We have a 3650 switch running IOS-XE Gibraltar 16.12.4...standard configuration where a Windows 10 workstation is connected to an Avaya phone, which is connected to the switch port. I have this as the standard port config:
interface GigabitEthernet1/0/1
network-policy 100
switchport access vlan 200
switchport trunk native vlan 999
switchport trunk allowed vlan none
switchport mode access
switchport nonegotiate
switchport block multicast
switchport block unicast
switchport port-security maximum 3
switchport port-security
no snmp trap link-status
macro description unused | voip
spanning-tree portfast
spanning-tree guard root
service-policy input markTraffic
I'm trying to get details from the end user as to whether they do anything special, but the PC randomly goes offline, saying it has no network connectivity. When I look at the switch port, it says the PC's MAC address is in vlan 100, which is the voice vlan. Doing a "shut, no shut" resolved this the first time, but it happened again the next day.
Any thoughts on this? Could it be a CDP/LLDP thing? This happens occasionally throughout our network on switch ports like this.
