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Chapter 46 Multicast
XGS2220 Series User’s Guide
315
CHAPTER 46
Multicast
46.1 Multicast Overview
This chapter shows you how to configure various multicast features.
Traditionally, IP packets are transmitted in one of either two ways
– Unicast (one sender to one recipient)
or Broadcast (one sender to everybody on the network). Multicast delivers IP packets to just a group of
hosts on the network.
IGMP (Internet Group Management Protocol) is a network-layer protocol used to establish membership
in a multicast group
– it is not used to carry user data. Refer to RFC 1112, RFC 2236 and RFC 3376 for
information on IGMP versions 1, 2 and 3 respectively.
The Multicast Listener Discovery (MLD) protocol (defined in RFC 2710) is derived from IPv4's Internet
Group Management Protocol version 2 (IGMPv2). MLD uses ICMPv6 message types, rather than IGMP
message types. MLDv1 is similar to IGMPv2 and MLDv2 is similar to IGMPv3. MLD allows an IPv6 switch or
router to discover the presence of MLD listeners who wish to receive multicast packets and the IP
addresses of multicast groups the hosts want to join on its network.
MLD snooping and MLD proxy are analogous to IGMP snooping and IGMP proxy in IPv4. MLD filtering
controls which multicast groups a port can join.
• Use the IPv4 Multicast Status screen (Section 46.2 on page 319) to view IPv4 multicast group
information.
• Use the IGMP Snooping screen (Section 46.3 on page 320) to enable IGMP snooping to forward group
multicast traffic only to ports that are members of that group.
• Use the IGMP Snooping VLAN screen (Section 46.4 on page 324) to perform IGMP snooping on VLANs.
• Use the IGMP Filtering Profile (Section 46.5 on page 326) to specify a range of multicast groups that
clients connected to the Switch are able to join.
46.1.1 What You Can Do – IPv6 Multicast
• Use the IPv6 Multicast Status screen (Section 46.6 on page 328) to view IPv6 multicast group
information.
• Use the MLD Snooping-proxy screen (Section 46.7 on page 329) to enable the upstream port to report
group changes to a connected multicast router and forward MLD messages to other upstream ports.
• Use the MLD Snooping-proxy VLAN screen (Section 46.8 on page 329) to enable and configure MLD
snooping-proxy settings on the VLANs you specified.
• Use the MLD Snooping-proxy Port Role Setting screen (Section 46.9 on page 332) to assign MLD
snooping-proxy port roles and configure Leave settings for each port.
• Use the MLD Snooping-proxy Filtering screen (Section 46.10 on page 334) to enable and configure
MLD snooping-proxy filtering.
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