The IPv6 neighbor
discovery (ND) multicast suppress feature stops as many ND multicast neighbor
solicit (NS) messages as possible by dropping them (and responding to
solicitations on behalf of the targets) or converting them into unicast
traffic. This feature runs on a layer 2 switch
and is used to reduce the amount of control traffic necessary
for proper link operations.
When an address is
inserted into the binding table, an address resolution request sent to a
multicast address is intercepted, and the device either responds on behalf of
the address owner or, at layer 2, converts the request into a unicast message
and forwards it to its destination.