Westermo PMI-110-F2G - Manual (Page 68)

4.5 Network Redundancy
It is critical for industrial applications that network remains non‐stop. PMI Switch
supports standard RSTP, Multiple Super Ring, Rapid Dual Homing and backward
compatible with Legacy Super Ring Client modes.
Multiple Super Ring (MSR) technology, 0 ms for restore and about 5 milliseconds
for failover for copper.
Advanced Rapid Dual Homing (RDH) technology also facilitates PMI Switch to
connect with a core managed switch easily and conveniently. With RDH
technology, you can also couple several Rapid Super Rings or RSTP cloud together,
which is also known as Auto Ring Coupling.
To become backwards compatible with the Legacy Super Ring technology
implemented in PMI switches, PMI Switch also supports Super Ring Client mode.
The Super Ring ports can pass through Super Ring control packets extremely well
and works with Super Ring.
Besides ring technology, all PMI Managed Switch support 802.1D‐2004 version
Rapid Spanning Tree Protocol (RSTP). New version of RSTP standard includes
802.1D‐1998 STP, 802.1w RSTP, IEEE 802.1s MSTP (Multiple Spanning Tree). The
MSTP function is available from 1.1 version firmwear.
Following commands are included in this group:
4.5.1 STP configuration
4.5.2 STP Port configuration
4.5.3 STP information
4.5.4 MSTP configuration
4.5.5 MSTP Port Configuration
4.5.6 MSTP information
4.5.7 Multiple Super Ring
4.5.8 Multiple Super Ring Info
4.5.9 Command Lines for Network Redundancy
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