Juniper JUNOS OS 10.3 - SOFTWARE Manual page 1660

For ex series ethernet switches
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1564
®
OS for EX Series Ethernet Switches, Release 10.3
ge-0/0/6.0
128:519
[output truncated]
The output from the operational mode command
that
and interface
ge-0/0/5.0
Verifying That BPDU Protection is Working Correctly
In this example, the PCs connected to Switch 2 start sending BPDUs to interface
and interface
ge-0/0/5.0
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
interface
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 1527
Example: Configuring BPDU Protection on non-STP Interfaces to Prevent STP
Miscalculations on EX Series Switches on page 1565
128:519
32768.0019e2503f00
show spanning-tree interface
are designated ports in a forwarding state.
ge-0/0/6.0
. Verify that BPDU protection is configured on the
ge-0/0/6.0
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
20000
FWD
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
to unblock the interface.
Copyright © 2010, Juniper Networks, Inc.
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