Chapter 25 Multicast
XGS4600 Series User’s Guide
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Host Timeout Specify the time (from 1 to 16711450) in seconds that elapses before the Switch removes an
IGMP group membership entry if it does not receive report messages from the port.
802.1p Priority Select a priority level (0 – 7) to which the Switch changes the priority in outgoing IGMP control
packets. Otherwise, select No-Change to not replace the priority.
IGMP Filtering Select Active to enable IGMP filtering to control which IGMP groups a subscriber on a port
can join.
If you enable IGMP filtering, you must create and assign IGMP filtering profiles for the ports that
you want to allow to join multicast groups.
IGMP Snooping
Smart Forward
Select Active to enable sending of multicast frame to querier port and IGMP subscriber
groups. Otherwise, the querier port forwards the frames only when it receives a join report and
it belongs to the IGMP group.
Unknown Multicast
Frame
Specify the action to perform when the Switch receives an unknown multicast frame. Select
Drop to discard the frames. Select Flooding to send the frames to all ports.
Unknown Multicast
Frame to Querier
Port
Specify the action to perform when Unknown Multicast Frame is set to Drop.
•Select Drop to discard the frames.
•Select Forwarding to send the frames to all querier ports.
•Select Forwarding on VLAN and enter the VLAN ID numbers to send the frames to the ports
which are used as an IGMP query port on the specified VLANs. Use a dash to specify
consecutive VLANs and a comma (no spaces) to specify non-consecutive VLANs. For
example, 51–53 includes 51, 52 and 53, but 51,53 does not include 52.
Reserved Multicast
Group
The IP address range of 224.0.0.0 to 224.0.0.255 are reserved for multicasting on the local
network only. For example, 224.0.0.1 is for all hosts on a local network segment and 224.0.0.9 is
used to send RIP routing information to all RIP v2 routers on the same network segment. A
multicast router will not forward a packet with the destination IP address within this range to
other networks. See the IANA web site for more information.
The layer-2 multicast MAC addresses used by Cisco layer-2 protocols, 01:00:0C:CC:CC:CC
and 01:00:0C:CC:CC:CD, are also included in this group.
Specify the action to perform when the Switch receives a frame with a reserved multicast
address.
•Select Drop to discard the frames.
•Select Flooding to send the frames to all ports.
SLOT This field appears only in stacking mode. Click the drop-down list to choose the slot number of
the Switch in a stack.
Port This field displays the port number. In stacking mode, the first number represents the slot ID and
the second is the port number. Please note that the default stacking ports (the last two ports
of your Switch) cannot be configured. They are reserved for stacking only.
* Settings in this row apply to all ports.
Use this row only if you want to make some settings the same for all ports. Use this row first to set
the common settings and then make adjustments on a port-by-port basis.
Changes in this row are copied to all the ports as soon as you make them.
Immed. Leave Select this option to set the Switch to remove this port from the multicast tree when an IGMP
version 2 leave message is received on this port.
Select this option if there is only one host connected to this port.
Table 102 Advanced Application > Multicast > IPv4 Multicast > IGMP Snooping (continued)
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