avoid the switch become as root

I have a strange question. our all switches are PC62XX with firmware 3.3.11.2. We now have switches network and work very well, we have added another pass for our new development environment. but question is when I connect to the LAN switch development spend we loose our network and all the network goes down. I have no loop on both switches. cause I use a single cable to connect to each other switch.

I thank you, I think you're right, so we did, map all and put switch into service order root connected to LAN firewall,

now I know why I have this problem. This first two separate network and was never connected to each other. but our new requirement in order to test the team having access side.so development we need to connect.

By following cables, I found that the switch we first tries to connect to the network development was hop 4 against root switch. so as usual, bdpu will elect a narrow path from the root. I move that root switch and cable close to issue resolved.

It was a lesson for me to understand the Spanning tree bpdu. process. that I will never forget.

Thanks for your help.

Tags: Dell Switches

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