Allied Telesis AT-S25 - Manual (Page 267)

AT-S25 Management Software User’s Guide
267
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) 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 and times-out. The stack
forwards the leave request to the router and
simultaneously ceases transmission of any further
multicast packets out the port where the host node is
connected.
• (Multi-Hosts/Port (Intermediate) 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 of 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 Intermediate Multi-
Host Port selection.
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no longer active on the port.
PARAMATER DESCRIPTION