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Alcatel-Lucent 6850-48 Network Guide

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IPMV Packet Flows
Configuring IP Multicast VLAN
page 43-6
OmniSwitch AOS Release 6 Network Configuration Guide
September 2009
The paths taken by the packets are described in the following subsections:
Untagged Control Packets Ingressing on the Receiver Port
The following steps describe the path taken by untagged control packets ingressing on the receiver port:
1 Untagged IPMS join reports for the multicast group G1 are sent to the receiver port.
2 The IPMS reports sent to the CPU of the Ethernet switch are single-tagged with the default SVLAN tag 
(s-tag).
3 IPMS overwrites the SVLAN tag with the IPMV tag after IPMV table lookup.
4 A single IPMS report, single-tagged with IPMV, is sent to the multicast server for group G1.
5 The single multicast data packet, single-tagged with IPMV, is generated by the multicast server for 
group G1.
6 The generated multicast data packets are flooded on the receiver port. These data packets are untagged.
C-Tag Translation Rule in the VLAN Stacking Mode
The following steps describe how the c-tag translation rule works in the VLAN Stacking 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 SVLAN tags are attached before the CVLAN tags in all the IPMS reports going to the CPU of the 
Ethernet switch.
3 IPMS overwrites the SVLAN tags with the IPMV tags after IPMV table lookup for the inner c-tag.
4 A single IPMS double-tagged report with an IPMV outer tag and a CVLAN inner tag is sent to the 
multicast server for group G1.
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.
Single-Tagged Control Packets (with CVLAN) Ingressing on the Receiver Port in 
the VLAN Stacking Double-Tag Mode
The following steps describe the path taken by single-tagged control packets ingressing on the receiver 
port in the VLAN Stacking double-tag mode:
1 The IPMS join reports for multicast group G1, single-tagged with the CVLAN tag (c-tag), are sent to 
the receiver.
 
2 SVLAN tags are attached after the CVLAN 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 for the inner c-tag.
4 A single IPMS double-tagged report with an IPMV outer tag and a CVLAN inner tag is sent to the 
multicast server for group G1.