Avaya P580 - Manual (Page 546)

16-4 Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1
Chapter
Automatic Session Pruning, if enabled, will remove a session if that
session has not been active for Session Pruning Time.
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 v2.
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, LGMP
and CGMP
Snooping
The Dissemination Process provides a method to dynamically
configure multicast sessions on switches with VLANs that do not
have IP interfaces. See Figure 16-1
Figure 6-144. 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.