TMS zl Management and Configuration Guide ST.1.1.100226

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Routing
Multicast
2. Select Multicast from the Show routes list.
Figure 9-27. Network > Routing > View Routes Window (Multicast Routes)
As you can see, multicast routes are different from unicast routes. Traffic
destined to a multicast address is usually destined to many different devices.
Therefore the TMS zl Module may need to copy a multicast packet and forward
it on several interfaces. Therefore, instead of a gateway address, the route lists
interfaces.
In addition, multicast traffic often runs unidirectionally from a source to
receivers rather than bi-directionally as does unicast traffic. Multicast routes
can therefore be source-specific, and the source is indicated in the route.
The window displays all of the multicast routes that the module knows. The
columns in the table are as follows:
■ Group Address—IP address of the multicast group
■ Source Address —IP address of the endpoint that sends the multicast
■ Neighbor — IP address of the next-hop, upstream router in the multicast
group
■ Interface — Interfaces (TMS VLANs or GRE tunnels) that belong to the
multicast group and on which the module will forward multicasts