Design Reference

Figure 19: Multicast SMLT triangle
Use an edge device that supports a form of link aggregation. Disable spanning tree on the link
aggregation group on the edge devices. Enable either Virtual Router Redundancy Protocol (VRRP)
BackupMaster or Routed SMLT (RSMLT) Layer 2 Edge on the switch cluster core.
Related Links
Layer 3 switch clustering and multicast SMLT on page 62
Square and full-mesh topology multicast guidelines
A square design connects a pair of aggregation switches to another pair of aggregation switches. A
square design becomes a full-mesh design if the aggregation switches are connected in a full-mesh.
Virtual Services Platform 4000 supports Layer 3 IP multicast (PIM-SM only) over a full-mesh SMLT
or RSMLT configuration.
In a square design, configure all switches with PIM-SM. Place the bootstrap router (BSR) and RP in
one of the four core switches; Avaya recommends that you place the RP closest to the source. If
using PIM-SM over a square or full-mesh configuration, enable the multicast smlt-square
flag.
The following three figures show switch clustering configurations with two-switch cluster cores and
dual-connected edge devices.
Layer 3 switch clustering and multicast SMLT
66 Network Design Reference for Avaya VSP 4000 Series June 2015
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