So I've got the following, weird problem:
A bunch of workstations and servers are connected to a ProCurve 2404vl switch. SOMETIMES the workstations take ages to get an IP address from the DHCP server (Windows 2008R2, connected to that same ProCurve) and I can't figure out why ... it seems like the DHCP server doesn't get any requests from the workstations, like he can't see them FOR A WHILE ... until suddenly he does, and then the workstations get their IP address and everything works fine again ...
As a test I've now connected a second, small switch to the ProCurve and connected some of the workstations to that second, small switch. Now these workstations ALWAYS get an IP address, even in situations where the other workstations do not! So it seems like the second switch is filtering out something that prevents the DHCP server from seeing the requests made by the workstations?
Does anyone have any ideas what could be the problem?
Note: I've just replaced the ProCurve chassis > unfortunately the problem remains! So it was not a hardware problem (the problem also appears on connections on all 4 port modules so I doubt it's because of a defective module either).