Paramount Networking Ltd

Nokia (Alcatel-Lucent) SR-OS – Port Encapsulation

Layer 2 Port Encapsulation

My first (hopefully of many) technical blogs. OK, so port encapsulation may not sound like an exciting topic to write a piece on, but I have answered many questions on this and think it’s worth writing an article on. The SR-OS is very different to the Cisco OSs due to the the fact you must configure a port ethernet encapsulation before you can tie any services to the port. On Cisco, you set the encapsulation directly under the main or sub-interface a la:
interface GigabitEthernet0/0/0/0 ipv4 address ! interface GigabitEthernet0/0/0/0.1000 encapsulation dot1q 1000 ! interface GigabitEthernet0/0/0/0.1001 encapsulation dot1q 1000 second-dot1q 2000 !
So each sub-interface can be set to either dot1q or qinq.
But, on Alcatel-Lucent SR-OS products, the port encapsulation must first be configured before any SAPs (equivalent of sub-interfaces) can be created. There are three port modes on SR-OS that can be selected:
  • Null
  • dot1q
  • qinq


Null mode refers simply to untagged packets.  This is similar to
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