Allied Telesis AT-S60 - Manual (Page 551)

Chapter 37: IGMP Snooping
Section IV: Web Browser Management 550
Select the Single-Host/Port (Edge) setting when there is only one
host node connected to each port on the switch. This setting
causes the switch to immediately stop sending multicast packets
from a port under the following conditions:
❑ When a host node signals its desire to leave a multicast group by
sending a leave request
❑ When the host node stops sending reports and times-out
The switch forwards the leave request to the router and
simultaneously ceases transmission of multicast packets from the
port where the host node is connected.
Select the Multi-Hosts/Port (Intermediate) setting if there is more
than one host node connected to a port, such as when a port is
connected to an Ethernet hub to which multiple host nodes are
connected. With this setting selected, the switch continues
sending multicast packets from a port even after it receives a
leave request from a host node on the port. This ensures that the
remaining active host nodes on the port continue to receive the
multicast packets. Only after all of the host nodes connected to a
port have transmitted leave requests (or have timed out) does the
switch stop sending multicast packets from the port.
If a switch has a mixture of host nodes, that is, some connected
directly to the switch and others through an Ethernet hub, select
Multi-Hosts/Port (Intermediate).
Multicast Router Ports Mode
Controls whether the detection of ports on the switch that are
connected to multicast routers is made automatically or
manually.
You use this selection to specify which of the ports on the switch
are connected to multicast routers. You can allow the switch to
determine this automatically by selecting Auto-Detect, which is
the default setting. To specify the ports manually, click Manual
Select and type the port numbers in the box.
Host/Router Timeout Interval
Specifies the time period, in seconds, after which the switch
determines that a host node has become inactive. An inactive
host node is a node that has not sent an IGMP report during the
specified time interval. The range is from 1 second to 86,400
seconds (24 hours). The default is 260 seconds.
This parameter also specifies the time interval used by the switch
in determining whether a multicast router is still active. The switch
makes the determination by watching for queries from the router.