Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 2651

Chapter 82: Examples: IGMP Snooping and Multicast Configuration
In transparent mode, the switch receives one copy of each IPTV multicast stream and
then replicates the stream only to those hosts that want to receive it, while forwarding
all other types of multicast traffic without modification. Figure 1 shows how MVR operates
in transparent mode.
In proxy mode, the switch acts as a proxy for the IGMP multicast router in the MVLAN for
MVR group memberships established in the MVR receiver VLANs and generates and
sends IGMP packets into the MVLAN as needed. Figure 2 shows how MVR operates in
proxy mode.
This example shows how to configure MVR in both transparent mode and proxy mode
on an EX Series switch. The topology includes a video server that is connected to a
multicast router, which in turn forwards the IPTV multicast traffic in the MVLAN to the
Layer 2 network.
Figure 52 on page 2548 shows the MVR topology in transparent mode. Interfaces P1 and
P2 on Switch C belong to service VLAN s0 and MVLAN mv0 . Interface P4 of Switch C
also belongs to service VLAN . In the upstream direction of the network, only non-IPTV
s0
traffic is being carried in individual customer VLANs of service VLAN . VLAN is an
s0 c0
example of this type of customer VLAN. IPTV traffic is being carried on MVLAN mv0 . If
any host on any customer VLAN connected to port P4 requests an MVR stream, switch
C takes the stream from VLAN and replicates that stream onto port P4 with tag
mv0
. IPTV traffic, along with other network traffic, flows form port P4 out to the Digital
mv0
Subscriber Line Access Multiplexer (DSLAM) .
D1
Copyright © 2010, Juniper Networks, Inc. 2547