ZyXEL Communications IES4005M User Manual page 134

Chapter 16 Multicast
• IGMP Snooping and Proxy Note - The IES acts as an IGMPv3 client host for an edge IGMPv3
multicast router and as a IGMPv2/v3 router for IGMPv2/v3 client hosts (subscribers). The IES
can recognize IGMPv3 protocol messages and forward them towards the IGMP multicast router. It
does not support full-featured IGMPv3 functions like source IP address control specified in RFC
3376.
• Multicast VLAN - This allows one single multicast VLAN to be shared among different subscriber
VLANs on the network. This improves bandwidth utilization by reducing multicast traffic in the
subscriber VLANs and simplifies multicast group management.
• IGMP group limit - This feature limits the number of multicast groups a port is allowed to join.
• IGMP fast leave - The IES removes a port from the multicast table immediately when an IGMP
leave report is received on the port.
• The IES does not respond to IGMP join and leave messages on the upstream interface. The
system only responds to IGMP query messages on the upstream interface on the Multicast VLAN.
• The IES only sends IGMP query messages to the hosts that are members of the Multicast VLAN.
Multicast Listener Discovery
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 equivalent to IGMPv2 and MLDv2 is equivalent to IGMPv3.
MLD allows an IPv6 switch or router to discover the presence of MLD hosts 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.
An MLD Report message is equivalent to an IGMP Report message, and a MLD Done message is
equivalent to an IGMP Leave message.
The following table describes commonly used parameter notation for these commands.
Table 90 IGMP/MLD Command Parameters
NOTATION
mvid
profile-name
This table describes the commands.
Table 91 IGMP/MLD Commands Summary
COMMAND
igmp-mld transparent
no igmp-mld transparent
igmp-mld snooping
no igmp-mld snooping
igmp-mld proxy
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DESCRIPTION
This represents a Multicast VLAN identifier. The range is [1.. 4093].
Up to 31 printable characters.
DESCRIPTION
Enables IGMP/MLD packet transparency. IGMP/MLD transparent,
snooping, proxy, and proxy-reporting can not enabled at the same
time.
Disables IGMP/MLD packet transparency.
Enables IGMP/MLD snooping. IGMP/MLD transparent, snooping,
proxy, and proxy-reporting can not enabled at the same time.
Disables IGMP/MLD snooping.
Enables IGMP/MLD proxy. IGMP/MLD transparent, snooping,
proxy, and proxy-reporting can not enabled at the same time.
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IES4005M User's Guide