I have enabled DHCP Snooping on all my new Cat 9300 access switches using the below commands
ip dhcp snooping vlan 100,110,120,130
no ip dhcp snooping information option
ip dhcp snooping
I then trusted the uplink interfaces that connect directly to the core. (ip dhcp snooping trust)
The DHCP server is connected to the core, on vlan 120, and is a MS Windows 2008 R2 server
The Voice VLAN is 110, and all clients plug their computers into the computer port on the back of the phone
Everything worked fine in my testing but today there were a ton of users on various VLANs who could not get IP addresses
To resolve, I turned off snooping for all switches, and everything was fine. I turned it back on for 1 VLAN to try to troubleshoot the issue, but I did not have a problem. It was working as expected.
Can't figure this one out. Any ideas?
