The creation of network interfaces on a QinQ-encapsulated VLAN can be enabled on a system-wide level using the config>system>ip>allow-qinq-network-interface command. When enabled, the egress IOM limits are changed to allow a maximum of 11 MPLS labels instead of 12.
Table: QinQ combination (✓) and restriction (x) table lists the allowed and restricted QinQ combinations.
| SAP x.0 | SAP x.* | SAP x.y | Nw interface x.0 | Nw interface x.* | Nw interface x.y | SAP *.* | SAP *.NULL | SAP 0.* | Inverse SAP | |
|---|---|---|---|---|---|---|---|---|---|---|
SAP x.0 |
x |
✓ |
✓ |
x |
x |
x |
✓ |
✓ |
✓ |
x |
SAP x.* |
✓ |
x |
✓ |
x |
x |
x |
✓ |
✓ |
✓ |
x |
SAP x.z |
✓ |
✓ |
✓ |
x |
x |
✓ |
✓ |
✓ |
✓ |
✓ |
Nw interface x.0 |
x |
x |
x |
x |
x |
✓ |
✓ |
✓ |
✓ |
x |
Nw interface x.* |
x |
x |
x |
x |
x |
x |
✓ |
✓ |
✓ |
x |
Nw interface x.z |
x |
x |
✓ |
✓ |
x |
✓ |
✓ |
✓ |
✓ |
x |
SAP *.* |
✓ |
✓ |
✓ |
✓ |
✓ |
✓ |
x |
✓ |
✓ |
✓ |
SAP *.NULL |
✓ |
✓ |
✓ |
✓ |
✓ |
✓ |
✓ |
x |
✓ |
x |
SAP 0.* |
✓ |
✓ |
✓ |
✓ |
✓ |
✓ |
✓ |
✓ |
x |
x |
Inverse SAP |
x |
x |
✓ |
x |
x |
x |
✓ |
x |
x |
x |