The following table lists the individual Brocade FastIron switches and the IPv6 Multicast Traffic
Reduction features they support. These features are supported in the Layer 2 and Layer 3 software
images.

Feature

ICX 6430

ICX 6450

FCX

ICX 6610

ICX 6650

FSX 800
FSX 1600

ICX 7750

MLD v1/v2 snooping (global and local)

08.0.01

08.0.10

MLD fast leave for v1

08.0.01

08.0.10

MLD tracking and fast leave for v2

08.0.01

08.0.10

Static MLD groups with support for proxy 08.0.01

08.0.01

08.0.10

MLD v1/v2 snooping per VLAN

08.0.01

08.0.10

PIM6-SM snooping

08.0.01

08.0.10

MLD snooping overview

The default method a device uses to process an IPv6 multicast packet is to broadcast it to all ports
except the incoming port of a VLAN. Packets are flooded by hardware without going to the CPU, which
may result in some clients receiving unwanted traffic.

If a VLAN is not Multicast Listening Discovery (MLD) snooping-enabled, it floods IPv6 multicast data
and control packets to the entire VLAN in hardware. When snooping is enabled, MLD packets are
trapped to the CPU. Data packets are mirrored to the CPU and flooded to the entire VLAN. The CPU
then installs hardware resources so subsequent data packets can be hardware-switched to desired

FastIron Ethernet Switch IP Multicast Configuration Guide

53-1003085-02