Using Bpdu Protection, Root Protection, And Loop Protection; Understanding Bpdu Protection For Stp, Rstp, And Mstp On Ex Series Switches - Juniper EX9200 Features Manual

CHAPTER 10
Using BPDU Protection, Root Protection,
and Loop Protection

Understanding BPDU Protection for STP, RSTP, and MSTP on EX Series Switches

Copyright © 2017, Juniper Networks, Inc.
Understanding BPDU Protection for STP, RSTP, and MSTP on EX Series
Switches on page 217
Example: Configuring BPDU Protection on Edge Interfaces to Prevent STP
Miscalculations on page 219
Example: Configuring BPDU Protection on Interfaces to Prevent STP Miscalculations
on EX Series Switches on page 224
Configuring BPDU Protection on Spanning Tree Interfaces on page 230
Unblocking an Interface That Receives BPDUs in Error (CLI Procedure) on page 231
Understanding Loop Protection for STP, RSTP, VSTP, and MSTP on EX Series
Switches on page 231
Understanding Root Protection for STP, RSTP, VSTP, and MSTP on EX Series
Switches on page 233
Example: Configuring Loop Protection to Prevent Interfaces from Transitioning from
Blocking to Forwarding in a Spanning Tree on EX Series Switches on page 234
Example: Configuring Root Protection to Enforce Root Bridge Placement in Spanning
Trees on EX Series Switches on page 238
Networks frequently use multiple protocols simultaneously to achieve different goals
and in some cases those protocols might conflict with each other. One such case is when
spanning-tree protocols are active on the network, where a special type of switching
frame called a bridge protocol data unit (BPDU) can conflict with BPDUs generated on
other devices such as PCs. The different kinds of BPDUs are not compatible, but they
can still be recognized by other devices that use BPDUs and cause network outages. You
need to protect any device that recognizes BPDUs from picking up incompatible BPDUs.
Different Kinds of BPDUs on page 218
Protecting Switches from Incompatible BPDUs on page 218
217