Configuration Guide User guide

1616 FastIron Configuration Guide
53-1002494-02
MLD snooping configuration
• Modifying the leave wait time
• Modifying the mcache age interval
• Disabling error and warning messages
MLD snooping VLAN-specific tasks:
• Configuring the MLD mode for the VLAN: active or passive
• Enabling or disabling MLD snooping for the VLAN
• Configuring the MLD version for the VLAN
• Configuring the MLD version for individual ports
• Configuring static groups to the entire VLAN or some ports
• Configuring static router ports
• Disabling proxy activity for a static group
• Enabling client tracking and the fast leave feature for MLDv2
• Configuring fast leave for MLDv1
• Configuring fast-convergence
Configuring the hardware and software resource limits
The system supports up to 8K of hardware-switched multicast streams. The default is 512. To
define the maximum number of MLD snooping mcache entries, enter the system-max
mld-snoop-mcache <num> command.
Brocade(config)#system-max mld-snoop-mcache 8000
Syntax: [no] system-max mld-snoop-mcache <num>
<num> is a value from 256 – 8192. The default is 512.
The system supports up to 32K of multicast groups. The default is 8192. The configured number
is the upper limit of an expandable database. Client memberships exceeding the group limits are
not processed. To define the maximum number of multicast group addresses supported, enter the
system-max mld-max-group-addr <num> command.
Brocade(config)#system-max mld-max-group-addr 4000
Syntax: [no] system-max mld-snoop-mcache <num>
<num> is a value from 256 – 32768. The default is 8192.
Disabling transmission and receipt of MLD packets
on a port
When a VLAN is snooping-enabled, all MLD packets are trapped to the CPU without hardware VLAN
flooding. The CPU can block MLD packets to and from a multicast-disabled port, and will not add
that port to the output interfaces of hardware resources, which prevents the disabled port from
receiving multicast traffic. However, if static groups to the entire VLAN are defined, the traffic for
these groups is flooded to the entire VLAN, including to the disabled ports. Since the hardware
cannot block traffic from disabled ports, hardware traffic is switched in the same way as traffic
from enabled ports.