Changing Vlan Igmp Settings - 3Com WX1200 Reference Manual

216 C 6: C
HAPTER ONFIGURING
Changing VLAN IGMP
Settings
WX S P
YSTEM ARAMETERS
2 To switch to an alternate port if the root port fails, select Enable Uplink
Fast.
3 To enable the backbone fast convergence feature, select Enable
Backbone Fast.
4 Click Save.
Internet Group Management Protocol (IGMP) snooping controls multicast
traffic on a WX by forwarding packets for a multicast group only on the
ports that are connected to members of the group. IGMP is especially
useful for WLANs because bandwidth is relatively constrained. The WX
listens for multicast packets and maintains a table of multicast groups, as
well as their sources and receivers, based on the traffic. IGMP snooping is
enabled by default.
You can configure IGMP snooping parameters and enable or disable the
feature on an individual VLAN basis.
The current software version supports IGMP versions 1 and 2.
To configure IGMP snooping:
1 Access the VLAN table:
a Select the Configuration tool bar option.
b In the Organizer panel, click the plus sign next to the WX switch.
c Click the plus sign next to System.
d Select VLANs.
2 In the Content panel, select the VLAN.
3 In the Task List panel, select Configure IGMP.
4 To enable IGMP snooping, select Enable. To disable IGMP snooping,
clear Enable. By default, IGMP snooping is enabled.
5 In the Version list, select Version 1 or Version 2 of IGMP.
6 If IGMP queriers are not on the subnet (for example, multicast routers),
select Querier Enabled.
3Com recommends that you use the pseudo-querier only when the VLAN
contains local multicast traffic that is not routed.
7 In the Query Interval box, specify the interval (1 to 65,535 seconds) at
which the WX switch sends general IGMP queries on behalf of multicast
routers to advertise multicast groups. The default interval is 125 seconds.