Solved

Cisco 3750 setting speed to 100 shuts down port

Posted on 2014-02-17
6
570 Views
Last Modified: 2014-02-17
Hi everyone,  I have what I believe to be an interesting situation.  I have a 3750 switch that I'm trying to hard set the speed to 100 on a port that I have a Cisco C20 VTC endpoint connected to.  The IOS I'm running on the switch is 12.2 (55) SE8.  Whenever I enter the command "speed 100", it shuts down the port.  If I set the speed to "auto", it will bring it up but only to 10mb.  I don't have port security set and the config is as basic as it gets.

switchport access vlan 15
switchport mode access
speed 100
duplex full

Thoughts anyone?
0
Comment
Question by:hackman122
[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
6 Comments
 
LVL 8

Expert Comment

by:Jeff Perry
ID: 39865730
What is the port on the C20 VTC set to? Is there anyway to adjust them (I am not familiar with this device).
0
 
LVL 25

Expert Comment

by:Ken Boone
ID: 39865737
It sounds like the VTC is operation at 10Mb  - so it auto negotiates the speed to 10 and comes up.  When you set it to 100 either 1) the VTC only operates at 10 so it doesn't see the link or 2) the VTC is hardcoded to 10Mb so it doesn't see the link or 3) the VTC doesn't auto negotiate very well.

Actually just looked at the specs - it is supposed to do 10/100/1000 so you will need to look at the etehrnet configuration on that and see if it is currently hard coded.
0
 

Author Comment

by:hackman122
ID: 39866145
Recommendations are to hard set the speed on the C20 to 100 full.  If I do the same on the switch, I can hard set the duplex to full but when I set the speed to 100, that's when it craps out on me.  If they are both set to auto negotiate, it will do 10 half.
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 12

Accepted Solution

by:
Infamus earned 500 total points
ID: 39866328
Try rebooting C20 after changing the speed to manual 100/full.
0
 

Author Closing Comment

by:hackman122
ID: 39866366
It's always the simplest things.  I hard set the speed on the C20 then restarted it.  Then I hard set the speed on the switch to 100.  That seemed to do the trick.  Thanks for the help.
0
 
LVL 12

Expert Comment

by:Infamus
ID: 39866376
Glad it worked!
0

Featured Post

Forrester Webinar: xMatters Delivers 261% ROI

Guest speaker Dean Davison, Forrester Principal Consultant, explains how a Fortune 500 communication company using xMatters found these results: Achieved a 261% ROI, Experienced $753,280 in net present value benefits over 3 years and Reduced MTTR by 91% for tier 1 incidents.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Building small business network 4 119
Network Devices Audit Log 2 46
Can you use inline network testing tools with Cisco port security? 2 49
Monitoring solutions 8 108
Every server (virtual or physical) needs a console: and the console can be provided through hardware directly connected, software for remote connections, local connections, through a KVM, etc. This document explains the different types of consol…
As companies replace their old PBX phone systems with Unified IP Communications, many are finding out that legacy applications such as fax do not work well with VoIP. Fortunately, Cloud Faxing provides a cost-effective alternative that works over an…
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…
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…

737 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