Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1906

Complete Software Guide for Junos
Meaning
Purpose
Action
Meaning
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1802
®
OS for EX Series Ethernet Switches, Release 10.4
ge-0/0/4.0 up v1
ge-0/0/5.0 up v1
ge-0/0/6.0 up default
[output truncated]
The output from the operational mode command
shows 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 ethernet-switching interfaces
Interface State VLAN members
ge-0/0/0.0 up default
ge-0/0/1.0 up default
ge-0/0/2.0 up default
ge-0/0/3.0 up default
ge-0/0/4.0 up v1
ge-0/0/5.0 down v1
ge-0/0/6.0 down default
[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 shut down 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
error condition and restore the interface to service.
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 STP Interfaces to Prevent STP
Miscalculations on EX Series Switches on page 1795
Example: Configuring Loop Protection to Prevent Interfaces from Transitioning from
Blocking to Forwarding in a Spanning Tree on EX Series Switches on page 1803
unblocked
unblocked
unblocked
show ethernet-switching interfaces
are
ge-0/0/6.0
. Verify that BPDU protection is configured on the
ge-0/0/6.0
Blocking
unblocked
unblocked
unblocked
unblocked
unblocked
blocked - blocked by bpdu-control
blocked - blocked by bpdu-control
ge-0/0/5.0
statement has been included in the BPDU configuration,
clear ethernet-switching bpdu-error
and unblocked.
up
and interface
ge-0/0/6.0
show spanning-tree interface
to recover from the
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