Juniper EX9200 Features Manual page 258

Spanning-Tree Protocols Feature Guide for EX9200 Switches
Purpose
Action
Meaning
Purpose
242
Displaying the Interface State Before Root Protection Is Triggered
Before root protection is triggered on interface
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
ge-0/0/7 128:520
[output truncated]
The output from the operational mode command
that is a designated port in a forwarding state.
ge-0/0/7
Verifying That Root Protection Is Working on the Interface
A configuration change takes place on Switch 4. A smaller bridge priority on the Switch
4 causes it to send superior BPDUs to interface
interface will trigger root protection. Verify that root protection is operating on
ge-0/0/7
interface .
ge-0/0/7
ge-0/0/7
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
128:2 16384.00aabbcc0348
128:1 16384.00aabbcc0348
128:520 32768.0019e2503f00
show spanning-tree interface
ge-0/0/7
, confirm the interface state.
Port State
Cost
20000 BLK DIS
20000 BLK DIS
20000 BLK DIS
20000 FWD DESG
20000 FWD DESG
20000 BLK ALT
20000 FWD ROOT
20000 FWD DESG
shows
. Receipt of superior BPDUs on
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