Avaya 8800 Planning And Engineering page 179

Figure 77: Redundant MBR configuration
For a proper redundant configuration, ensure that the links use two separate VLANs (see the
following figure). Ensure that the unicast routes and DVMRP routes always point to the same
path.
Planning and Engineering — Network Design
Protocol Independent Multicast-Sparse Mode guidelines
November 2010 179