Cisco Systems VC-289 manual Isolating the Multimedia Network, page, VC-350

Configuring H.323 Gatekeepers and Proxies

H.323 Gatekeeper Configuration Examples

Note The no shut command is issued on both gatekeepers, primary and secondary. If the show gatekeeper status command is issued on the two gatekeepers, gk1 will show the following:

Gatekeeper State: UP

But gk2 will show the following:

Gatekeeper State: HSRP STANDBY

Using ASR for a Separate Multimedia Backbone Example

The examples in this section illustrate a separate multimedia backbone network dedicated to transporting only H.323 traffic. The closed functionality of the H.323 proxy is necessary for creating this type of backbone. Place a closed H.323 proxy on each edge of the multimedia backbone to achieve the following goals:

•The proxy directs all inter-proxy H.323 traffic, including Q.931 signaling, H.245, and media stream, to the multimedia backbone.

•The proxy shields the multimedia backbone so that routers on edge networks and other backbone networks are not aware of its existence. In this way, only H.323-compliant packets can access or traverse the multimedia backbone.

•The proxy drops any unintended non-H.323 packets that attempt to access the multimedia backbone. This section contains the following subsections:

•Enabling the Proxy to Forward H.323 Packets, page 351

•Isolating the Multimedia Network, page 351

•Configuring a Co-Edge Proxy with ASR Without Subnetting Example, page 352

•Co-Edge Proxy with Subnetting Example, page 354

•Configuring an Inside-Edge Proxy with ASR Without Subnetting Example, page 356

•Configuring a QoS-Enforced Open Proxy Using RSVP Example, page 357

•Configuring a Closed Co-Edge Proxy with ASR Without Subnetting Example, page 359

Figure 62 illustrates a network that has a multimedia backbone. A gatekeeper (not shown) in the edge network (zone) directs all out-of-zone H.323 calls to the closed proxy on the edge of that network. The closed proxy forwards this traffic to the remote zone through the multimedia backbone. A closed proxy and the edge router may reside in the same Cisco router, or they may be in separate routers, as shown in Figure 62.

Figure 62 Sample Network with Multimedia Backbone

PX1

EP1 Edge net 1

R1

Multimedia

backbone

Data backbone

PX2

Edge net 2 EP2

R2

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Cisco IOS Voice, Video, and Fax Configuration Guide

VC-350