Cambium Networks PTP 820 Series User Manual page 481

Chapter 8: Ethernet Protocols
Parameter
MSTI Time Since Last TC
Viewing the MSTP VLAN Parameters
Each Ethernet service is mapped to an MSTI. By default, all services (VLAN ID) are assigned to MSTI 0 (CIST). See
Mapping Ethernet Services to MSTP instances
Note
A service mapped to MSTI 4095 is never blocked by any protocol.
To view the VLAN ID to MSTI mapping table:
1 Select Ethernet > Protocols > MSTP > Bridge > VLAN. The MSTP Bridge VLAN page opens.
Figure 269 MSTP Bridge VLAN Page
Definition
The number of centi-seconds that have elapsed since the last time the
bridge identified a topology change for a port in the MSTI.
(MSTIs).
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Configuring MSTP