EtherChannel and STP

[a.m]

Hello,

I configured an ether-channel between S1 and S3.

All the switches are in the same vlan, and PVST+ is enabled on all of switches.

Now, I don't understand why does S2 have one link up connected to each switch ? does it not create a loop by this behavior ?

I tried to shutdowns all interfaces of S2 but It returns to this state.

S1

https://pastebin.com/CJwu2mYg

S2

https://pastebin.com/3SU7E8xs

S3

https://pastebin.com/3Kehxir6

Kind regards.

[Reza Sharifi]

Hi,

Can you post the output of "sh ether-cha summary" for each switch?

HTH