...
exit
!
hostname SW1
!
interface gigabitethernet1tengigabitethernet1/0/11
switchport mode trunk
...
switchport forbidden default-vlan
exit
!
interface gigabitethernet1tengigabitethernet1/0/23
...
exit
!
hostname SW2
!
interface gigabitethernet1tengigabitethernet1/0/11
switchport mode trunk
...
switchport forbidden default-vlan
exit
!
interface gigabitethernet1tengigabitethernet1/0/12
switchport access vlan 4
...