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We have 3 switches - a Core Switch, and 2 downstream switches. Each downstream switch has a 3 cable Trunk direct to the core switch.

However - when we disconnected one cable in that trunk group (still leaving 2 physical links in that trunk group online) we lost all connectivity from that switch to the core switch.

Do we need to enable STP?

PnP
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  • Are you sure all three connections in the trunk were being used? Does the same thing happen if you disconnect one of the other cables? – Chris McKeown Jun 18 '14 at 10:30
  • Yes - if we disconnect any of the cables in that trunk group, that switch can no longer talk to the core switch. – PnP Jun 18 '14 at 10:31
  • Please post the outputs of the command `show trunk` from each switch. – Rex Jun 18 '14 at 14:53

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