Page 504 7750 SR OS Services Guide
Multicast Listener Discovery (MLD) Snooping and MAC-Based Multicast
Forwarding
VPLS-based transport is a popular architecture as it better handles IPv6 multicast on the transport
configurations for those backbones who use IPv6 instead of IPv4.
The VPLS based transport architecture combines MLD snooping and MAC based multicast
forwarding.
MLD Snooping
MLD snooping is basically a IPv6 version of IGMP snooping. The guidelines and procedures are
similar to IGMP snooping as well.
MAC-Based IPv6 Multicast Forwarding
IPv6 multicast address to MAC address mapping — Ethernet MAC addresses in the range of 33-
33-00-00-00-00 to 33-33-FF-FF-FF-FF are reserved for IPv6 multicast. To map an IPv6 multicast
address to a MAC-layer multicast address, the low order 32 bits of the IPv6 multicast address are
mapped directly to the low order 32 bits in the MAC-layer multicast address.
IPv6 multicast forwarding entries — IPv6 multicast snooping forwarding entries are based on
MAC addresses, while native IPv6 multicast forwarding entries are based on IPv6 addresses
(supported on 7750 SR with IOM2). Thus, when both MLD snooping and native IPv6 multicast
are enabled on the same device, both formats are supported on the same IOM2, although they are
used for different services.
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