Allied Telesis AT-S25 - Manual (Page 170)

Section II: Local and Telnet Mangement
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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
(Intermediate) selection.
3 - Host/Router
Timeout
Interval Specifies the time period in seconds after which the
stack 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 stack in determining whether a multicast router is
still active. The stack makes the determination by
watching for queries from the router. If the stack does
not detect any queries from a multicast router during
the specified time interval, it assumes that the router is
no longer active on the port.
PARAMETER DESCRIPTION