Avaya C360 Layer 2 Features
140 Installation and Configuration Guide Avaya C360 Multilayer Stackable Switches, version 4.5
The C360 supports multicast filtering. The C360 learns which switch ports need to receive
which multicast packets and configures the necessary information into the switch's hardware
tables. This learning is based on IGMP (version 1 or 2) snooping.
The multicast filtering function in the C360 is transparent to the IP hosts and routers. It does not
affect the forwarding behavior apart from filtering multicast packets from certain ports where
they are not needed. To the ports that do get the multicast, forwarding is performed in the same
way as if there was no filtering, and the multicast packet will not be sent to any ports that would
not receive it if there was no filtering.
The multicast filtering function operates per VLAN. A multicast packet arriving at the device on a
certain VLAN will be forwarded only to a subset of the ports of that VLAN. If VLAN tagging mode
is used on the output port, then the multicast packet will be tagged with the same VLAN number
with which it arrived. This is interoperable with multicast routers that expect Layer 2 switching to
be done independently for each VLAN.
Figure 28: IP Multicast Filtering in Action
IP Multicast Filtering configuration is associated with the setting up of three timers:
●The Router Port Pruning timer ages out Router port information if IGMP queries are not
received within the configured time.
●The Client Port Pruning time is the time after the C360 switch reset that the filtering
information is learned by the switch but not configured on the ports.
Figure notes:
1. Network with no IP Multicast Filtering
- PC generates traffic for multicast group A
- All other PCs receive the traffic whether or nor they require it.
2. Network with IP Multicast Filtering
- Only PCs that have registered with group A receive the traffic
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