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Ethernet Interfaces and VLANs

In the absence of VLANs, Ethernet does not have a demultiplexing layer. A subscriber interface adds a demultiplexing layer for an Ethernet interface that is configured without VLANs. Using subscriber interfaces, the router can demultiplex or separate the traffic associated with different subscribers.

You can configure subscriber interfaces with VLANs. If you do so, the E-series router demultiplexes packets by using first the VLAN and then the subscriber interface.

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