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whole network loss the connection

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whole network loss the connection

Postby blin » Tue Jan 31, 2017 10:49 am

Q: Around 12:50 AM, the whole network lost the conenction. Most PING IP ADDRESS gets timeout. Some ping may get one or two replies, then timeout. We have tried to ping the ip of router, firewall, servers and workskations. All gets timeout. We didn't make anychange except installing some windows update in some of servers last night. Restarting the two DC doesn't fix the problem. Every thing comes back normal after one hour.

A: I remember seeing similar problems in different companies. In one case, it is defected wifi router. In other case, is a bad small switch. Troubleshooting takes many hours to locate the problematic device by disconnecting one switch by another switch.
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blin
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Re: whole network loss the connection

Postby blin » Tue Jan 31, 2017 10:52 am

It could be routing loop. Check for route flapping, start unplugging to isolate. Especially pay attention to some old and unmanageable switch.
How to Configure and Troubleshoot Cisco
http://www.howtocisco.com

Tablet and Smartphone Setup Guide
http://www.quicksetupguide.com
blin
Site Admin
 
Posts: 3643
Joined: Wed Dec 31, 1969 7:00 pm
Location: Chicago, USA

Re: whole network loss the connection

Postby blin » Tue Jan 31, 2017 10:53 am

in one case, rebooting DC and wait for 10 minutes, that fixes the problem.
How to Configure and Troubleshoot Cisco
http://www.howtocisco.com

Tablet and Smartphone Setup Guide
http://www.quicksetupguide.com
blin
Site Admin
 
Posts: 3643
Joined: Wed Dec 31, 1969 7:00 pm
Location: Chicago, USA


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