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IGMP snooping configuration 2
About IGMP snooping mcache entries and group addresses
An IGMP snooping group address entry is created when an IGMP join message is received for a
group. An IGMP snooping mcache entry is created when data traffic is received for that group. Each
mcache entry represents one data stream, and multiple mcache entries (up to 32) can share the
same hardware (MAC) address entry. The egress port list for the mcache entry is obtained from the
IGMP group address entry. If there is no existing IGMP group address entry when an mcache entry
is created, data traffic for that multicast group is dropped in hardware. If there is an existing IGMP
group address entry when an mcache is created, data traffic for that multicast group is switched in
hardware.
Changing the maximum number of supported IGMP snooping mcache entries
When IGMP snooping is enabled, FSX, ICX 6610, and ICX 6450 devices support up to 8192 IGMP
snooping multicast cache (mcache) entries. ICX 6430 devices support up to 2048 IGMP snooping
multicast cache (mcache) entries.
If necessary, you can change the maximum number of IGMP snooping cache entries supported on
the device. To do so, enter the system-max igmp-snoop-mcache command.
Brocade(config)#system-max igmp-snoop-mcache 2000
Syntax: [no] system-max igmp-snoop-mcache num
where num is a value ranges from 256 through 8192. The default is 512.
Setting the maximum number of IGMP group addresses
When IGMP snooping is enabled, FCX, FSX, ICX 6610, and ICX 6450 devices support up to 8192 of
IGMP group addresses, and the configurable range is from 256 through 8192. ICX 6430 devices
support up to 4096 IGMP group addresses.
The configured number is the upper limit of an expandable database. Client memberships
exceeding the group limit are not processed. Enter the system-max igmp-snoop-group-addr
command to define the maximum number of IGMP group addresses.
Brocade(config)#system-max igmp-snoop-group-addr 1600
Syntax: [no] system-max igmp-snoop-group-addr num
The num variable is a value ranging from 256 through 8192. The default for IGMP snooping group
addresses is 4096, with the exception of 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 number command enables IGMP V3.
Brocade(config)#ip multicast version 3
Syntax: [no] ip multicast version 2 | 3
If you do not specify a version number, IGMP V2 is assumed.
FastIron Ethernet Switch IP Multicast Configuration Guide 33
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