Odd problem

[mheaven]

We just installed new 4510r+e chassis to replace our older 6509. The 4510 is a layer 2 device with 2 trunk ports port channeled back to the core. The trunk ports and port channel completely mirror that of the old switch. 

I can log into the device remotely so I know that the port channel is passing traffic as I am logging in via the management vlan. The problem is some devices are working as intended and other on the same vlan are not. Not only that, but upon a reload of the switch some devices that were working properly quit working and others that were not working are now working properly.

We are using 802.1x and upon a show auth sessions every device is authenticating to the network although not every device authenticating is pulling an ip. We point back to a DHCP server and I have verified that the helper addresses are correct. I can also ping all SVIs on the core from the new switch.

Any help would be appreciated. Thank you.

[Flavio Miranda]

@mheaven

 To start a show running-config from the device would help a lot. Mean while, do you have any kind of security related to DHCP, DHCP Snooping for example?

 Also, which specific problem are you talking about ? Of course, lack of IP address would be big problem enough. 

 Jest let me know.

-If I helped you somehow, please, rate it as useful.-

[Georg Pauwen]

Hello,

as Flavio requested, seeing the configuration would be helpful.

In older IOS versions, there used to be a command 'dot1x port-control auto' ('authentication port-control auto' in newer versions) which would cause the switch to initiate authentication when the link state of a port changes (which would be the case when you reboot the device), do you have that configured ?