It could be half-duplex vs full-duplex on the 100Mb connections. If one switch port is trying to talk at full-duplex, but the other side of the connection (other switch's port) is trying to talk half-duplex, then performance drops dramatically. If the switches are configurable (managed), ensure that both switches are half-duplex, or both switches are full-duplex. We've run into this here, but it's been between workstations and switches, not inter-switch. Hope this helps. Brad. -----Original Message----- From: jakob krabbe [mailto:[EMAIL PROTECTED]] Sent: Thursday, December 07, 2000 1:34 AM To: retro-talk Subject: uplinking slowdown How much speed is wasted when uplinking 100MBit swiches? He have just expended and the back-up used to be something like 70 MB / min and now it's down to less than 40 MB / min! [backup switch] <- [main switch] -> [basement switch] The arrows indicates the uplink. Backup switch is an Asante, the main is a D-Link and the basement switch is an Intelswitch. This post is more a network issue rather than Retrospect but I don't know where to turn and I know there are many networking geeks on this list! :-) thanx, / jakob -- ---------------------------------------------------------- To subscribe: [EMAIL PROTECTED] To unsubscribe: [EMAIL PROTECTED] Archives: <http://list.working-dogs.com/lists/retro-talk/> For urgent issues, please contact Dantz technical support directly at [EMAIL PROTECTED] or 925.253.3050. -- ---------------------------------------------------------- To subscribe: [EMAIL PROTECTED] To unsubscribe: [EMAIL PROTECTED] Archives: <http://list.working-dogs.com/lists/retro-talk/> For urgent issues, please contact Dantz technical support directly at [EMAIL PROTECTED] or 925.253.3050.