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mediaopt full-duplex DOES NOT work..
Authored by: Mr_Britt on Jan 28, '03 12:12:10PM
I have just gone through the same problem with our network of Mac's and PC's. We have both Cisco Catalyst 35xx-XL's and 29xx-XL's in our network that are interconnected using Gigabit Fibre. You need to stop the spanning tree protocol at port startup in these switches for the Mac's to autonegotiate the link correctly. To do this either use the Cisco Cluster Management Suite (CMS) to turn ON PortFast and set Duplex and Speed to Auto, or add the following to your ports config using telnet:
interface FastEthernet0/4      %% Your interface here
 description MacTest           %% port name
 switchport access vlan 4      %% vlan its in
 spanning-tree portfast        %% This is the only nonstandard option
!                              %% and stops STP from delaying port/link startup
This has fixed most of our network issues with Mac's and all the NIC's report the correct duplex and speed at both the switch and the machine. Hope this helps.

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