Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1902

Complete Software Guide for Junos
Purpose
Action
Meaning
Related
Documentation
1798
®
OS for EX Series Ethernet Switches, Release 10.4
Verifying That BPDU Protection is Working Correctly
In this example, the PCs connected to Switch 2 start sending BPDUs to interface
ge-0/0/5.0 and interface
interfaces.
Use the operational mode command:
user@switch> show spanning-tree interface
Spanning tree interface parameters for instance 0
Interface Port ID
ge-0/0/0.0 128:513
ge-0/0/1.0 128:514
ge-0/0/2.0 128:515
ge-0/0/3.0 128:516
ge-0/0/4.0 128:517
ge-0/0/5.0 128:518
(Bpdu—Incon)
ge-0/0/6.0 128:519
(Bpdu—Incon)
ge-0/0/7.0 128:520
ge-0/0/8.0 128:521
[output truncated]
When BPDUs are sent from the PCs to interface
on Switch 2, the output from the operational mode command
shows that the interfaces have transitioned to a BPDU inconsistent state. The BPDU
inconsistent state makes the interfaces block and prevents them from forwarding traffic.
Disabling the BPDU protection configuration on an interface does not unblock the
interface. If the
disable-timeout
the interface automatically returns to service after the timer expires. Otherwise, use the
operational mode command
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.
In such cases, you need to find and repair the misconfiguration on the PCs that is triggering
BPDUs being sent to Switch 2.
Example: Configuring Faster Convergence and Improving Network Stability with RSTP
on EX Series Switches on page 1761
Example: Configuring BPDU Protection on non-STP Interfaces to Prevent STP
Miscalculations on EX Series Switches on page 1799
Example: Configuring Loop Protection to Prevent Interfaces from Transitioning from
Blocking to Forwarding in a Spanning Tree on EX Series Switches on page 1803
Example: Configuring Root Protection to Enforce Root Bridge Placement in Spanning
Trees on EX Series Switches on page 1807
ge-0/0/6.0 . Verify that BPDU protection is configured on the
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-0/0/5.0
statement has been included in the BPDU configuration,
clear ethernet-switching bpdu-error
Port State
Cost
20000 BLK
20000 BLK
20000 BLK
20000 FWD
20000 FWD
20000 BLK
20000 BLK
20000 FWD
20000 FWD
and interface
ge-0/0/6.0
show spanning-tree interface
to unblock the interface.
Copyright © 2010, Juniper Networks, Inc.
Role
DIS
DIS
DIS
DESG
DESG
DIS
DIS
ROOT
DESG