Quick Reference Guide

446 PowerConnect B-Series TI24X Configuration Guide
53-1002269-02
Configuring IGMP snooping
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VLAN-specific 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”
• “IGMP V3 membership tracking and fast leave”
• “Fast leave for IGMP V2”
• “Fast convergence”
Port-specific 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, PowerConnect B-Series TI24X devices by default support up to 512 IGMP snooping
multicast cache (mcache) entries and a maximum of 1K 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. The egress port list for the mcache entry is
obtained from the IGMP group address entry. 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 a command such as the following.
PowerConnect(config)# system-max igmp-snoop-mcache 2000
Syntax: [no] system-max igmp-snoop-mcache <num>
where <num> is a value between 512 and 2048 on PowerConnect B-Series TI24X devices. The
default value is 512.