the following ways:

•From a bridged interface to a routed interface

•From a routed interface to a bridged interface

•Within the same bridge group

For more information about configuring integrated routing and bridging, refer to the “Configuring Transparent Bridging” chapter in the Cisco IOS Bridging and IBM Networking Configuration Guide.

Configuring a Routing Process

At this point in the configuration process, you can choose to configure one or more of the many routing protocols that are available, based on your individual network needs. Routing protocols provide topology information of an internetwork. Refer to subsequent chapters in this document for the tasks involved in configuring IP routing protocols such as BGP, On-Demand Routing (ODR), RIP, IGRP, OSPF, IP Enhanced IGRP, Integrated IS-IS, and IP multicast routing. If you want to continue to perform IP addressing tasks, continue reading the following sections.

Cisco IOS IP Configuration Guide

IPC-30