the port is user port connecting to PC. Switch is catalyst 4510. Can’t provide the actual logs at the moment but got below from net. Below has 2 link downs…in my case some ports has more than 100 link downs while the actual port is not down. So when the troubleshooting actual port down, just curious how relevant and why dtp has counts even when it has configured as access port.
Statistics ---------- 683072 packets received (683072 good) 0 packets dropped 0 nonegotiate, 0 bad version, 0 domain mismatches, 0 bad TLVs, 0 bad TAS, 0 bad TAT, 0 bad TOT, 0 other 682938 packets output (682938 good) 682938 native, 0 software encap isl, 0 isl hardware native 0 output errors 0 trunk timeouts 0 link ups 2 link downs, last link down on Wed Sep 23 2015, 16:57:01
If this is a user port then user might reload or turned off and on his/her PC.
Then link will go down.
DTP is Cisco proprietary protocol and used to negotiate forming a trunk between two Cisco devices
In this case you don`t need to check it because you have a user connected to it, not a switch.