...
interface gigabitethernet1/0/19
switchport mode trunkcustomer
switchport trunk allowed customer vlan add 100
exit
!
interface gigabitethernet1/0/20
switchport mode trunkcustomer
switchport trunk allowed customer vlan add 100
exit
...
interface gigabitethernet1/0/19
switchport mode trunkcustomer
switchport trunk allowed customer vlan add 100
exit
!
interface gigabitethernet1/0/20
switchport mode trunkcustomer
switchport trunk allowed customer vlan add 100
exit