Rapid Spanning Tree Protocol (RSTP) is an OSI layer 2 protocol defined by IEEE 802.1D 2004 that performs the following functions:
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it creates a loop-free logical network path for Ethernet devices that are part of a topology that includes redundant physical paths
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it automatically restores network communication—by activating redundant links—in the event the network experiences a broken link
RSTP software, operating simultaneously in every network switch, obtains information from each switch which enables the software to create a hierarchical logical network topology. RSTP is a flexible protocol that can be implemented on many physical topologies, including ring, mesh, or a combination of ring and mesh.
Schneider Electric recommends the following practices:
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Use RSTP instead of STP: RSTP provides a faster recovery time than STP
NOTE: Recovery time is the time that elapses between the moment a broken link is detected to the moment network service is restored. Recovery time depends on:
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the number of switches in the topology: the more switches, the longer the recovery time
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the processing speed of the switches in the topology: the slower the speed, the longer the recovery time
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the bandwidth, traffic load, and topology pattern
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If the switch is part of a topology with redundant physical paths: enable RSTP.
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If the switch is part of a topology that does not include redundant physical paths: disable RSTP—in this case, disabling RSTP improves network performance.
