Fabric OS Reference Manual

Telnet Commands 125
mcastShow
Display multicast routing information.
Synopsis
mcastShow [group_ID]
Availability All users
Description Use this command to display the multicast routing information, as it is
known by the FSPF path selection and routing task, for all ports in the
switch. The multicast routing information indicates, for each multicast
group, all the ports that are members of that group; that is, ports that are
able to send and receive multicast frames on that group.
The multicast routing information is shown for all the multicast groups, or
for a specific group if a group ID is supplied.
Normally, an
F_Port
or
FL_Port
is a member of the multicast group only
if it has joined the group using the Alias Server protocol. On the other hand,
E_Ports
that are part of the multicast group are selected by the multicast
path selection protocol. They are chosen in a way that prevents multicast
routing loops.
The multicast paths are active for all the multicast groups at all times,
regardless of whether a multicast group contains any members.
The multicast routing information is shown as a set of bit maps. Each bit in
the bit map represents a port, with the least significant bit representing port
0. A bit set to 1 indicates that a port is part of the multicast distribution tree.
The following fields are displayed:
Group:
Multicast group ID.
Member Ports:
Bit map of all ports in the multicast tree for that
multicast group.
Member ISL Ports:
Bit map of all
E_Ports
in the multicast tree for
that multicast group.
Static ISL Ports:
Reserved. It should be all zeroes.