Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1910

Complete Software Guide for Junos
Meaning
Purpose
Action
Meaning
Related
Documentation
1806
®
OS for EX Series Ethernet Switches, Release 10.4
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
ge-0/0/6.0 128:519
[output truncated]
The output from the operational mode command
that is the alternate port and in a blocking state.
ge-0/0/6.0
Verifying That Loop Protection Is Working on an Interface
Verify the loop protection configuration on interface
on interface ge-0/0/4 on Switch 1. This will stop BPDUs from being sent to interface
and trigger loop protection on the interface.
ge-0/0/6
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
ge-0/0/6.0 128:519
(Loop-Incon)
[output truncated]
The operational mode command
has detected that BPDUs are no longer being forwarded to it and has moved
ge-0/0/6.0
into a loop-inconsistent state. The loop-inconsistent state prevents the interface from
transitioning to a forwarding state. The interface recovers and transitions back to its
original state as soon as it receives BPDUs.
Example: Configuring Faster Convergence and Improving Network Stability with RSTP
on EX Series Switches on page 1761
Example: Configuring Root Protection to Enforce Root Bridge Placement in Spanning
Trees on EX Series Switches on page 1807
Example: Configuring BPDU Protection on STP Interfaces to Prevent STP
Miscalculations on EX Series Switches on page 1795
Example: Configuring BPDU Protection on non-STP Interfaces to Prevent STP
Miscalculations on EX Series Switches on page 1799
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
128:2 16384.00aabbcc0348
show spanning-tree interface
ge-0/0/6
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
Cost
20000 BLK
20000 BLK
20000 BLK
20000 FWD
20000 FWD
20000 FWD
20000 BLK
shows
. RSTP has been disabled
Port State
Cost
20000 BLK
20000 BLK
20000 BLK
20000 FWD
20000 FWD
20000 FWD
20000 BLK
shows that interface
Copyright © 2010, Juniper Networks, Inc.
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