mDNS Gateway
The mDNS gateway, running on a switch, will listen for Bonjour responses and Bonjour queries and forward them to different subnets. Its main function is to forward Bonjour traffic by retransmitting the traffic between reflection enabled VLANs. The switches are configured interfaces in the VLANs for which they are performing packet reflection.
NOTE:
The mDNS gateway in a switch acts as an application layer gateway between subnets. An IP interface is required on each of the network that it is reflecting between.