Allied Telesis AT-S25 - Manual (Page 49)

AT-S25 Version 1.4 User’s Guide
49
Enabling or Disabling IGMP Snooping
An AT-8300 stack supports the Internet Group Management Protocol
(IGMP) snooping feature. This feature allows the stack to take advantage
of performance improvements provided by IP multicasting. Allied
Telesyn’s implementation supports IGMP Version 1.
A stack uses IGMP snooping to obtain information about multicast
groups by looking at IGMP packets sent from hosts and routers, and also
by looking at Distance Vector Multicast Routing Protocol (DVMRP)
packets. IGMP packets provide information about nodes joining
multicast groups, while DVMRP packets provide information about
delivery paths. With this information, the stack builds membership
groups of ports for each IP multicast address.
To enable or disable IGMP snooping in a stack, perform the following
procedure:
1. From the Main Menu, select any switch in the stack.
Note
You do not need to select the master switch to enable or disable
IGMP snooping in a stack. A change to the IGMP setting applies to all
switches in a stack.
2. From the Main Menu, select System configuration.
The following options in the System Configuration menu are used
to enable or disable IGMP snooping.
Figure 14 IGMP Snooping Options
3. Toggle the options to enable or disable IGMP snooping.
4. Return to the Main Menu.