I have several Layer 2 small business switches hosting several VLAN's. All routing is done on our firewall.
With the exception of a few phones, all other VLAN's are working as they should.
All end point, switch ports, are set up as Access ports, and all ports between switches are trunk ports.
The issue I have is with a few, not all of our Polycom phones.
Each Polycom phone has 2 ports. 1 port for the phone and 1 port to connect a PC. In this particular instance, the PC is plugged into the phone and the phone is plugged into the wall.
From the CLI, if I run
Sh MAC-Address-table dynamic
I can see the MAC address of the phone and PC assigned to the appropriate port on the switch.
I run the following commands to assign the the port to the new VLAN
switch# Conf t
switch (config)#int gi26
switch (config-if)#switchport mode access
switch (config-if)#switchport access VLAN5
switch (config-if)#no shut
At his point, I look at DHCP to make sure they pick up an address. No address appears. I look in the GUI of the switch and I see the port has been changed to a trunk port. I have had this issue with a few other phones and most of the time, if I change the port back to an access port and re-run the above commands, it it takes.
This is not isolated to just one switch. I have seen it on at least 3 different switches. An SG300, SG350, and SG500.
All switches are up to date, running the latest firmware.
I do save the running config when I am done and the switches do not reboot over night. Not sure what is prompting this behavior.
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