Black Box LE2700A, User Manual, Page: 30 / 154

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Chapter 4: Redundancy
4.4.2 MSTP
Since the recovery time of STP and RSTP takes seconds, which are unacceptable in some industrial applications, MSTP was devel-
oped. The technology supports multiple spanning trees within a network by grouping and mapping multiple VLANs into different
spanning-tree instances, known as MSTIs, to form individual MST regions. Each switch is assigned to an MST region. Hence, each
MST region consists of one or more MSTP switches with the same VLANs, at least one MST instance, and the same MST region
name. Therefore, switches can use different paths in the network to effectively balance loads.
Port Settings
This page allows you to examine and change the configurations of current MSTI ports. A MSTI port is a virtual port, which is
instantiated separately for each active CIST (physical) port for each MSTI instance configured and applicable for the port. The MSTI
instance must be selected before MSTI port configuration options are displayed.
This page contains MSTI port settings for physical and aggregated ports. The aggregation settings are stack global.
Figure 4-6. MSTI Port Configuration screens.