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ROS™ v3.5 174 RS400
ingress edge port. This means that traffic from an individual customer is tagged with his unique
VID and, thus, segregated from other customers’ traffic.
Within the service provider network, switching is based on the VID in the outer tag.
When double-tagged frames leave the service provider network they egress a QinQ-enabled
port of another switch. The switch strips the outer tag while associating the frames with the VID
extracted from it before stripping. Thus, the frames are switched to appropriate edge ports, i.e.
to appropriate customers.
Figure 114: Using QinQ Example
Note: QinQ can only be enabled on one switch port at a time.
Note: Some RuggedSwitch
™
models only support QinQ, if all edge ports are configured with the same
PVID. In this case, a dedicated switch must be assigned to each customer.