Using Rstp; Understanding Rstp For Ex Series And Qfx Series Switches; Chapter 1 Using Rstp - Juniper EX9200 Features Manual

CHAPTER 1

Using RSTP

Understanding RSTP for EX Series and QFX Series Switches

Copyright © 2017, Juniper Networks, Inc.
Understanding RSTP for EX Series and QFX Series Switches on page 3
RSTP or VSTP Forced to Run as IEEE 802.1D STP on page 8
Configuring a Spanning-Tree Instance Interface as an Edge Port for Faster
Convergence on page 8
Example: Configuring Faster Convergence and Improved Network Stability with
RSTP on page 9
Forcing RSTP or VSTP to Run as IEEE 802.1D STP (CLI Procedure) on page 27
Configuring Spanning Tree Protocols (J-Web Procedure) on page 28
Configuring RSTP (CLI Procedure) on page 33
Reverting to RSTP or VSTP from Forced IEEE 802.1D STP on page 34
Ethernet networks are susceptible to broadcast storms if loops are introduced. However,
an Ethernet network needs to include loops because they provide redundant paths in
case of a link failure. Spanning-tree protocols address both of these issues because they
provide link redundancy while simultaneously preventing undesirable loops. Rapid
Spanning Tree Protocol (RSTP) is the default spanning-tree protocol for preventing
loops on Ethernet networks.
This topic describes:
Spanning Tree Protocols Help Prevent Broadcast Storms on page 4
RSTP is an Enhancement of the Original STP on page 4
Port Roles Determine Participation in the Spanning Tree on page 4
Port States Determine How a Port Processes a Frame on page 5
Edge Ports Connect to Devices That Cannot Be Part of a Spanning Tree on page 5
BPDUs Maintain the Spanning-Tree on page 5
When an RSTP Root Bridge Fails on page 6
Switches Must Relearn MAC Addresses After a Link Failure on page 6
Selecting a Spanning Tree Protocol on page 6
3