07-26-2023 08:42 AM
I have 3 access switch C9200 POE stacked and connected to 2 core switch stacked. Access and core switch are connected via LC-LC single mode fibre. However ports on both core switch 1 connected to access switch is showing up and green but the port between core switch 2 to access switch is showing up and green on core switch 2 while on access switch is showing down. Also access SW port is not blocked by STP (rapid pvst is enable). Also I can reach to internet through LAN cables connecting to RJ 45 ports of all 3 access SW. Can someone look into it and help me on this ?
Abbreviation - port= SFP port
For more info please refer to diagram.
Thanks!
Solved! Go to Solution.
07-26-2023 11:21 AM
I tried that earlier but port doesn't come up.
07-26-2023 11:51 AM
I tried that earlier but port doesn't come up.
So, that is not an STP issue. Most likely a layer-1 (physical) issue.
HTH
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