User Manual

AT-S63 Management Software Web Browser User’s Guide
Section II: Advanced Operations 125
Multicast Host Topology
(continued)
The Single-Host/Port (Edge) setting is
appropriate when there is only one host
node connected to each port on the stack.
At this setting the stack immediately stops
sending multicast packets out a port when
a host node sends a leave request to
leave a multicast group 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.
The Multi-Host/Port (Intermediate) setting
is appropriate 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. At this setting 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 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 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 (Intermediate) selection.
Multicast Router Ports
Mode
Specifies whether the router ports are
determined automatically or if you enter
them manually. If you want the stack to
determine the ports automatically, select
Auto-Detect, which is the default. To enter
them yourself, click Manual Select and
enter the ports in the field. Port numbers
are entered in this format:
stack ID:port number
Table 19. IGMP Tab
Parameter Definition