Layer 2 Protocol Tunneling - Dell S4048T Configuration Manual

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4 Map C-Tag dot1p values to a S-Tag dot1p value.
INTERFACE mode
vlan-stack dot1p-mapping c-tag-dot1p values sp-tag-dot1p value
Separate C-Tag values by commas. Dashed ranges are permitted.
Dynamic Mode CoS overrides any Layer 2 QoS configuration in case of conflicts.
NOTE: Because dot1p-mapping marks and queues packets, the only remaining applicable QoS
configuration is rate metering. You may use Rate Shaping or Rate Policing.

Layer 2 Protocol Tunneling

Spanning tree bridge protocol data units (BPDUs) use a reserved destination MAC address called the bridge
group address, which is 01-80-C2-00-00-00.
Only spanning-tree bridges on the local area network (LAN) recognize this address and process the BPDU.
When you use VLAN stacking to connect physically separate regions of a network, BPDUs attempting to
traverse the intermediate network might be consumed and later dropped because the intermediate network
itself might be using spanning tree (shown in the following illustration).
Service Provider Bridging 962