Is this a syslog message? if so can you paste the whole message please even two lines or more? mainly this is what comes to my mind and searched Cisco and got the same result;نوشته اصلی توسط shana
If you see these messages frequently for a particular port, the link is flapping (losing and regaining link constantly), and you should investigate the cause. Typical causes of link flapping on a switch port include:
You can check the Host cabling or NIC, and you can read more on this error Here.
- speed/duplex mismatch
- faulty cable
- faulty network interface card (NIC) or other end station problem
- faulty switch port
- other misconfiguration