Solved

Cisco 3750 - two ports stopped passing traffic

Posted on 2013-01-28
2
812 Views
Last Modified: 2013-01-28
I have a 3750 switch - two member stack - that has been up for four years.  It runs C3750-ADVIPSERVICESK9-M, Version 12.2(46)SE.  It's run flawlessly until the last few weeks.  Interface Gi1/0/6 stopped sending/receiving traffic although it was in up/up mode.  I tried to admin down/up the int but no good.  So I moved the cable to another interface (say 1/30) and the traffic flowed again.  Over the weekend interface Gi1/0/5 had the same symptom.  The host connected to it - a Cisco UCM stopped responding to ping or anything else although the port was up/up.  There were no errors visible when I tried "show log" and no incrementing errors on the interface, nothing in syslog.  I could even see the bps in and out appear to show some traffic.  But from a ping or TCP standpoint the interface was passing no traffic.  I bounced the UCM and still no traffic flowed.  I moved the cable to interface Gi 1/0/15 and now traffic was flowing again.  

I wanted to get some thoughts on here before opening a TAC case.  Does this sound like a memory leak bug with this version of IOS?  A failing ASIC?  Other thoughts on troubleshooting or possible explanation?  Thank you.
0
Comment
Question by:amigan_99
[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
2 Comments
 
LVL 20

Accepted Solution

by:
rauenpc earned 500 total points
ID: 38827443
When traffic stops flowing, can you get any other device to communicate on those ports? Is any type of port security, storm control, dot1x, or any other method applied to the ports that could automatically disable a port?

Assuming that no security/error method (or spanning-tree) is blocking traffic, it does sound like an ASIC that is on the fritz. Perhaps a switch reboot is an order, and/or a TAC case. If you have smartnet, I would definitely start a TAC case immediately even if it's just a CYA. Grab a "show tech" when the issue is occurring for TAC to review.
0
 
LVL 1

Author Closing Comment

by:amigan_99
ID: 38827458
The ports did not go to disabled mode and there is not dot1x in my entire environment.  But that's a great point.  I have not tried attaching another device - that's an good thought.  I think you are right tho - time to spin up TAC.
0

Featured Post

Flexible connectivity for any environment

The KE6900 series can extend and deploy computers with high definition displays across multiple stations in a variety of applications that suit any environment. Expand computer use to stations across multiple rooms with dynamic access.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Non Distrubtive Core Switch Repacement 8 42
802.1x and RDP Issues 6 109
Network Bandwidth Monitoring tool for Virtual Offices 10 125
Retrieve a Registry value using SCCM 2012. 2 45
Outsource Your Fax Infrastructure to the Cloud (And come out looking like an IT Hero!) Relative to the many demands on today’s IT teams, spending capital, time and resources to maintain physical fax servers and infrastructure is not a high priority.
Data center, now-a-days, is referred as the home of all the advanced technologies. In-fact, most of the businesses are now establishing their entire organizational structure around the IT capabilities.
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

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