InGreenwood
@rr.com
 from:
fox7 
| reply to joeMI
Re: Mixing Switches and Hubs
(There is never any financial excuse to use hubs on a commercial network, the only reason to ever have one is to snoop packets)
S1) Switch2 will drop packets from Hub1 that resolve to a MAC address on Hub1. No other port on Switch2 will see packets for Hub1 that are already in Switch2's ARP table.
s2) Switch2 will bridge (not route) packets for a Mac Address on Switch1 to the port Switch1 is attached to. Switch1 will bridge (not route) packets for a Mac Address on Switch1 to the port the device is attached to.
A Hub is a multiport repeater, a switch is a multiport bridge. All broadcasts packets always light up every port, unicast packets to a MAC Address not in the ARP table light up every port. In general, it is the second through N packets that knows which port responded, so only lights up one port. |
