What Is the Use of the Inner VLAN ONT in FTTH

Hello,

Generally, it is used to identify users. Double-layer VLANs are used to identify specific users. Inner VLANs are not consistent among different users.

Thanks

Hi Jul_ang!

- User VLAN: VLAN carried by packets going upstream from user-side devices (such as a home gateway), U-VLAN for short.
- C-VLAN: VLAN added based on the ONT/ONU port. For details, see the description of the Double-tagged VLAN S+C.
- Double-tagged VLAN S+C: C indicates the inner VLAN (C-VLAN) and S indicates the outer VLAN (S-VLAN).
- Double-tagged VLAN S+C': C' indicates the translated inner VLAN (C'-VLAN) and S indicates the outer VLAN (S-VLAN).
- Single-tagged S-VLAN: Single-tagged VLAN marked or translated by the OLT. It is generally used in a single-tagged VLAN translation scenario.
- C<->S+C': Bidirectional VLAN translation: translates the C-VLAN and then adds an S-VLAN.
- C<->S+C: Bidirectional VLAN translation: maintains the C-VLAN and adds an S-VLAN.


https://support.huawei.com/enterprise/en/doc/EDOC1000103809/952de771/principle-of-voice-service-data-plan