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660 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Configuring IGMP snooping
22
Configuring the IGMP version for the VLAN
You can specify the IGMP version for a VLAN. For example, the following commands configure VLAN
20 to use IGMPv3.
PowerConnect(config)# vlan 20
PowerConnect(config-vlan-20)# multicast version 3
Syntax: [no] multicast version 2 | 3
If no IGMP version is specified, then the globally-configured IGMP version is used. If an IGMP
version is specified for individual ports, those ports use that version, instead of the VLAN version.
Configuring the IGMP version for individual ports
You can specify the IGMP version for individual ports in a VLAN. For example, the following
commands configure ports 0/1/4, 0/1/5, 0/1/6 and 0/2/1 to use IGMPv3. The other ports either
use the IGMP version specified with the multicast version command, or the globally-configured
IGMP version.
PowerConnect(config)# vlan 20
PowerConnect(config-vlan-20)# multicast port-version 3 ethernet 0/2/1 ethernet
0/1/4 to 0/1/6
Syntax: [no] multicast port-version 2 | 3 <port-numbers>
Configuring static groups to the entire VLAN or 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 the entire VLAN or only to specific ports. The static group allows packets to be forwarded to the
static group ports even though they have no client membership reports. The static group to the
entire VLAN is used in VLAN flooding, which consumes less hardware resource than the static
group to ports.
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.
PowerConnect(config)# vlan 20
PowerConnect(config-vlan-20)# multicast static-group 224.1.1.1 count 2 ethernet
0/1/3 ethernet 0/1/5 to 0/1/7
PowerConnect(config-vlan-20)# multicast static-group 239.1.1.1 count 3 drop
PowerConnect(config-vlan-20)# multicast static-group 239.1.1.1
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.
If no <port-numbers> are entered, the static groups apply to the entire VLAN.