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Eliminate the “M” Bit (cont.) TRILL Header field V = 0, according to protocol draft -05, indicates core IS-IS, known unicast, or unanalyzed IP based multicast. V = 1 indicates per VLAN IS-IS, broadcast, unknown unicast, or IP based multicast that should be pruned on VLAN only. So (V = 0) and (core IS-IS or inner DA unicast) => M = 0 Otherwise M = 1 |