Brocade BigIron RX Series Configuration Guide - Manual (Page 1233)

BigIron RX Series Configuration Guide 1155
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Enabling IP multicast traffic reduction
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Filtering multicast groups
By default, the BigIron RX forwards multicast traffic for all valid multicast groups. You can configure
a device to filter out all multicast traffic for groups other than the ones for which the device has
received Group Membership reports.
When the device starts up, it forwards all multicast groups even though multicast traffic filters are
configured. This process continues until the device receives a group membership report. Once the
group membership report is received, the device drops all multicast packets for groups other than
the ones for which the device has received the group membership report.
To enable IP multicast filtering, enter the following command.
BigIron RX(config)# ip multicast filter
Syntax: [no] ip multicast filter
Configuring IGMP snooping tracking per VLAN instance
When IGMP Snooping Tracking is enabled, the BigIron RX immediately removes any IGMP host port
from the IP multicast group entry when it detects an IGMP-leave message on the specified host
port without first sending out group-specific queries to the interface. By default, IGMP Snooping
Tracking is disabled.
The ip multicast tracking command may be enabled globally as well as per VLAN basis. To enable
IGMP Snooping Tracking globally, enter a command such as the following.
BigIron RX(config)# ip multicast tracking
Syntax: [no] ip multicast tracking
The no form of this command disables the tracking process globally.
To enable IGMP Snooping Tracking per VLAN, enter commands such as the following.
BigIron RX(config)# vlan 100
BigIron RX(config-vlan-100)# ip multicast tracking
Syntax: [no] ip multicast tracking
The no form of this command disables the tracking process per VLAN.
For IGMPv3, the above command also internally tracks all the IGMPv3 hosts behind a given port.
The port is not removed from the IP multicast group entry in the forwarding table until all the hosts
behind that port have left that multicast group. When the last IGMPv3 host sends a IGMPv3 leave
message, the port is removed from the IP multicast group entry in the forwarding table immediately
without first sending out group_source_specific query to the interface
Syntax: [no] ip multicast tracking
Static IGMP membership
When configuring a static IGMP membership, you have two options.
The multicast static-group uplink command which sends the traffic to the router, and saves a port.
The multicast static-group <group-address> <port-list> command is for downstream traffic and
uses a port.