Hey all, trying to figure out what my distro switchports are going into err-disabled (channel-misconfig error) when the access switch uplinks are plugged in.
I have 2 3750xs connected to the same 6506-E. Below are their configs.
3750x / po11 work great. The second switch with po12 won't make a solid connection. As soon as the uplink is no shut, the distro switchport goes into err-disabled.
What stands out to me is the po12 switch doesn't have "switchport nonegotiate" on it. Could that cause the issue? Thanks for any insight!
3750x - access switch that works
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Interface Port-channel11
Switchport trunk encapsulation dot1q
Switchport mode trunk
Switchport nonegotiate
!
Gi1/1/1
Switchport trunk encapsulation dot1q
Switchport mode trunk
Switchport nonegotiate
Channel-group 21 mode on
!
3750x - access switch that doesn't work
Interface Port-channel12
Switchport trunk encapsulation dot1q
Switchport mode trunk
!
Gi1/1/2
Switchport trunk encapsulation dot1q
Switchport mode trunk
Channel-group 12 mode on
!
6506-E - distribution switch
!
Interface Port-channel11
Switchport
Switchport trunk encapsulation dot1q
Switchport mode trunk
Spanning-tree guard root
!
Interface Port-channel12
Switchport
Switchport trunk encapsulation dot1q
Switchport mode trunk
Spanning-tree guard root
!
Interface Gi1/1/1 (working)
!
Switchport
Switchport trunk encapsulation dot1q
Switchport mode trunk
Channel-group 11 mode on
Spanning-tree guard root
!
Interface Gi1/1/2 (err-disables)
!
Switchport
Switchport trunk encapsulation dot1q
Switchport mode trunk
Channel-group 12 mode on
Spanning-tree guard root
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