Configuration Guide User guide

1468 FastIron Configuration Guide
53-1002494-02
IGMP snooping configuration
VLAN-specific IGMP snooping tasks
Perform the following VLAN-specific tasks:
• “Configuring the IGMP mode for a VLAN” (active or passive)
• “Disabling IGMP snooping on a VLAN”
• “Configuring the IGMP version for a VLAN”
• “Configuring static router ports.”
• “Turning off static group proxy”
• “Enabling IGMP V3 membership tracking and fast leave for the VLAN”
• “Enabling fast leave for IGMP V2”
• “Enabling fast convergence”
Port-specific IGMP snooping tasks
Perform the following port-specific tasks:
• “Disabling transmission and receipt of IGMP packets on a port”
• “Configuring the IGMP version for individual ports in a VLAN”
Configuring the IGMP V3 snooping software resource limits
By default, FastIron X Series devices support up to 512 IGMP snooping multicast cache (mcache)
entries and a maximum of 8K IGMP group addresses. If necessary, you can change the default
values using the procedures in this section.
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, by default, the system supports up to 512 IGMP snooping
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.
BrocadeBrocade(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.