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Thanks Doug, I will try to track down what the deal is. -----Original Message----- From: MICE Discuss <[log in to unmask]> On Behalf Of Doug McIntyre Sent: Monday, September 21, 2020 12:25 PM To: [log in to unmask] Subject: Re: [MICE-DISCUSS] MICE port down On Mon, Sep 21, 2020 at 12:21:35PM -0500, Todd Mueller wrote: >Could someone please check the MICE port for Velocity Telephone, I saw >it go down about 15 minutes ago. > >I suspect it shut down because there was more than 1 MAC address coming in. >I noticed the MAC address for a layer 2 interface from one of our >switches showing up in the corresponding VLAN momentarily for some >reason, but it is gone now. Yes, it was a MAC address security violation. I assume it'll be fine to post it, so you can find what one is causing you grief. Sep 21 12:02:46 core-sw0 PortSec: %PORTSECURITY-2-PSECURE_VIOLATION: Security violation occurred, caused by MAC address 64:9e:f3:ec:b9:73 on vlan 1 interface Ethernet4/21. Sep 21 12:02:46 core-sw0 Ebra: %ETH-4-ERRDISABLE: portsec error detected on Ethernet4/21. Sep 21 12:02:46 core-sw0 Ebra: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet4/21 (15250 - Velocity Telephone), changed state to down Sep 21 12:02:46 core-sw0 Stp: %SPANTREE-6-INTERFACE_DEL: Interface Ethernet4/21 has been removed from instance Vl1 I cleared the error from the port.