Setting the spanning tree mode
The spanning tree modes include:
STP mode—All ports of the device send STP BPDUs. Select this mode when the peer device of a port supports only STP.
RSTP mode—All ports of the device send RSTP BPDUs. A port in this mode automatically transits to the STP mode when it receives STP BPDUs from the peer device. A port in this mode does not transit to the MSTP mode when it receives MSTP BPDUs from the peer device.
PVST mode—All ports of the device send PVST BPDUs. Each VLAN maintains a spanning tree. In a network, the amount of spanning trees maintained by all devices equals the number of PVST-enabled VLANs multiplied by the number of PVST-enabled ports. If the amount of spanning trees exceeds the capacity of the network, device CPUs will be overloaded. Packet forwarding is interrupted, and the network becomes unstable.
MSTP mode—All ports of the device send MSTP BPDUs. A port in this mode automatically transits to the STP mode when receiving STP BPDUs from the peer device. A port in this mode does not transit to the RSTP mode when receiving RSTP BPDUs from the peer device.
The MSTP mode is compatible with the RSTP mode, and the RSTP mode is compatible with the STP mode.
The device does not support the PVST mode.
To set the spanning tree mode:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Set the spanning tree mode. | stp mode { mstp | pvst | rstp | stp } | The default setting is the MSTP mode. |