User Guide

Configuring the IGMP version for individual ports in a VLAN
You can specify the IGMP version for individual ports in a VLAN. For example, the following commands
configure ports 4, 5, and 6 to use IGMP V3. The other ports either use the IGMP version specified with
the multicast version command, or the globally-configured IGMP version.
device(config)#vlan 20
device(config-vlan-20)#multicast port-version 3 ethernet 2/4 to 2/6
Syntax: [no] multicast port-version [2 | 3 ] ethernetport [ethernet port | toport ]
To specify a list of ports, enter each port as ethernetport followed by a space. For example, ethernet
1/24 ethernet 6/24 ethernet 8/17.
To specify a range of ports, enter the first port in the range as ethernetport followed by the last port in
the range. For example, ethernet 1/1 to 1/8 .
You can combine lists and ranges in the same command. For example: enable ethernet 1/1 to 1/8
ethernet 1/24 ethernet 6/24 ethernet 8/17.
Configuring static groups to specific ports
A snooping-enabled VLAN cannot forward multicast traffic to ports that do not receive IGMP
membership reports. If clients cannot send reports, you can configure a static group which applies to
specific ports. The static group allows packets to be forwarded to the static group ports even though
they have no client membership reports.
device(config)#vlan 20
device(config-vlan-20)#multicast static-group 224.1.1.1 count 2 ethernet 0/1/3
ethernet 0/1/5 to 0/1/7
Information specific to FCX and ICX devices
The following information about the drop option is specific to FCX, ICX 6610, ICX 6430, ICX 6450, and
ICX 6650 devices.
The static group drop option discards data traffic to a group in hardware. The group can be any
multicast group including groups in the reserved range of 224.0.0.X. The drop option does not apply to
IGMP packets, which are always trapped to CPU when snooping is enabled. The drop option applies to
the entire VLAN, and cannot be configured for a port list. When the drop option is not specified, the
group must exist outside the reserved range.
device(config-vlan-20)#multicast static-group 239.1.1.1 count 3 drop
Syntax: [no] multicast static-group ipv4-address [count num] [port-numbers | drop]
The ipv4-address parameter is the address of the multicast group.
The count is optional, which allows a contiguous range of groups. Omitting the count num is equivalent
to the count being 1.
Configuring the IGMP version for individual ports in a VLAN
FastIron Ethernet Switch IP Multicast Configuration Guide 21
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