Mcastshow - HP StorageWorks 8B - FC Entry Switch Reference Manual

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Telnet Commands

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
Member Ports
Member ISL Ports
Static ISL Ports
Operands This command has the following operand:
group_ID
Examples
To display multicast routing information:
See Also
bcastShow
portRouteShow
1-124
Multicast group ID.
Bit map of all ports in the multicast tree for that multicast group.
Bit map of all E_Ports in the multicast tree for that multicast group.
Reserved. It should be all zeroes.
Specify the multicast group to be displayed. This operand is optional.
switch:admin> mcastShow 9
Group Member Ports
----------------------------------------------------------------
9 0x00002083
Member ISL Ports Static ISL Ports
0x00002080 0x00000000
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