Design Reference

Figure 42: IP multicast over SPBM streams
The following steps describe how multicast senders and receivers connect to the SPBM cloud using
BEBs, as illustrated in the preceding figure:
1. The sender sends multicast traffic with group IP address 233.252.0.1.
2.
After the BEB receives the IP multicast stream from the sender, the BEB allocates data I-SID
16000001 for the S,G multicast stream. The BEB sends a link-state packet with the Internet
Protocol multicast (IPMC) TLV (for Layer 2 VSN and Layer 3 VSN) or Internet Protocol
Virtual Private Network (IPVPN) TLV (for IP shortcuts for multicast) with the transmit bit set.
The BEB also sends an IS-IS service identifier and unicast address sub-TLV (where the
unicast address has the multicast bit set and the I-SID is the data I-SID).
3. The receiver sends a join request to group 233.252.0.1.
4. The BEB (acting as the IGMP querier) queries the IS-IS database to find all senders for
group 233.252.0.1. If the group exists, the BEB sends an IS-IS service identifier and unicast
address sub-TLV (where the unicast address has the multicast bit set and the nickname is
the stream transmitter BEB and the I-SID is the data I-SID). If the requested stream does not
exist, the BEB keeps the IGMP information, but no further action is taken.
5. IS-IS acts dynamically using the TLV information it receives from BEBs that connect to the
sender and receivers to create a multicast tree between them, and the data starts flowing
from the sender.
For conceptual and configuration information on IP multicast over SPBM, see Configuring Avaya
VENA Fabric Connect on Avaya Virtual Services Platform 4000 Series, 7200 Series, and 8000
Series, NN47227-510.
Reference architectures
January 2015 Network Design Reference for Avaya VSP 4000 Series 91
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