Solved

Default Spanning Tree on Cisco IOS switches

Posted on 2006-11-27
3
1,255 Views
Last Modified: 2008-01-09
Hi All

I've been searching the Cisco site for a definative answer as to what the default STP method is running on IOS switches such as the 2950 and 3550. Some people say it's PVST+, others CST.

Does anyone know, or better still, have a link to where this is answered?

Thanks
 
 
0
Comment
Question by:Dilan77
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 50

Accepted Solution

by:
Don Johnston earned 100 total points
ID: 18018653
PVST over ISL trunks and PVST+ over 802.1q trunks.

Same thing, basically.
0
 
LVL 43

Assisted Solution

by:JFrederick29
JFrederick29 earned 100 total points
ID: 18018698
I second donjohnston's comment.

Speaking from experience with these switches, it's PVST+.

Here is a portion from this "http://www.cisco.com/en/US/products/hw/switches/ps628/products_configuration_guide_chapter09186a00801a6baa.html" that confirms.  The link is for the 2950 switch but the same applies to the 3550.

Spanning-Tree Modes and Protocols

The switch supports these spanning-tree modes and protocols:

PVST+—This spanning-tree mode is based on the IEEE 802.1D standard and Cisco proprietary extensions. It is the default spanning-tree mode used on all Ethernet, Fast Ethernet, and Gigabit Ethernet port-based VLANs. The PVST+ runs on each VLAN on the switch up to the maximum supported, ensuring that each has a loop-free path through the network.
0
 
LVL 2

Author Comment

by:Dilan77
ID: 18022864
Thanks guys...
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article is a guide to configure bridging on Cisco Routers.  This is something I never knew was possible until after making a few phone calls to Cisco.  Using bridging saved our company money by not requiring us to purchase a new switch.  Bridgi…
Tired of waiting for your show or movie to load?  Are buffering issues a constant problem with your internet connection?  Check this article out to see if these simple adjustments are the solution for you.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Suggested Courses

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question