At 02:58 PM 5/22/02, Kevin Jones wrote: >If a multiport bridge determines (based on the destination MAC address) that >the destination node is on another subnet,
Stop right there. It can't figure out that the destination is on a different subnet from the MAC address. Subnets are differentiated by network-layer information. MAC addresses are at the data-link layer. If the destination is on a different subnet, the destination MAC will be a router's MAC address, although the bridge (switch) wouldn't recognize that (unless it had some weird feature that did this, which is unlikely). If the bridge (switch) has learned which port reaches that MAC address, then it will forward the frame out that port and no other. If it hasn't learned how to reach that address yet, then it will flood the frame out all ports. Bridges and switches behave exactly the same. Priscilla > it will broadcast the frame out >all ports except the originating port. A switch, on the other hand, is >smart enough to only forward the frame out the destination port. Both >devices handle unknown frames and broadcasts the same way, ie. they will >forward the packets out all ports except the one the frame was received on. > >Any thoughts? ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=44753&t=44649 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
