spanning-tree mode rapid-pvst
spanning-tree extend system-id
spanning-tree vlan 1-2,4-6,18-19,26,28,110-111,500-501 priority 36864

interface Port-channel6
 switchport mode trunk
 switchport nonegotiate
 speed nonegotiate
  
 
 interface GigabitEthernet0/11
 switchport mode trunk
 switchport nonegotiate
 speed nonegotiate
 channel-group 6 mode active
 spanning-tree portfast
!
interface GigabitEthernet0/12
 switchport mode trunk
 switchport nonegotiate
 speed nonegotiate
 channel-group 6 mode active
 spanning-tree portfast