New Trunking port Error Disabled on Nexus 5000

Question

I configured my Nexus 5000 ports as so
Int Eth1000/1/48
switchport mode trunk
switchport trunk  allowed vlan 8
speed 1000
channel-group 7 mode active
int Po7
switchport mode trunk
switchport trunk  allowed vlan 8
vpc7
speed 1000
I configured my 3650 as so:
int Gig0/23
switchport trunk encapsulation dot1q
switchport trunk  allowed vlan 8
switchport mode trunk
speed 1000
channel-group 1 mode active
Port channel 1
switchport trunk encapsulation dot1q
switchport trunk  allowed vlan 8
switchport mode trunk
speed 1000
Both of these ports are connected Int Eth1000/1/48 and int Gig0/23. Int Eth1000/1/48 shut down and when I checked the logs on the N5K it said for the port   ErrorDisabled REASON BPDUguard. I did not configure bpdufilter or bpduguard on either side. What is causing it?
I found 3 other ports the have bpdufilter on them  would that be it?
Since the 3560 is an older switch how can I also ensure it get demoted to not be root bridge or secondary root bridge?

Answer 1

Hi,
1- You tried to bundle GE and E interfaces with LACP on both switch but you did not mention the other bundle members, however, it looks the etherchannel did not comes up and interfaces work separately.
As a result, STP has prevented bridging loop and put one of them in errdisable state. I think you must check your etherchannel configuration.
2- you can use "spanning-tree vlan <> priority 61400" on 3560 switch to make sure it won't be a root bridge.
HTH
Houtan