I have this reoccurring problem that's been happening in our environment for some time now regarding IP phones (specifically, Shoretel phones) and LLDP-MED with Netgear Prosafe M4300 switches.
Basic config looks like this:
vlan 100 "Phones"
vlan 200 "LAN"
!
voice vlan
!
int 1/0/1
desc "Phone/PC"
voice vlan 100
switchport mode access
switchport access vlan 200
LLDP-MED is enabled by default on all switchports. The phones tag themselves for VLAN 100 as soon as they come up thanks to LLDP magic, they DHCP on VLAN 100, including scope option 156 (ftpservers=x.x.x.x, layer2tagging=1, vlanid=100), they download their config from Director, and everything works great!
...until it doesn't. At some point, LLDP just stops working altogether. This means the phones will drop into the LAN for DHCP instead.
I have possible workarounds to this issue (primarily adding Option 156 to the LAN so the phones can at least FTP the conf files they need, and adding the LAN subnet to the site config so they can at least make calls), so I'm not concerned about that. My concern is that LLDP just stops working until the stack is rebooted. I had this issue with two different sites today, and both switches only have an uptime of 18 days.
Switch firmware is 12.0.7.10 and the switches are in a stack config (usually with a couple of M4300-12X12F). I haven't seen this issue on our standalone switches. Or at least, I haven't noticed it yet.
My primary question is: does anyone know WHY LLDP suddenly stops working? Has anyone experienced this issue with other vendors?
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