Tshoot Notes: Layer 2 Commands

VLANs
#show vlan
#show vlan id XX
#show vlan brief

DTP - dynamic trunk protocol
#show int trunk
# show int fa0/1 switchport | ex private|unknown

Troubleshooting VTP
#show cdp neighbors
#show int trunk
#show vlan brief | exclude 100
#show vtp status
#show vtp password

Troubleshooting STP
#show spanning-tree vlan 200
#show spanning-tree vlan 200 bridge
#show spanning-tree vlan 200 root
#show spanning-tree vlan 200 summary
#show spanning-tree vlan 200 details

Troubleshooting MSTP
#show spanning-tree mst 1
#show run | begin spanning tree
#show run | inc priority

Troubleshooting Etherchannel
#show int po1 switchport
#show etherchannel summary
#show int trunk#show spanning-tree vlan 10
#show cdp neighbors
#show run | inc FastEthernet|channel-group