4.13.5 Spanning Tree MSTI Ports Configuration

The MSTI Port Configuration page allows you to inspect the current STP MSTI port configurations, and possibly change them. An MSTI port is a virtual port, which is instantiated separately for each active CIST (physical) port for each MSTI instance configured on and applicable to the port. The MSTI instance must be selected before displaying actual MSTI port configuration options. This page contains MSTI port settings for physical and aggregated ports.

The MSTI Port Configuration page has the following parameters:

• Port: The switch port number of the corresponding STP CIST (and MSTI) port
• Path Cost: Controls the path cost incurred by the port. The Auto setting sets the path cost as appropriate by the physical link speed, using the 802.1D recommended values. Using the Specific setting, a user-defined value can be entered. The path cost is used when establishing the active topology of the network. Lower path cost ports are chosen as forwarding ports in favor of higher path cost ports. Valid values are in the range of 1–200000000.
• Priority: Controls the port priority. This can be used to control priority of ports having identical port cost. Lower priority is better.