How to process Vlan 0 packet ?

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The S and E Switch will process VLAN0 packets as follows�?if VLAN ID is 0,mean that there is no virtual network identifier in the frame, only carry priority.
if the VLAN 0 packet can match traffic policy or ACL, this packet will be processed as Tagged packet, if can not match, the VLAN 0 packet will be processed as untagged packet, it will be added a default tag.

Other related questions:
How does an interface enabled with VLAN mapping process a packet without a C-VLAN tag
If the VLAN ID of the packet is within the range of C-VLANs, the VLAN tag is replaced according to the configuration. If the VLAN ID of the packet is out of the range of C-VLAN IDs or the packet does not carry any tag, the packet is processed as follows: If qinq vlan-translation miss-drop is used, the packet is discarded directly. If the qinq vlan-translation miss-drop command is not used on the interface but the default VLAN ID is used, packets are tagged with the default VLAN ID before being forwarded. NOTE: When an interface configured with VLAN mapping received a packet with the C-VLAN ID out of the specified range, the interface transparently transmits the packet through the normal forwarding version if the interface is added to the VLAN of the packet.

Congestion management mechanism on an S series switch
On S series switches (except S1700), each physical port has eight sending queues numbered from 7 to 0 in descending order of priority. Queue 7 has the highest priority and queue 0 has the lowest priority. Sending ports support the following queue scheduling modes: PQ, WRR, DRR, PQ+WRR, and PQ+DRR. When PQ+WRR or PQ+DRR is used, packets in PQ queues are scheduled first. The PQ queue with the highest priority is scheduled preferentially and then PQ queues with lower priorities are scheduled in succession. After all PQ queues are scheduled, WRR or DRR queues are then scheduled. For WRR and DRR queues, the queues are scheduled to ensure bandwidth first and then scheduled based on weights. The S5720HI fixed switch and X series cards of S series modular switches do not support WRR and PQ+WRR scheduling.

How do S series switches handle packets with all-0 MAC addresses
You can configure an S series (except the 1700) and E series switch to discard or forward packets with all-0 source or destination MAC addresses. The drop illegal-mac enable command enables a switch to discard packets with all-0 MAC addresses. By default, a switch does not discard packets with all-0 MAC addresses. The drop illegal-mac alarm command configures a switch to generate an alarm when receiving packets with all-0 MAC addresses. Note: The drop illegal-mac alarm command allows a switch to generate only one alarm. To enable the switch to generate more than one alarm. reconfigure the drop illegal-mac alarm command.

How does a QinQ-enabled interface process a received packet that carries the non-C-VLAN tag
If the VLAN ID of the packet is within the configured QinQ C-VLAN range, the VLAN tag is added to the packet according to the configuration. If the VLAN ID of the packet is not within the configured QinQ C-VLAN range or the packet does not carry any tag, the packet is processed as follows: If the qinq vlan-translation miss-drop command is used, the packet is directly discarded. If the qinq vlan-translation miss-drop command is not used on the interface but the default VLAN ID is used, packets are tagged with the default VLAN ID before being forwarded.

How does an S series switches process received routing protocol packets
Q: How does an S series switches process received routing packets? A: After receiving a routing protocol packet, an S series switches sends it to the MPU. After calculation, the MPU delivers control messages to an LPU for routing information updates.

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