Westermo MRI-128-F4G-PSE24 - Manual (Page 74)

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4.5 Network Redundancy
The switch firmware supports standard RSTP, MSTP, Multiple Super Ring, and Rapid
Dual Homing.
Multiple Spanning Tree Protocol (MSTP) is a direct extension of RSTP. It can provide
an independent spanning tree for different VLANs. It simplifies network
management, provides for even faster convergence than RSTP by limiting the size
of each region, and prevents VLAN members from being segmented from the rest
of the group (as sometimes occurs with IEEE 802.1D STP).
Multiple Super Ring (MSR) technology supports 0 milliseconds for restore and less
than 300 milliseconds for failover.
Advanced Rapid Dual Homing (RDH) technology also facilitates the switch to
connect with a core managed switch easily and conveniently. With RDH technology,
you can also group several Rapid Super Rings or RSTP cloud together, which is also
known as Auto Ring Coupling.
Besides ring technology, the switch also supports 802.1D-2004 version Rapid
Spanning Tree Protocol (RSTP). New version of RSTP standard includes 802.1D-1998
STP, 802.1w RSTP.
Following commands are included in this section:
4.5.1
RSTP
4.5.2 RSTP Info
4.5.3 MSTP Configuration
4.5.4 MSTP Port Configuration
4.5.5 MSTP Information
4.5.6 Multiple Super Ring
4.5.7 Ring Info
4.5.8 Command Lines for Network Redundancy
4.5.1 RSTP
RSTP is the abbreviation of Rapid Spanning Tree Protocol. If a switch has more
than one path to a destination, it will lead to message loops that can generate
broadcast storms and quickly bog down a network. The spanning tree was
created to combat the negative effects of message loops in switched networks. A
spanning tree uses a spanning tree algorithm (STA) to automatically sense
whether a switch has more than one way to communicate with a node. It will
then select the best path (primary), and block the other path(s). It will also keep
track of the blocked path(s) in case the primary path fails. Spanning Tree Protocol