29.7.1 Using VLAN Mapping

(1) VLAN Mapping and Data-Transfer VLAN

When multiple ring IDs are set for a single device, such as in a multi-ring configuration, the same VLAN needs to be set multiple times for each ring ID. At this time, if a list of VLAN used as the data transfer VLAN (called VLAN mapping) is set in advance, the setting of the data transfer VLAN in the multi-ring configuration can be simplified, and looping due to setting errors in the configuration can be prevented.

VLAN mappings assign VLANs used for data transfer to VLAN mapping IDs. These VLAN mapping IDs are set for VLAN groups, and are managed as data transfer VLANs.

Figure 29-39: Example of assigning VLAN maps to each ring

(2) VLAN Mapping When Used with PVST+

When the Ring Protocol is used with PVST+, the VLANs used for PVST+ are also set in the VLAN mapping. In such cases, make sure that only one VLAN is assigned to the VLAN mapping. Set data transfer VLANs other than the VLANs used for PVST+ using a separate VLAN mapping, and set them in a VLAN group with the VLAN mapping used for PVST+.