Why inner tags are removed when the VLAN-Mapping transparently transmits double-tagged packets after the VLAN-Stacking is configured

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In S2752, S3752, S5752EI V100R003, and subsequent versions, after the VLAN-Stacking and VLAN-Mapping are configured on outbound ports, inner tags are removed when cross-chip double-tagged packets are transparently transmitted, interrupting services. During the configuration, set the two ports for forwarding to the same chip.

Other related questions:
Can a bridge transparently transmit packets carrying VLAN tags
A bridge on an AR router supports the transparently transmission of VLAN packets. However, a VLANIF interface does not support the transparently transmission of VLAN packets. It is not recommended that the transparent transmission of VLAN packets should be performed on sub-interfaces.

Do network bridges transparently transmit packets with VLAN tags
Yes, network bridges transparently transmit packets with virtual local area network (VLAN) tags. VLANIF interfaces, however, do not transparently transmit packets with VLAN tags. Using sub-interfaces to transparently transmit packets with VLAN tags is not recommended.

Can the switch add double VLAN tags to untagged packets
The switch running V200R003 and a later version can add double VLAN tags to untagged packets, but the S5700EI and S5700SI do not support this function.

Whether the bridge can be transparently transmitted packets carrying VLANTAG
The AR routers bridge supports VLAN transparent transmission,VLANIF interface does not support encryption, the sub interface is not recommended.

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.

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