This is a Juniper SLAX op script to provide a quick STP topology breakdown.
This script will combine and shorten the output of the show spanning-tree bridge,
show spanning-tree interface, and show spanning-tree mstp configuration
commands into one easy to read format. You can determine
if the local switch is root, what the root priority and root MAC address are, why the local
switch is not root, and what interface is the root port if it isn't root. If in a VSTP
or MSTP scenario, it will also print associated VLANs for each MSTI. For MSTP configurations, it will
also output the Configuration Name, Revision Level, and Configuration Digest.
For detailed information for storing and enabling an op script on your Junos device, please visit this page
General SLAX Overview
Junos Automation Documentation
RSTP Example:
> op stp
-------------------------------------------------------------
Region Rt Priority Root MAC Root? Why Not?
RSTP 8192 40:b4:f0:6a:dc:01 No Your priority: 32768
Root port: ge-0/0/47.0
MSTP Example
> op stp
-------------------------------------------------------------
Region Rt Priority Root MAC Root? Why Not?
CIST 8192 00:19:e2:51:83:c1 No Your priority: 32768
Root port: ge-0/0/12.0
VLANS: 0-264, 267-269, 271-1300, 1303-1330, 1333-4094
-------------------------------------------------------------
Configuration Name Revision Level Configuration Digest
Test-MSTP 1 0x2adca6e344946ceedde262329c949bb0
-------------------------------------------------------------
Region Rt Priority Root MAC Root? Why Not?
MSTI 1 32769 00:19:e2:51:85:c1 No Root has lower MAC.
VLANS: 1301-1302 Root port: ge-0/0/12.0
-------------------------------------------------------------
Region Rt Priority Root MAC Root? Why Not?
MSTI 2 32770 3c:8a:b0:9b:fc:81 Yes N/A
No active interfaces on any VLANs in this MSTI.
VLANS: 1331-1332
-------------------------------------------------------------
Region Rt Priority Root MAC Root? Why Not?
MSTI 3 32771 00:19:e2:51:85:c1 No Root has lower MAC.
VLANS: 265-266, 270 Root port: ge-0/0/12.0
VSTP Example
> op stp
VSTP Instances:
VSTP VLAN Rt Priority Root MAC Root? Why Not?
Vlan 10 32778 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 11 32779 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 12 32780 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 13 32781 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 1301 34069 00:19:e2:51:85:c1 No Root has lower MAC.
Root port: ge-0/0/12.0
Vlan 1331 34099 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 14 32782 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 15 32783 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 16 32784 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 17 32785 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 18 32786 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 21 32789 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 23 32791 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 24 32792 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 258 33026 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 265 33033 00:19:e2:51:85:c1 No Root has lower MAC.
Root port: ge-0/0/12.0
Vlan 400 33168 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 500 33268 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 620 33388 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 621 33389 3c:8a:b0:9b:fc:81 Yes N/A
Vlan 666 33434 3c:8a:b0:9b:fc:81 Yes N/A
- v1.0
- Inital Release
- v1.1
- Modified template rootport-vlans to not display the 'VLANS' line when RSTP is running, since it should be obvious that all vlans are encompassed by RSTP.
- Also changed how ouput is handled to remove output-line template, which made code more readable.
- v1.2
- Changed invoking of the commands to be one open connection to the RE, to improve callback time.
- Also made some changes to comments.
- v1.3
- Added blank lines between MSTI regions for readability.
- Modified the output of the VLAN list. If it is greater than 35 characters, it shows up one line below, so that the Root Port information doesn't get shifted right.
- Added output for the MSTP Configuration Name, Revision Level, and Configuration Digest.
- Fixed the logic for MSTP instances. There was an error so that the first MSTI was being used as the results for all MSTI instances.
- Updated the Readme with instructions on using the SLAX script.
- Modified output to be shown to the user as it is generated, rather than all at once upon script completion. This should create quicker results for large numbers of MSTIs, so the user knows that the script is actively working.
- v1.3.1
- Rootport-vlans template will now let the user know if there are no interfaces active in a given MSTI.
- Rootport-vlans template will also now output the VLAN info for MSTIs where no VLANS in the MSTI have active interfaces.
- VLAN info will now also be omitted when the protocol is STP, was previously only omitting for RSTP.
- VSTP logic fix, had the same problem as MSTP in v1.3
- Made the VLAN list output easier to read by injecting a space after each comma.
- Updated example output inside the script, and within the Readme file.