What are precautions for configuring VLAN mapping on multiple interfaces of the switch

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When configuring VLAN mapping on multiple user-side interfaces, do not map different C-VLAN IDs to the same S-VLAN ID. Otherwise, traffic sent from a user-side interface may be forwarded to another user-side interface that has the same S-VLAN ID configured.

Other related questions:
What are the precautions for configuring N:1 VLAN mapping
The S2752 and S3700 do not support N:1 VLAN mapping. N:1 VLAN mapping cannot be configured with port security or MAC address learning disabling. The interface configured with N:1 VLAN mapping cannot process unknown unicast, broadcast, and multicast return traffic.

Precautions for configuring MUX VLAN on S series switch
When configuring MUX VLAN on S series switches (except S1700), pay attention to the following points: 1. If a specified VLAN has been used as a principal VLAN, it cannot be configured for VLAN mapping, VLAN stacking, super-VLANs, or sub-VLANs. 2. If a specified VLAN has been used as a group VLAN or separate VLAN, it cannot be used to create VLANIF interfaces or configured for VLAN mapping, VLAN stacking, super-VLANs, or sub-VLANs. 3. Prohibiting MAC address learning on interfaces or limiting the number of MAC addresses learned on interfaces will affect the MUX VLAN function. 4. MUX VLAN and port security cannot be configured on the same interface. 5. MUX VLAN and MAC address authentication cannot be configured on the same interface. 6. MUX VLAN and 802.1x authentication cannot be configured on the same interface. 7. When both DHCP snooping and MUX VLAN are configured, a DHCP client cannot obtain an IP address if the DHCP server is at the subordinate VLAN side and the DHCP client is at the principal VLAN side. To avoid this problem, configure the DHCP server at the principal VLAN side. 8. After MUX VLAN is enabled on an interface, this interface cannot have VLAN mapping or VLAN stacking configured. 9. A VLANIF interface can be created for a principal VLAN but not for subordinate group VLANs or subordinate separate VLANs. If a VLANIF interface is created for the principal VLAN in a MUX VLAN, the port mux-vlan enable vlan vlan-id command cannot be configured on interfaces of SA cards on S series switches to enable any VLAN in the MUX VLAN, including principal and subordinate VLANs.

What are the limitations for configuring VLAN mapping on the S2700
A maximum of 16 VLANs can be mapped on an interface. The C-VLAN ID must be different from the value obtained through the modulo operation against 128 on the VLAN allowed by the interface (VLAN ID mod 128); otherwise, a conflict occurs. For example, if the interface allows VLAN 130 to pass, the result of VLAN ID mod 128 is 2. In this case, the C-VLAN ID cannot be set to 2. The S2700SI does not support VLAN mapping.

How to configure an interface to allow packets from multiple VLANs
Ethernet interfaces fall into the following types: 1. Access interface: An access interface often connects to a user terminal such as a user host or server that cannot identify VLAN tags, or is used when VLANs do not need to be differentiated. Access interfaces can add only a unique VLAN tag to untagged frames. 2. Trunk interface: A trunk interface often connects to a switch, router, AP, or voice terminal that can receive and send tagged and untagged frames simultaneously. It allows frames from multiple VLANs. 3.Hybrid interface: A hybrid interface can connect to not only a user terminal (such as a user host or server) or network device (such as a hub) that cannot identify tags, but also a switch, router, AP, or voice terminal that can receive and send tagged and untagged frames. It allows tagged frames from multiple VLANs. It allows frames from multiple VLANs.

What is the difference for global vlan mapping on different Switch?
The global VLAN Mapping means that configure Vlan Mapping in vlan view. Only S2700EI、S3700EI and S3700SI can support globlal VLAN Mapping,others can not support. All the S2700EI Switch can not support global Vlan Mapping and interface Vlan Mapping at the same time except S2750EI. S3700EI and S3700SI can support them at the same time.

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