Design Reference

Figure 52: VRF scenario to move traffic between data centers
Multicast architecture
Networks today either have inefficient bridged IP multicast networks (Internet Group Management
Protocol, or IGMP) or IP multicast networks that require multiple protocols that are complex to
configure and operate. IP multicast over Fabric Connect builds on the simplicity of Avaya Fabric
Connect using SPBM for the control plane with support for bridged and routed IP multicast traffic,
without the inefficiencies or complexities that exist in other topologies today.
This functionality extends the SPBM IS-IS control plane to additionally exchange IP multicast stream
advertisement and membership information, which means that you can use SPBM for Layer 2
(unicast, broadcast, multicast) virtualization as well as Layer 3 (unicast, multicast) routing and
forwarding virtualization.
IP multicast over Fabric Connect supports three operational models:
1. Layer 2 Virtual Services Network with IGMP support on the access networks for optimized
forwarding of IP multicast traffic in a bridged network (L2 VSN with multicast)
2. IP multicast routing support for Global Routing Table using Shortest Path Bridging (SPB) in
the core (IP shortcuts with multicast)
3. Layer 3 Virtual Services Network with VRF based IP multicast routing support over SPB in
the core and IGMP on the access (L3 VSN with multicast)
All multicast streams are constrained within the level in which they originate, which is called the
scope level. In other words, if a sender transmits a multicast stream to a BEB on a C-VLAN with IP
SPBM design guidelines
108 Network Design Reference for Avaya VSP 4000 Series June 2015
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