I am benchmarking download times, using tftp, of switch IOS's (around 4-6MByte files) to a central server and find that over 2Mb WAN links they can vary between 28kB/s and 4kB/s with an average on most sites of around 12kB/s. If I tranfer a 4MBye file from a PC, using FTP, through the switches, back to the central server I find that the transfer rates are between 180KB/s and 1MB/s. My question is, do the switches prioritise user data through the switch. Does the user data take precedence over the IOS tftp file transfer.
I ask the question because I am investigating why identical switches on separate sites, connected to identical 2MB/s WAN links, take up to 3 times longer to transfer files to the central server.