?
Solved

Cisco 3750 setting speed to 100 shuts down port

Posted on 2014-02-17
6
Medium Priority
?
608 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
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
Reclaim your office - Try the MB 660 headset now!

High level of background noise often makes it difficult for employees to concentrate fully on their jobs – or to communicate clearly on calls. The MB 660 headset helps you create a disruption free workspace.  

 
LVL 12

Accepted Solution

by:
Infamus earned 2000 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

Evaluating UTMs? Here's what you need to know!

Evaluating a UTM appliance and vendor can prove to be an overwhelming exercise.  How can you make sure that you're getting the security that your organization needs without breaking the bank? Check out our UTM Buyer's Guide for more information on what you should be looking for!

Question has a verified solution.

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

How to set-up an On Demand, IPSec, Site to SIte, VPN from a Draytek Vigor Router to a Cyberoam UTM Appliance. A concise guide to the settings required on both devices
Arrow Electronics was searching for a KVM  (Keyboard/Video/Mouse) switch that could display on one single monitor the current status of all units being tested on the rack.
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…
Suggested Courses
Course of the Month12 days, 15 hours left to enroll

578 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