Juniper EX9200 Features Manual page 253

Purpose
Action
Meaning
Purpose
Copyright © 2017, Juniper Networks, Inc.
Displaying the Interface State Before Loop Protection Is Triggered
Before loop protection is triggered on interface
blocking.
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
ge-0/0/6 128:519
[output truncated]
The output from the operational mode command
that ge-0/0/6 is the alternate port and in a blocking state.
Verifying That Loop Protection Is Working on an Interface
Verify the loop protection configuration on interface
on interface on Switch 1. This will stop BPDUs from being sent to interface
ge-0/0/4
and trigger loop protection on the interface.
ge-0/0/6
Chapter 10: Using BPDU Protection, Root Protection, and Loop Protection
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
128:2 16384.00aabbcc0348
show spanning-tree interface
ge-0/0/6
, confirm that the interface is
Port State Role
Cost
20000 BLK DIS
20000 BLK DIS
20000 BLK DIS
20000 FWD DESG
20000 FWD DESG
20000 FWD DESG
20000 BLK ALT
shows
. RSTP has been disabled
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