I got a problem with my PIX515 FO unit when the interface speed and duplex is configured in fixed speed. when configuring the switch's port to where the PIX FO is connected with a speed of 100 Mbps and duplex of full, and configuring the corresponding PIX's interface with the same config as above, I get like 70% loss in the traffic passing through that interface. When i configured the switch's port in auto speed and duplex and the PIX interface in auto mode as well, the traffic flew with no problems. I have the same configuration with the Active PIX and the switch that is connected to it (i.e. the speed and duplex are fixed to 100M and full consequently) but I dont have the same problem!
Did anybody face this problem when setting the speed and duplex or has any clue about the possible cause of this?
In the early autonegotiation days, nailing speed/duplex was the best way to avoid conflicts. However, newer hardware generally gets it right, but drops back to half-duplex when in doubt. Use autonegotiation unless you run into an insurmountable conflict.
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