I am facing STP issue in my network.
I configured STP protocol in two branches like Building A and Building B both are Cisco SG300 24 port switch.
I configured dual Link primary and secondary which is connected in GE25 and GE26 Since 1.5 years working normal. (GE25 is the ROOT port and GE26 is the alternate)
right now i am facing some issue like getting packet drops and flapping.
While i am checking the logs and States is continuously changing the states listening, forwarding and blocking and some time port status is getting down and Up
Any one help us to resolve the issue