Setting the maximum number of IGMP group addresses
Setting the maximum number of IGMP group addresses
The configured number of IGMP group addresses is the upper limit of an expandable database. Client memberships exceeding the group limit are not processed. Configure the
Syntax: [no] system-max igmp-snoop-group-addr num
The num variable is a value from 256 to 8192. The default for IGMP snooping group addresses is 4096, except for ICX 6430 devices where the default is 1024.
Enabling IGMP snooping globally on the device
When you globally enable IGMP snooping, you can specify IGMP V2 or IGMP V3. The ip multicast version command enables IGMP V3.
device(config)#ip multicast version 3
Syntax: [no] ip multicast version [2 3]
If you do not specify a version number, IGMP V2 is assumed.
Configuration notes for Layer 3 devices
•If Layer 3 multicast routing is enabled on your system, do not attempt to enable Layer 2 IGMP snooping. Layer 2 IGMP snooping is automatically enabled with Layer 3 multicast routing.
•If the
•IGMP snooping is not supported on the default VLAN of Layer 3 Switches.
Configuring the IGMP mode
You can configure active or passive IGMP modes on the Brocade device. The default mode is passive. If you specify an IGMP mode for a VLAN, it overrides the global setting.
•Active - When active IGMP mode is enabled, a Brocade device actively sends out IGMP queries to identify multicast groups on the network, and makes entries in the IGMP table based on the group membership reports it receives.
NOTE
Routers in the network generally handle this operation. Use the active IGMP mode only when the device is in a
FastIron Ethernet Switch IP Multicast Configuration Guide | 19 |
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