4.14.2 Spanning Tree MSTI Configuration

The MSTI Configuration page allows the user to inspect the current STP MSTI bridge instance priority configurations, and possibly change them as well.

Figure 4-66. MSTI Configuration

The MSTI Configuration page has the following parameters:

  • Configuration Identification
    • Configuration Name: The name identifying the VLAN to MSTI mapping. Bridges must share the name and revision (see the following, and the VLAN-to-MSTI mapping configuration to share spanning trees for MSTIs (Intra-region). The name is maximum 32 characters.
    • Configuration Revision: The revision of the MSTI configuration named above. This must be an integer between 0–65535.
  • MSTI Mapping

    • MSTI: The bridge instance. The CIST is not available for explicit mapping, as it receives the VLANs not explicitly mapped.

      Note: The Traffic Engineering (TE) instance is special, as it is not controlled by MSTP itself. The TE instance will always be forwarding for all ports. The TE-MSTID is defined by IEEE 802.1Q-2018.
    • VLANs Mapped: The list of VLANs mapped to the MSTI. The VLANs can be given as a single (xx, xx being 1–4094) VLAN, or a range (xx–yy), each of which must be separated with comma and/or space. A VLAN can only be mapped to one MSTI. An unused MSTI must be left empty (that is, not having any VLANs mapped to it). For example: 2, 5, 20–40.