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Configuring H.323 Gatekeepers and Proxies
H.323 Gatekeeper Configuration Examples
VC-352
Cisco IOS Voice, Video, and Fax Configuration Guide
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
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
!
PX1
L0: 10.0.0.0
E0: 172.20.0.1
E0: 172.20.0.2
E1: 172.21.0.1
E1: 172.22.0.1
E2: 172.21.0.2
172.23.0.2
E0: 172.23.0.1
L0: 10.0.0.1
E1: 172.22.0.2
EP1
R1
11027
EP2
Data backbone
Multimedia
backbone
Edge net 1 Edge net 2
PX2
R2