Avaya P580 User Manual page 568

Multiservice switches

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The Dissemination

Process, LGMP

Automatic Client Port Pruning, if enabled, will remove a client port from a

session if no IGMP reports have been received on that port for that session

in the time specified.

* Note: By enabling Automatic Client Port Pruning, there is a chance

that the switch may disrupt multicast service temporarily to

clients requesting to receive that multicast traffic. This is

because of the report suppression mechanism in IGMP v1 and

Automatic Router Port pruning, if enabled, will prune quiet router ports. If

the switch has not been notified that there is a router on the port in Router

Pruning Time, then the router port is removed.

The Dissemination Process provides a method to dynamically configure

multicast sessions on switches with VLANs that do not have IP interfaces.

Figure 20-1. LGMP and CGMP Snooping

Switch 1 will route the multicast traffic from the Multicast Server on VLAN

1 to VLAN 2. Switch 2 does not have an IP interface on VLAN 2. Because

the Learning Process requires an IP interface to perform learning, a different

method must be used to create multicast sessions on Switch 2. Switch 1

must disseminate the Intelligent Multicast information to all switches on the

attached VLANs that do not have IP interfaces. Two protocols are available

for this use on the Switch, LGMP and CGMP.

LGMP and CGMP are similar protocols. Both protocols have a server

implementation that runs on a switch that implements the Learning Process,

and both protocols have a client implementation which runs on switches

that do not have local IP interfaces on all involved VLANs. For the Avaya

User Guide for the Avaya P580 and P882 Multiservice Switches, v6.0