Mcastshow - HP StorageWorks MSA 2/8 - SAN Switch Reference Manual

Fabric OS Commands

mcastShow

Displays multicast routing information.
Synopsis
mcastShow [group_ID]
Availability
All users.
Release
V3.1.x
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.
422 Fabric OS Version 3.1.x/4.1.x Reference Guide