Spanning Tree Protocol Configuration Guide, Cisco Catalyst IE9300 Rugged Series Switches

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Spanning Tree Protocol Configuration Guide, Cisco Catalyst IE9300 Rugged Series Switches

Spanning Tree Protocol

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This topic explains the Spanning Tree Protocol (STP), a Layer 2 link management protocol that provides path redundancy and prevents loops in Ethernet networks, ensuring network stability and proper operation.


Spanning Tree Protocol (STP) is a Layer 2 link management protocol that provides path redundancy while preventing loops in the network.

  • Ensures only one active path exists between any two stations in a Layer 2 Ethernet network.

  • Prevents network loops that can cause duplicate messages and unstable network conditions.

  • Operates transparently to end stations, which cannot detect the underlying network topology.

Path redundancy and loop prevention in Ethernet networks

STP manages redundant paths and ensures only one active path exists between any two stations to maintain a stable and loop-free Layer 2 Ethernet network.


Key functions

STP performs these essential functions.

  • Prevents loops in the network by blocking redundant paths.

  • Provides path redundancy for network reliability.

  • Automatically recalculates topology when network segments fail.

  • Operates transparently to end stations.


Supported STP modes

This topic identifies the three Spanning Tree modes supported by the switch.

The switch supports these Spanning Tree modes:

  • PVST+ (Per-VLAN Spanning Tree Plus) : Based on IEEE 802.1D standard with Cisco proprietary extensions

  • Rapid PVST+ : Based on IEEE 802.1w standard

  • MSTP (Multiple Spanning Tree Protocol) : Based on IEEE 802.1s standard