Chapter 25 Multicast
MGS3520 Series User’s Guide
204
The following table describes the labels in this screen.
Table 84
Advanced Application > Multicast > IPv4 Multicast > IGMP Snooping
LABEL
DESCRIPTION
IGMP Snooping
Use these settings to configure IGMP Snooping.
Mode
The Switch supports IGMP version 1, IGMP version 2 and IGMP version 3.
Select the version of the IGMP packets that the Switch should use (
Version2
or
Version3
)
to enable IGMP Snooping to forward group multicast traffic only to ports that
are members of that group. Otherwise, select
Disable
.
Querier
Select this option to allow the Switch to send IGMP General Query messages to the VLANs
with the multicast hosts attached.
Host Timeout
Specify the time (from 1 to 16 711 450) 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.
Note: 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.
Unknown
Multicast Frame
Specify the action to perform when the Switch receives an unknown multicast frame.
Select
Drop
to discard the frame(s). Select
Flooding
to send the frame(s) to all ports.
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 frame(s). Select
Flooding
to send the frame(s) to all
ports.
Port
This field displays the port number.
*
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.
Note: 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.
