2 access switches 3750 and 2960 have resilient connections to 6500 distribution switches. Clients on each access switch download a 15MB file from a server in the server farm. Client on 2960 takes 8minutes, Client on 3750 takes 60minutes, switch clients around and the client on the 2960 still takes 8 mins
We are just using transfer to simulate conversation between the endpoints as the client authenticate and talk to the server through the transaction. We bypassed the network and placed a test pc on the same switch as the server and got the same result.
I have attached a pic of the tests we carried out, in the end we put in a workaround on 3750 to use queue-set 2 with a larger buffer.
switch(config)# int FastEthernet1/0/1 switch(config-if)# queue-set 2
Not convinced with the solution though, I was thinking if the server is sending too much (over 100mb) then the pc should send a backoff message, but pc acts differently when on 3750 - output drops on the switchport interface slow transaction, when on 2960 - no output drops on the switchport interface fast transaction
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