CHAPTER 15: IGMP IGMP
MULTILINK ML3000 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL 15–5
15.1.5 IGMP Support
The MultiLink family of switches support IGMP version 1 and version 2. The switch can act
either as a querier or a nonquerier. The querier router periodically sends general query
messages to solicit group membership information. Hosts on the network that are
members of a multicast group send report messages. When a host leaves a group, it sends
a leave group message. The difference between Version 1 and Version 2 is that version 1
does not have a “Leave” mechanism for the host. The MultiLink family of switches do
pruning when there is a leave message or a time expires on a port, we prune the multicast
group membership on that port.
1. The MultiLink switch supports only the default VLAN. It can be enabled within a
port VLAN, tagged VLAN, or no VLAN. It can snoop up to 256 multi-cast
Groups.
2. IGMP is disabled as a default. It has to be enabled to leverage the benefits of
IGMP.
3. The MultiLink switch supports only the default VLAN. It can be enabled within a
port VLAN, tagged VLAN, or no VLAN. It can snoop up to 256 multi-cast
Groups.
4. IGMP works only on default VLAN (DEFAULT_VLAN or VID = 1).
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