It depends. Think of Bonjour Gateway instances as sniffers on VLANs; you require as many instances as sniffer points required in your network to discover the VLANs and subnets of interest. If you deploy one Bonjour instance connected to a trunk port, and that port has visibility to two subnets and different VLANs, then you would require only one Bonjour Gateway instance to scan the VLANs and bridge Bonjour Services between those subnets. If you have a 3rd subnet that is not detectable from that trunk port, then you would need to deploy a second Bonjour Gateway instance in that location to bridge that 3rd subnet to the services in the first instance. Please refer to the free Bonjour Configuration Guide for deployment examples.
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