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Spanning tree cheat sheet version 2.0

By stretch | Monday, August 25, 2008 at 2:03 a.m. UTC

The old spanning tree cheat sheet had numerous problems (as dutifully pointed out by a number of readers), so I decided to rework it from scratch. Today I've uploaded the new STP cheat sheet, version 2.0.

The new sheet is two pages, expanded to include full IOS configuration examples of both PVST+ and MST. Through some amount of pain, I've also managed to draw up a specifications flow chart, illustrating the development of the various spanning tree protocols over the past decade or so. I felt this was important, as many people still refer to RSTP as 802.1w and MST as 802.1s, when in fact those supplements have been merged into the finalized 802.1D and 802.1Q standards, respectfully. It's also interesting to see how Cisco has developed their proprietary per-VLAN implementations in parallel to the open standards.

As always, feel free to download and distribute freely, and please let me know if you uncover any errors.

Posted in Announcements


August 25, 2008 at 3:10 a.m. UTC

nice nice - this was needed !

August 25, 2008 at 5:46 a.m. UTC

note: rapid pvst+ is usualy called "pvrst+" than "rpvst+"

August 25, 2008 at 1:21 p.m. UTC

The specifications flow chart is awesome. That clears up a very confusing topic

August 25, 2008 at 1:41 p.m. UTC

Awesome work man, I appreciate it. I always get confused with the whole STP process.. this will definitely help out with studying!


August 25, 2008 at 1:44 p.m. UTC


RPVST+ (also known as PVRST+)...

August 25, 2008 at 2:32 p.m. UTC

Nice !!

Ryan Helton
August 25, 2008 at 2:49 p.m. UTC

This is great man! My favorite one yet and just in time for my ICND2 cramming. Thanks!

August 25, 2008 at 4:06 p.m. UTC

way to go stretch, this always helps

August 25, 2008 at 4:28 p.m. UTC

Excellent as usual!

August 27, 2008 at 6:52 p.m. UTC

Thanks for the work! These are absolutely fantastic, as usual!

Per Google: 616 for rpvst. 2,850 for pvrst.

There wasn't enough aggregate info to get trends :-(

August 27, 2008 at 8:50 p.m. UTC

Very nice writeup.

Syed Asif Raza
August 28, 2008 at 4:49 a.m. UTC

Mavellous bro!! Excellent work once again....

August 29, 2008 at 8:57 p.m. UTC

"many people still refer to RSTP as 802.1w and MST as 802.1s, when in fact those supplements have been merged into the finalized 802.1D and 802.1Q standards, respectfully." Thanks for this but the reason everyone thinks this is that the Ciscopress books give out the wrong information which is very annoying.

December 2, 2014 at 3:41 a.m. UTC

Thank you for doing what the books and training courses don't.

A guest
May 28, 2016 at 8:14 a.m. UTC

Thank you very much!!

Randy Mukti
July 11, 2016 at 8:09 a.m. UTC

Nice Posting, Thanks

But maybe you could review new technology of STP. Its called as Per-VLAN Spanning-Tree Access Gateway (PVSTAG). I still dont understand in here.


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