Make sure MRTG is using SNMPv2 when it does its data gathering otherwise you'll suffer from counter rollover. -----Original Message----- From: Deric Kwok [mailto:deric.kwok2000@gmail.com] Sent: Friday, February 06, 2009 1:44 PM To: nanog@nanog.org Subject: Networking performance Hi I would like to ask your professional experience about switch throughput I have Gig Switchs eg: H P3400 /3500, cisco c4 948../ dlink In their spec, they said that it can handles Gig So far, I couldn't see their ports are used up over 200M in mrtg graph when I try to transfer 3G size files to files between computers ls there any limitation in those switchs? or I have to do configuration eg: put it full duplex instead of auto Thank you for your help This e-mail message and any files transmitted with it contain confidential information intended only for the person(s) to whom this email message is addressed. If you have received this e-mail message in error, please notify the sender immediately by telephone or e-mail and destroy the original message without making a copy. Thank you. Neither this information block, the typed name of the sender, nor anything else in this message is intended to constitute an electronic signature unless a specific statement to the contrary is included in this message.