VLAN Mapping
VLAN mapping is a feature that allows you to translate VLAN IDs on one switch to other VLAN IDs on another switch. That way, you can refer to the same VLAN with different VLAN IDs on different switches. This is helpful, particularly in a Metro Ethernet scenario, where the ISP is asked to send specific VLAN IDs across its infrastructure. If the customer VLAN ID numbers are already in use in the ISP’s infrastructure, then these are translated for transmission over the ISP, and are typically re-translated to their original values when they reach the remote customer site.
Links:
https://forum.networklessons.com/t/vlans-intervlan-and-standby/13424/4?u=lagapides