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uplink traffic on a switch

IT Csar
Occasional Advisor

uplink traffic on a switch

To analyze the internet bandwidth usage in a company, I mirrored uplink port on a main switch, and connected box running ntop. This setup delivered clear picture on uplink traffic, however I am getting some of the NFS traffic sourced/destined to internal network. I would expect NFS packets should never travel on uplink (may be broadcast, ARP, DHCP, but not NFS) to the router/gateway. Should main switch route NFS internal traffic w/out sending them all the way to router and back?

Thanks