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XMG1915 Series User’s Guide
242
CHAPTER 45
Spanning Tree Protocol
45.1 Spanning Tree Protocol Overview
The Switch supports Spanning Tree Protocol (STP), Rapid Spanning Tree Protocol (RSTP) and Multiple
Spanning Tree Protocol (MSTP) as defined in the following standards.
• IEEE 802.1D Spanning Tree Protocol
• IEEE 802.1w Rapid Spanning Tree Protocol
• IEEE 802.1s Multiple Spanning Tree Protocol
The Switch also allows you to set up multiple STP configurations (or trees). Ports can then be assigned to
the trees.
45.1.1 What You Can Do
• Use the Spanning Tree Protocol Status screen (Section 45.2 on page 244) to view the STP status in the
different STP modes (RSTP or MSTP) you can configure on the Switch.
• Use the Spanning Tree Setup screen (Section 45.3 on page 245) to activate one of the STP modes on
the Switch.
• Use the Rapid Spanning Tree Protocol Status screen (Section 45.4 on page 247) to view the RSTP status.
• Use the Rapid Spanning Tree Protocol screen (Section 45.5 on page 249) to configure RSTP settings.
• Use the Multiple Spanning Tree Protocol Status screen (Section 45.6 on page 251) to view the MSTP
status.
• Use the Multiple Spanning Tree Protocol screen (Section 45.7 on page 254) to configure MSTP.
• Use the Multiple Spanning Tree Protocol Port Setup screen (Section 45.8 on page 257) to configure
MSTP ports.
45.1.2 What You Need to Know
Read on for concepts on STP that can help you configure the screens in this chapter.
(Rapid) Spanning Tree Protocol
(R)STP detects and breaks network loops and provides backup links between switches, bridges or
routers. It allows a switch to interact with other (R)STP-compliant switches in your network to ensure that
only one path exists between any two stations on the network.
The Switch uses IEEE 802.1w RSTP (Rapid Spanning Tree Protocol) that allows faster convergence of the
spanning tree than STP (while also being backwards compatible with STP-only aware bridges). In RSTP,
topology change information is directly propagated throughout the network from the device that
generates the topology change. In STP, a longer delay is required as the device that causes a topology
change first notifies the root bridge that then notifies the network. Both RSTP and STP flush unwanted
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