Dell PowerConnect B-RX Configuration Manual page 722

23
Configuring IP multicast traffic reduction
NOTE
When one or more BigIron RX devices are running Layer 2 IP Multicast Traffic reduction, configure
one of the devices for active IGMP and leave the other devices configured for passive IGMP. However,
if the IP multicast domain contains a multicast-capable, configure all the BigIron RX devices for
passive IGMP and allow the to actively send the IGMP queries.
NOTE
A router-id is required if a virtual interface (ve) or IP is not configured for IGMP snooping to work.
To enable IP Multicast Traffic Reduction, enter the following command.
BigIron RX(config)# ip multicast active
Syntax: [no] ip multicast active | passive
When you enable IP multicast on a BigIron RX, all ports on the device are configured for IGMP.
If you are using active IGMP, all ports can send IGMP queries and receive IGMP reports. If you are
using passive IGMP, all ports can receive IGMP queries.
IP Multicast Traffic Reduction cannot be disabled on individual ports of a BigIron RX. IP Multicast
Traffic Reduction must can be disabled globally by entering the no ip multicast command.
NOTE
If the "route-only" feature is enabled on the BigIron RX, then IP Multicast Traffic Reduction will not
be supported.
To verify that IP Multicast Traffic Reduction is enabled, enter the following command at any level of
the CLI.
BigIron RX(config)# show ip multicast
IP multicast is enabled - Active
Syntax: show ip multicast
Configuring the IGMP mode per VLAN
NOTE
A router-id is required if a virtual interface (ve) or IP is not configured for IGMP snooping to work.
If the IP Multicast command is not applied globally as described in
reduction"
In the following example, multicast traffic reduction is applied using IGMP snooping to VLAN 2.
(config)# vlan 2
(config-vlan-2)# multicast passive
Syntax: [no] multicast active | passive
When you enable IP multicast for a specific VLAN instance, IGMP snooping is enabled. The device
uses IGMP to maintain a table of the Group Membership reports received by the device for the
specified VLAN instance. You can use active or passive IGMP mode. There is no default mode.
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on page 649, you can apply it to individual VLANs instances within their configurations.
Active – When active IGMP mode is enabled, the switch actively sends out IGMP queries to
identify IP multicast groups within the VLAN instance and makes entries in the IGMP table
based on the Group Membership reports received from the network.
"Enabling IP multicast traffic
BigIron RX Series Configuration Guide
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