Dell PowerConnect J-8216 Software Guide for JUNOS version 10.3 - Page 2124

Dell PowerConnect J-Series Ethernet Switch Complete Software Guide for Junos OS report indicates that the host wants to join the multicast group and receive packets from all sources. The switch creates a (*, G,V) route in this case also. Related • Understanding Multicast VLAN Registration on J-EX Series Switches on page 2052 Documentation • Example: Configuring IGMP Snooping on J-EX Series Switches on page 2055 • Configuring IGMP Snooping (CLI Procedure) on page 2063 • RFC 3171, IANA Guidelines for IPv4 Multicast Address Assignments at http://tools.ietf.org/html/rfc3171 Understanding Multicast VLAN Registration on J-EX Series Switches How MVR Works 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 J-EX Series 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 2052 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. 2052