25.3.1 Overview

The tag translation functionality converts the VLAN ID field in the VLAN tag of a frame to another value when Layer 2 switch forwarding is performed for tagged frames. This functionality allows existing VLANs with different VLAN IDs set to be connected as a single VLAN.

The tag translation functionality is specified for the trunk port. When the tag translation functionality is not used, the VLAN ID of a given VLAN is used as the VLAN ID field of the VLAN tag. When the tag translation functionality is used, the ID is used.

The figure below shows an example configuration for the tag translation functionality. In the figure, the tag translation functionality is unspecified for port 1, but set for port 2 and port 3, so that the VLAN ID fields of VLAN tags are converted and their frames are forwarded. Also, when frames are received, those with VLAN tags whose ID is that set for each port are handled by VLAN 100.

Figure 25-2 Example of Tag conversion configuration