Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Default Spanning Tree on Cisco IOS switches

Posted on 2006-11-27
3
Medium Priority
?
1,266 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
3 Comments
 
LVL 50

Accepted Solution

by:
Don Johnston earned 400 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 400 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

[Webinar] Cloud Security

In this webinar you will learn:

-Why existing firewall and DMZ architectures are not suited for securing cloud applications
-How to make your enterprise “Cloud Ready”, and fix your aging DMZ architecture
-How to transform your enterprise and become a Cloud Enabler

Question has a verified solution.

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

It happens many times that access list (ACL) have to be applied to outgoing router interface in order to limit some traffic.This article is about how to test ACL from the router which is not very intuitive for everyone. Below scenario shows simple s…
I recently attended Cisco Live! in Las Vegas, a conference that boasted over 28,000 techies in attendance, and a week of hands-on learning hosted by a solid partner with which Concerto goes to market.  Every year, Cisco displays cutting-edge technol…
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…

885 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