XGS2220 Series User’s Guide
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CHAPTER 53
Spanning Tree Protocol
53.1 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.
53.1.1 What You Can Do
• Use the Spanning Tree Protocol Status screen (Section 53.2 on page 341) to view the STP status in the
different STP modes (RSTP, MRSTP or MSTP) you can configure on the Switch.
• Use the Spanning Tree Setup screen (Section 53.3 on page 341) to activate one of the STP modes on
the Switch.
• Use the Rapid Spanning Tree Protocol Status screen (Section 53.4 on page 344) to view the RSTP status.
• Use the Rapid Spanning Tree Protocol screen (Section 53.5 on page 346) to configure RSTP settings.
• Use the Multiple Rapid Spanning Tree Protocol Status screen (Section 53.6 on page 348) to view the
MRSTP status.
• Use the Multiple Rapid Spanning Tree Protocol screen (Section 53.7 on page 350) to configure MRSTP.
• Use the Multiple Spanning Tree Protocol Status screen (Section 53.8 on page 353) to view the MSTP
status.
• Use the Multiple Spanning Tree Protocol screen (Section 53.9 on page 355) to configure MSTP.
• Use the Multiple Spanning Tree Protocol Port Setup screen (Section 53.10 on page 358) to configure
MSTP ports.
53.1.2 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
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