Understanding Multicast Vlan Registration On Ex Series Switches; How Mvr Works - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

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Understanding Multicast VLAN Registration on EX Series Switches

How MVR Works

2540
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OS for EX Series Ethernet Switches, Release 10.4
report indicates that the host wants to join the multicast group and receive packets from
all sources. The switch creates a
Understanding Multicast VLAN Registration on EX Series Switches on page 2540
Example: Configuring IGMP Snooping on EX Series Switches on page 2543
Configuring IGMP Snooping (CLI Procedure) on page 2551
RFC 3171, IANA Guidelines for IPv4 Multicast Address Assignments at
http://tools.ietf.org/html/rfc3171
Multicast VLAN registration (MVR) allows you to efficiently distribute IPTV multicast
streams across an Ethernet ring-based Layer 2 network and reduce the amount of
bandwidth consumed by this multicast traffic.
In a standard Layer 2 network, a multicast stream received on one VLAN is never
distributed to interfaces outside that VLAN. If hosts in multiple VLANs request the same
multicast stream, a separate copy of that multicast stream is distributed to the requesting
VLANs.
MVR introduces the concept of a multicast source VLAN (MVLAN), which is created by
MVR and becomes the only VLAN over which IPTV multicast traffic flows throughout
the Layer 2 network. The Juniper Networks EX Series Ethernet Switch that is enabled for
MVR selectively forward IPTV multicast traffic from interfaces on the MVLAN (source
interfaces) to hosts that are connected to interfaces that are not part of the MVLAN.
These interfaces are known as MVR receiver ports. The MVR receiver ports can receive
traffic from a port on the MVLAN but cannot send traffic onto the MVLAN, and they
remain in their own VLANs for bandwidth and security reasons.
This topic includes:
How MVR Works on page 2540
In many ways, MVR is similar to IGMP snooping. Both monitor IGMP join and leave
messages and build forwarding tables based on the media access control (MAC)
addresses of the hosts sending those IGMP messages. Whereas IGMP snooping operates
within a given VLAN to regulate multicast traffic, MVR can operate with hosts on different
VLANs in a Layer 2 network to selectively deliver IPTV multicast traffic to requesting
hosts, thereby reducing the amount of bandwidth needed to forward multicast traffic.
When you configure an MVLAN, you assign a range of multicast group addresses to it.
You then configure other VLANs to be MVR receiver VLANs, which receive multicast
streams from the MVLAN. The MVR receiver ports comprise all the interfaces that exist
on any of the MVR receiver VLANs. Interfaces that are on the MVLAN itself cannot be
MVR receiver ports for that MVLAN.
route in this case also.
(* , G,V)
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