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AS400 - Cat 3508 Problem

AS400 with two NICS, one a 1GB over FO and the otherone is 100Mbps over UTP. The AS400 is connected to a 3508 (with GB modules)by the GB NIC and to a CAT 3524 by the 100Mbps GB.

The GB NIC is the onlyone that runs tcp/ip, the a00Mbps NIC attends the request of a Netware for SA server.

I am having the following problem:

The users sessions are disconnected (mainly by the GB NIC). I monitored the network with Sniffer pro and there are not Layer 2 or layer 1 problems (0 CRCs, 0 Alingments, 0 runts, etc).

The only error (200 per 30 min)is a "idle too long" reported by the Sniffer Pro, but I thing it is because people let the session open while is taking a cup of coffeee for example.

The average Brroadcasts per second is 12, is this too high?.

thanks for any ligh to help me solve this problem.