Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 645)

IGMP snooping: IP multicast metrics (Continued) TABLE 97
Metric Limit Comments
IGMP interfaces supported 32
IGMP snooping interfaces supported 256
Learning rate for PIM-SM 32 flows/second
Learning rate for IGMP snooping 512 groups/
second
Configuring IGMP snooping
By default, IGMP snooping is globally disabled on all VLAN interfaces. Refer to the Network OS
Command Reference for complete information about the commands in this section.
Enabling IGMP snooping
Use the following procedure to enable IGMP snooping on a Data Center Bridging (DCB)/Fibre Channel
over Ethernet (FCoE) switch.
1. Enter the configure terminal command to access global configuration mode.
2. Enter the ip igmp snooping enable command to enable IGMP for all interfaces.
This command ensures that IGMP snooping is active on all interfaces.
switch(config)# ip igmp snooping enable
3. Enter the interface command to select the VLAN interface number.
switch(config)# interface vlan 10
4. Optional: Activate the default IGMP querier functionality for the VLAN.
switch(config-vlan-10)# ip igmp snooping querier enable
5. Optional: Activate the IGMP querier functionality with additional features.
NOTE
The IGMP snooping configuration must be the same for all switches in the same VCS Fabric cluster.
For example, if you configure ip igmp snooping enable on VLAN 2 on a VDX switch, you must
configure that same command on VLAN 2 on all VDX switches in the cluster.
Configuring IGMP snooping querier
If your multicast traffic is not routed because Protocol-Independent Multicast (PIM) and IGMP are not
configured, use the IGMP snooping querier in a VLAN.
IGMP snooping querier sends out IGMP queries to trigger IGMP responses from switches that are to
receive IP multicast traffic. IGMP snooping listens for these responses to map the appropriate
forwarding addresses.
Configuring IGMP snooping
Network OS Administrator’s Guide 645
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