Przed optymalizacją:

interface gigabitethernet2/0/1
  service instance 1 ethernet
    encapsulation dot1q 1
      bridge-domain 1
  service instance 2 ethernet
    encapsulation dot1q 2
      bridge-domain 2
  service instance 3 ethernet
    encapsulation dot1q 3
      bridge-domain 3

Po optymalizacji:

interface gigabitethernet2/0/1
   service instance trunk 123 ethernet
     rewrite ingress tag pop 1 symmetric
     encapsulation dot1q 1-3
     bridge-domain from-encapsulation