Juniper EX9200 Features Manual page 239

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Copyright © 2017, Juniper Networks, Inc.
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
(Bpdu Incon)
ge-0/0/6 128:519
(Bpdu Incon)
ge-0/0/7 128:520
ge-0/0/8 128:521
[output truncated]
When BPDUs are sent from the PCs to interface
Switch 2, the output from the operational mode command
shows that the interfaces have transitioned to a BPDU inconsistent state. The BPDU
inconsistent state causes the interfaces to shut down.
Disabling the BPDU protection configuration on an interface does not automatically
reenable the interface. However, if the
been included in the BPDU configuration, the interface does return to service after the
timer expires. Otherwise, you must use the operational mode command
to unblock and reenable the interface.
If the PCs connected to Switch 2 send BPDUs to the interfaces again, BPDU protection
is triggered once more and the interfaces transition back to the BPDU inconsistent state,
causing them to shut down. In such cases, you need to find and repair the misconfiguration
on the PCs that is sending BPDUs to Switch 2.
Release Description
15.1 Starting with Junos OS Release 15.1 for EX Series and QFX Series switches with
support for the Enhanced Layer 2 Software (ELS) configuration style, you can
also configure BPDU protection globally on all spanning tree interfaces.
Example: Faster Convergence and Improved Network Stability with RSTP on EX Series
Switches
Example: Configuring BPDU Protection on Interfaces to Prevent STP Miscalculations on
EX Series Switches
Example: Configuring Loop Protection to Prevent Interfaces from Transitioning from
Blocking to Forwarding in a Spanning Tree on EX Series Switches
Chapter 10: Using BPDU Protection, Root Protection, and Loop Protection
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
128:1 16384.00aabbcc0348
128:521 32768.0019e2503f00
ge-0/0/5
disable-timeout (Spanning Trees)
Port State Role
Cost
20000 BLK DIS
20000 BLK DIS
20000 BLK DIS
20000 FWD DESG
20000 FWD DESG
20000 BLK DIS
20000 BLK DIS
20000 FWD ROOT
20000 FWD DESG
and interface on
ge-0/0/6
show spanning-tree interface
statement has
clear error bpdu
223