Allied Telesis AT-S25 - Manual (Page 170)

Section II: Local and Telnet Mangement
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Table 13 lists the parameters appeared in the IGMP Snooping
Configuration menu.
Table 13 IGMP Snooping Configuration Parameters
PARAMETER DESCRIPTION
1 - IGMP
Snooping
Status Enables and disables IGMP snooping on the stack. After
selecting this option, type E to enable or
D to disable
this feature.
2 - Multicast
Host Topology Defines whether there is only one host node per stack
port or multiple host nodes per port.
Possible settings for this parameter are:
• Single-Host/Port (Edge): This setting is appropriate
when there is only one host node connected to each
port on the stack. This setting causes the stack to
immediately stop sending multicast packets out a
stack port when a host node signals its desire to leave
a multicast group by sending a leave request or when
the host node stops sending reports. The stack
responds by immediately ceasing the transmission of
further multicast packets out the port where the host
node is connected.
• Multi-Host/Port (Intermediate): This setting is
appropriate if there is more than one host node
connected to a stack port, such as when a port is
connected to an Ethernet hub to which multiple host
nodes are connected. With this setting selected the
stack continues sending multicast packets out 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 will continue to receive the
multicast packets. Only after all the host nodes
connected to a stack port have transmitted leave
requests (or have timed out) will the stack stop
sending multicast packets out the port.
If a stack has a mixture of host nodes, that is, some
connected directly to the stack and others through
an Ethernet hub, you should select the Multi-Host Port
selection.