Example: Configuring Root Protection To Enforce Root Bridge Placement In Spanning Trees On Ex Series Switches - Juniper EX9200 Features Manual

Spanning-Tree Protocols Feature Guide for EX9200 Switches
Action
Meaning
Related
Documentation
Example: Configuring Root Protection to Enforce Root Bridge Placement in Spanning
Trees on EX Series Switches
238
Use the operational mode command:
user@switch> show spanning-tree interface
Spanning tree interface parameters for instance 0
Interface Port ID
ge-0/0/0 128:513
ge-0/0/1 128:514
ge-0/0/2 128:515
ge-0/0/3 128:516
ge-0/0/4 128:517
ge-0/0/5 128:518
ge-0/0/6 128:519
(Loop-Incon)
[output truncated]
The operational mode command
has detected that BPDUs are no longer being forwarded to it and has moved
ge-0/0/6
into a loop-inconsistent state. The loop-inconsistent state prevents the interface from
transitioning to a forwarding state. To clear the BPDU error, issue the operational mode
command
clear error bpdu interface
back to its original state as soon as it receives BPDUs.
Example: Configuring Faster Convergence and Improved Network Stability with RSTP
on page 9
Understanding Loop Protection for STP, RSTP, VSTP, and MSTP on EX Series Switches
on page 231
NOTE: This example uses Junos OS for EX Series switches with support for
the Enhanced Layer 2 Software (ELS) configuration style. If your switch runs
software that does not support ELS, see Example: Configuring Root Protection
to Enforce Root Bridge Placement in Spanning Trees on EX Series Switches .
For ELS details, see Getting Started with Enhanced Layer 2 Software.
EX Series switches provide Layer 2 loop prevention through Spanning Tree Protocol
(STP), Rapid Spanning Tree protocol (RSTP), and Multiple Spanning Tree Protocol
(MSTP). Root protection increases the efficiency of STP, RSTP, and MSTP by allowing
network administrators to manually enforce the root bridge placement in the network.
Designated Designated
port ID bridge ID
128:513 32768.0019e2503f00
128:514 32768.0019e2503f00
128:515 32768.0019e2503f00
128:516 32768.0019e2503f00
128:517 32768.0019e2503f00
128:518 32768.0019e2503f00
128:519 32768.0019e2503f00
show spanning-tree interface
on the switch. The interface recovers and transitions
Port State
Cost
20000 BLK DIS
20000 BLK DIS
20000 BLK DIS
20000 FWD DESG
20000 FWD DESG
20000 FWD DESG
20000 BLK DIS
shows that interface
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