How can we detect unexpected states of STP on a particular network consisting of 4 swtiches keeping in view that the topolgy of the netwrok is unchanged.
The problem actually has occured in the 196.1.65.xxx network of our college. Four switches , each with redundant links (one 100 Mbps and one 1Gbps link) are connected. Three of the switches are connected to the main switch via 1Gbps link and there 100 Mbps links are connected to the fourth switch. On all switches the STP is enabled asusual but the state of the protocol is unstable.
Please let me know how to detect the fault and reach to a possible solution.
Perhaps you should consider to use SNMP TRAPS and LOGGING from your switches. Enable this features and check the logs for information. Every time a change is made with in your STP domain, a trap will be send.
Otherwise start debug in a switch..debug spanning-tree
If you dont have SPANNING-TREE PORTFAST enabled on user ports, the STP will its algotrim because the topology is changed every time a computer reboots/shutdown/starts.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...