Just to inform those who are using ERS4850 with 5.8.2 code. I just had this code installed on several ERS4850 stacks last weekend and this week strange connectivity issues started happening.
After some troubleshooting, I noticed that several connected devices (access points, clients, audio/video devices) were not receiving a valid IP-address.
Since DHCP server was working correctly, as well as some other devices and clients still were communicating on the same switch stack, I did set the DHCP snooping setting on a specific interface to trusted. And voila, the device immediately started working again!
This issue is currently under investigation by Avaya and seems to be a DHCP snooping bug in 5.8.2.
As I workaround of this issue set all ports to trusted or disable DHCP snooping globally. Be aware that this can allow DHCP rogues to be actrive in the network.
Lets hope Avaya is able to resolve this issue quickly.
Jeroen