Alcatel-Lucent 6850-48 Network Guide

Configuring IP Multicast VLAN

IPMV Packet Flows

OmniSwitch AOS Release 6 Network Configuration Guide

page 43-7

5 The single multicast double-tagged data packets with an IPMV outer tag and a CVLAN inner tag are 
generated by the multicast server for group G1.

6 The VLAN Stacking egress logic removes the IPMV outer tag. The generated multicast data packets 
flooded on the receiver port are single-tagged with CVLAN.

Note. All the IPMS control traffic specified for a single multicast service should be tagged with the same 
CVLAN.

The following steps describe the path taken by single-tagged control packets ingressing on the receiver 
port in the VLAN Stacking translation mode:

1 The IPMS join reports for multicast group G1, which are single-tagged with the CVLAN tag (c-tag) 
are sent to the receiver port. 

2 CVLAN tags are replaced by the SVLAN tags in all the IPMS reports going to the CPU of the Ether-
net switch.

3 IPMS overwrites the SVLAN tags with the IPMV tags after IPMV table lookup.

4 A single IPMV-tagged IPMS report is sent to the multicast server for Group G1.

5 The single multicast packets single-tagged with IPMV are generated by the multicast server for group 
G1.

6 The VLAN Stacking egress logic replaces the IPMV tag with the CVLAN tag. The multicast data 
packets flooded on the receiver port are single-tagged with CVLAN.

Note. All the IPMS control traffic specified for a single multicast service should be tagged with the same 
CVLAN.