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To achieve the ideal multicast forwarding scenario, we need a
protocol based on a layer two, or ethernet addresses, and one that
is dynamic. And it should come as no surprise that this protocol is
the CGMP. One of the main concerns when CGMP was designed was that
no modifications should need to be made to existing multicast
protocols on either hosts or routers. Therefore, CGMP must add
additional functionality without altering the operation of IGMP or
any of the layer three multicast routing protocols. The relationship
between IGMP, CGMP, routers, and switches is shown in Figure
4-9. |
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