SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
9.5.3 QinQ Tagging
When VLAN tagging is repeated it is called QinQ tagging.
QinQ tagging is useful for service providers. It allows the service provider to use
VLANs internally and combining traffic from clients that is already VLAN-tagged.
This means that a conflict between different “customers or devices” that make use
of VLAN tags is exluded. This because multiple VLAN headers are inserted into a
single Ethernet frame.
The outer tag (next to the source MAC field) is used to identify the VLAN of the
service provider.
The EL470 modem is transparent for QinQ tagging. Only a check
is performed on this feature.
QinQ-tagging is shown in Figure 93.
Figure 93 – QinQ Tagging
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