DHCP request problem with VLAN/ACL

[Matt Hobbs]

This is unrelated to the current issue, but with MSTP you should define workstations as edge-ports:

spanning-tree edge-port

Otherwise everytime a PC gets rebooted, it will cause a topology change which can decrease performance on your network. Right now you're seeing a significant amount of topology changes. Also make sure to update the 2600's firmware.

Back to the current issue, have you been able to verify if the DHCP requests are coming through to the DHCP server from different VLANs by running ethereal on it or something?

By the sounds of it they are not, if you haven't done already so I think now is the time for a reboot of that switch - everything else seems to be right from what I can see.

[ProTest]

> spanning-tree edge-port
> Right now you're seeing a significant amount of topology changes.

Thanks for the advice

>Also make sure to update the 2600's firmware.
All switches are at the latest firmware H_08_98 (2626) and K_11_33 (5400)

> Back to the current issue, have you been able to verify if the DHCP requests are coming through to the DHCP server from different VLANs by running ethereal on it or somethingg

I will reboot all switches this weekend and see what happens next week

[ProTest]

The problem has been resolved by reconfiguring MSTP and the network reboot

The reboot made a hot ipconfig/renew action work, changing edge port to Yes made a cold ipconfig/renew action work as well.

Thanks for the support!

[stieven struyf]

I had exactly the same problem last week on a 5412zl chassis.
dhcp relay didn't work, didn't knew why.
reboot of the switch solved it.