3Com 3CRWX120695A Reference Manual page 203

6 In the Other Querier Present Interval box, specify how long (1 to 65,535
seconds) the WX switch waits for a general query to arrive before making
itself the querier. The default interval is 255 seconds.
7 In the Query Response Interval box, specify how long (1 to 65,535 tenths
of a second) a device can take to respond to an IGMP query. The default
interval is 100 tenths of a second (10 seconds).
8 In the Last Member Query Interval box, specify how long (1 to 65,535
tenths of a second) the WX switch waits for a response to a group query,
after receiving a leave message for that group, before removing the
group. The default value is 10 tenths of a second (1 second).
9 In the Robustness Value box, specify the robustness value (2 to 255),
which sets IGMP timers to adjust to the amount of traffic loss on the
network. Set the robustness value higher to adjust for more traffic loss.
The default is 2.
10 To enable proxy reporting, which summarizes collected station IGMP
reports, select Proxy Report.
11 To enable multicast router solicitation, which allows the WX to discover
multicast routers on the subnet, select Multicast Router Solicitation.
12 In the Solicitation Interval box, specify the interval (1 to 65,535 seconds)
between multicast router solicitations by a WX. The default interval is
30 seconds.
13 Do one of the following:
To configure static multicast ports, click Next to display the Member
IGMP Setup page. (See "Configuring Static Multicast Ports".)
To close the wizard and save the changes, click Finish.
Configuring Static Multicast Ports
A WX learns about multicast routers and receivers from multicast traffic
received from those devices. When the WX receives traffic from a
multicast router or receiver, the WX adds the port that received the traffic
as a multicast router or receiver port. The WX forwards traffic to multicast
routers only on the multicast router ports and forwards traffic to multicast
receivers only on the multicast receiver ports.
The router and receiver ports that the WX learns based on multicast
traffic age out if they are unused. If necessary, you can statically configure
multicast router ports or multicast receiver ports on the WX.
Configuring VLANs 203