User Manual

Moxa’s Managed Switch Next Generation OS (v3.x) User Manual
90
With IGMP Snooping
Differences Between IGMP Snooping V1, V2, and V3
IGMP protocols regulate the communication mechanism between querier and listener. IGMP Snooping has
three different versions. Refer to the following table for the detailed differences.
IGMP Version
Main Features
Reference
V1
The IGMPv1 querier will periodically send out a "query". Listeners can
solicit a "report" of their interested
group. However, IGMPv1 does not
have a "leave group" message, and the querier might need to
implement a timeout mechanism for each registered group.
RFC-1112
V2
Compatible with V1 and the following functions:
a. Group-specific query
b. Leave group messages
c. Resends specific queries to verify leave message was the last one
in the group
d. Querier election if multiple capable queries are present.
RFC-2236
V3
Compatible with V1, V2, and the following functions:
Source filtering enables hosts to specify:
- the multicast traffic from a specified source
- the multicast traffic from any source except a specified source
RFC-3376
IGMP Snooping Settings
First, select IGMP Snooping on the menu and then click the General tab on the configuration page.
Enable
Setting
Description
Factory Default
Enabled
Enable IGMP Snooping on a specific VLAN.
Disabled
Disabled
Disable IGMP Snooping on a specific VLAN.