Alcatel Carrier Internetworking Solutions Switch/Router Multicast Claiming, Disabling Flood Limits

Multicast Claiming
Page 9-32
Multicast Claiming
Multicast claiming can be enabled for networks with heavy multicast traffic. When enabled,
multicast claiming frees the MPX from processing multicast packets by off-loading this traffic
to the switching modules. When multicast claiming is enabled, the switch “claims” destination
multicast addresses and places them in the CAMs of all switching modules in the switch.
You can enable multicast claiming by adding the following line to the mpx.cmd file:
bslLearnMcPkt=1
You can use the edit command to make this change. (See Chapter 7, “Managing Files,” for
instructions on using the edit command.) You will need to reboot the switch for this parame-
ter to take effect. Multicast claiming can later be disabled by changing the setting for this
parameter to zero (0), as follows:
bslLearnMcPkt=0
An alternative method for managing multicast traffic is through the use of Multicast VLANs. See
Chapter 27, “Managing AutoTracker” and Chapter 28, “Managing Multicast VLANs” for further
information.
Disabling Flood Limits
Two UI commands are available for controlling flood limits for individual ports and Groups.
The modvp command (described in Chapter 24, “Managing Groups and Ports”) allows you to
control the flood limits for a specific port. The flc command (described in Chapter 22,
“Configuring Bridging Parameters”) allows you to configure flood limits for all ports in a
group.
You can also disable flood limits on a switch-wide basis by adding the following line to the
mpx.cmd file:
disableFloodLimiting=1
You can use the edit command to make this change. See Chapter 11, “Managing Files,” for
instructions on using the edit command. You will need to reboot the switch for this parame-
ter to take effect.