Without being too invasive, could anyone shed a little light into their network topology?
We're having some issues which we're struggling to narrow down - since we had a loopback (2 switches lost their trunking config and caused one hell of a loopback - typical that it lost the trunk config but not the loopback detection you have to disable when you set up a trunk!) we've had major network slowdowns and all the stations only connect at 100Mb as opposed to a gig.
All switches are Dlink 1210-24 units with power saving and broadcast storm control disabled. Every morning, when PC's start up they get 100Mbit connections. Switch uplinks still have a gig - this seems to occur if stations are turned off for a long time (i.e. overnight) as it doesn't seem to happen at lunchtimes. This doesn't happen to all switches, just a few.
If we force 1000Mbit rather than autonegotiation they work at full speed, however this naturally breaks WOL so is a non solution. Dlink are helping as much as they can but they're also drawing blanks.
I'm not convinced it's a switch issue however I'm slightly concerned that maybe we're just asking far too much of such cheap switches (they were certainly better than the 3com 4400's they replaced!)
We have 4 core switches which connect to all the edge devices, some via fibre, some via cat5/6, some trunked. A couple of them do (out of no choice) have daisy chained devices. Our first thought is exceeding the 48Gb throughput limit of the switches, however surely as there are 24 ports at 2Gb each, that wouldn't actually be possible? They're not overheating, they were fine a couple of weeks ago. We're still systematically working through changes that have been made in the last fortnight which includes a couple of fibre links, removal of some test servers, changing a couple of switches (there a couple evil Procurve devices propping important parts up currently).
Short of investing in a decent core switch setup which is something we're looking at anyway for the future (money, money money!) any suggestions? :)