We’ve just recently come across this problem and I thought it would be a great topic to share and perhaps even solicit some feedback from others. As you might already know I’ve been deploying ADAC across a large number of Nortel Ethernet Routing Switch 5520s with great success. ADAC allows the switch to control the phones voice VLAN configuration.
Well we also ran into a problem after upgrading a number of those switches to v188.8.131.52. A network administrator had made VLAN changes to various ports on the switch prior to the upgrade but after ADAC had been enabled on the ports. After the upgrade the switch ports defaulted back to the original VLAN they were configured for when ADAC was first enabled. We performed some additional testing and found that this problem would occur if the switch was just reset (rebooted) so it doesn’t appear to be tied to the upgrade but rather the action of restarting the switch. Looking at how ADAC works I can understand the problem but I’m disappointed that Device Manager or the CLI interface doesn’t throw a warning when you try to change the VLAN configuration of a port with ADAC enabled.
The lesson here is that you should disable ADAC on any port where you intend to change the VLAN membership.
Anyone else seen this?