[ACX] How to configure implicit QinQ

This article provides an alternative way to configure QinQ on ACX platforms without using input-vlan-map/output-vlan-map.

On the customer vlan (C-VLAN) facing side, the ACX does not expect aspecific VLAN. Any traffic comes in will get pushed by a service VLAN (S-VLAN). It's equivalent to "vlan-id-range 1-4094". Outgoing traffic will pop the S-VLAN.

Topology:

MX xe-0/1/0 <-- S-VLAN --> xe-0/0/0 ACX xe-0/0/1 <-- C-VLAN >--> EX

MX>show configuration interfaces:

xe-0/1/0 {
flexible-vlan-tagging;
encapsulation flexible-ethernet-services;
unit 0 {
encapsulation dix;
vlan-tags outer 917 inner 15;
family inet {
address 10.10.10.2/30;
}
}
}

ACX> show configuration interfaces 
xe-0/0/0 {
description nni;
flexible-vlan-tagging;
encapsulation flexible-ethernet-services;
unit 917 {
encapsulation vlan-bridge;
vlan-id 917;
family ethernet-switching;
}
}
xe-0/0/1 {
description uni;
encapsulation ethernet-bridge;
unit 0 {
family ethernet-switching {
}
}
}

ACX> show configuration vlans         
acx-test {
vlan-id 917;
interface xe-0/0/0.917;
interface xe-0/0/1.0;
}

EX> show configuration interfaces 
xe-0/0/1 {
unit 0 {
family ethernet-switching {
interface-mode trunk;
vlan {
members test;
}
}
}
}
irb {
unit 15 {
family inet {
address 10.10.10.1/30;
}
}
}

EX> show configuration vlans 
test {
vlan-id 15;
l3-interface irb.15;
}

Verification:

ACX> show interfaces xe-0/0/1.0

  Logical interface xe-0/0/1.0 (Index 550) (SNMP ifIndex 525)
    Flags: Up SNMP-Traps 0x24004000 VLAN-Tag [  ] In(push 0x8100.917) Out(pop)  Encapsulation: Ethernet-Bridge
    Input packets : 19581
    Output packets: 18400
    Protocol eth-switch, MTU: 9216
      Flags: Is-Primary

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