Cisco Systems VC-289 manual PX1 Configuration, VC-352

Configuring H.323 Gatekeepers and Proxies

H.323 Gatekeeper Configuration Examples

Assuming these requirements are met, configure the network illustrated in Figure 62 as follows:

•Configure each of the four networks as a separate routing autonomous system and do not redistribute routes between the multimedia backbone and any other autonomous system.

•Create a loopback interface on the proxy and configure it to be the proxy interface. That way no subnets of the multimedia backbone will be exposed to the edge network, or the other way around.

•To ensure that the address of the loopback interface does not travel outside the edge network, configure the appropriate distribution list on the edge router that connects the edge network to the data backbone. Configuring the appropriate distribution list guarantees that any ongoing H.323 call will be interrupted if the multimedia backbone fails. Otherwise, H.323 packets that originate from one proxy and that are destined to another proxy might discover an alternate route using the edge networks and the data backbone.

In some topologies, the two edge networks and the data backbone may be configured as a single autonomous system, but it is preferable to separate them as previously described because they are different networks with different characteristics.

The following examples illustrate the router configuration that is relevant to the closed proxy operation.

Configuring a Co-Edge Proxy with ASR Without Subnetting Example

See Figure 63 and the following configuration examples to see how to configure RIP on the two edge networks and how to configure IGRP on the two backbone networks.

Figure 63	Sample Configuration Without Subnetting
	E1: 172.22.0.1		E1: 172.22.0.2
	L0: 10.0.0.0		L0: 10.0.0.1
	PX1	Multimedia	E0: 172.23.0.1
		backbone
E0: 172.20.0.1
			PX2
EP1	Edge net 1		Edge net 2
			R2
E0: 172.20.0.2		Data backbone	172.23.0.2
	R1
			E2: 172.21.0.2
	E1: 172.21.0.1

EP2

11027

PX1 Configuration

The following output is for the PX1 configuration:

!

proxy h323

!

interface Loopback0

ip address 10.0.0.0 255.0.0.0

!Assume PX1 is in Zone 1, and the gatekeeper resides in the same routers as PX1: h323 interface

h323 h323-id PX1@zone1.com

h323 gatekeeper ipaddr 10.0.0.0

!

Cisco IOS Voice, Video, and Fax Configuration Guide

VC-352