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

x
?
Solved

configuration problem in 3com switches in a mixed 3com and cisco switches environment

Posted on 2004-09-11
2
Medium Priority
?
492 Views
Last Modified: 2008-01-09
When I did a network discovery on a subnet using 3com network supervisor (version 4), a misconfiguration report was generated stating one of the port must enable for spanning tree protocol for a connection with a workstation.

On clicking a link for further information, it stated that there was a 'fast start' problem.

The problem port is unit 3 port 26 on a '3-stacked 3com switches 4226' connnected to a cisco 3550 switch through trunking 802.1q.
0
Comment
Question by:thtan56
2 Comments
 
LVL 1

Accepted Solution

by:
SteveDavis earned 1500 total points
ID: 12036481
When you connect a device (PC, Printer, etc) to a Port on a Switch, the Switch goes through a series of steps such as Listening, Learning, Blocking, and Forwarding.  When you adjust the spantree setting to PortFast, you are instructing to Switch to skip some of these steps to increase the speed of connectivity to that port.  However, you need to use care in deciding which ports to enable these changes to prevent a Spanning Tree Loop.  Usually, with PC's and Printers you are safe, but use extra caution when connecting Switches and Routers to these ports.

Another thing to consider, ensure that your ports are hard coded for 100 MB and FULL Duplex as this may cause the problem you described.  On the cisco 3500, type config t to enter Global Configuration Mode, then type interface Fa/## where ## is the port number on the Cisco 3500.  Next type 'spanning-tree portfast' to enable portfast on that port.  On the 3Com Switch, you should be able to enable portfast by clicking on the graphical selections using your browser.

Best of Luck
Steve
0
 

Author Comment

by:thtan56
ID: 12055322
unit 3 port 26 is a port on the stack of 3com switches (3 stacked together).
I don't think any change is needed on the cisco as the problem pointed to 3com switches.

At one stage, I disconnected the cable on that port where a pc running windows os.
However the same misconfiguration report was regenerate.

I tried Steve's suggestion by enabling the port using the brower.
I tried the network discovery and the same report was generated.
0

Featured Post

2017 Webroot Threat Report

MSPs: Get the facts you need to protect your clients.
The 2017 Webroot Threat Report provides a uniquely insightful global view into the analysis and discoveries made by the Webroot® Threat Intelligence Platform to provide insights on key trends and risks as seen by our users.

Question has a verified solution.

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

I had an issue with InstallShield not being able to use Computer Browser service on Windows Server 2012. Here is the solution I found.
Make the most of your online learning experience.
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…

877 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