Network outage same time every day

Talbs13

Talbs13

Talbs13

Soldato
Joined
17 Sep 2005
Posts
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Location
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Hey,

Got a funny one. Internal network goes down same time everyday. 12.02pm and 7.02am for the past 5 days. Doing a power cycle on the core switch fixes the issue. We replaced the core switch but it's still happening.

Setup is 4 3COM 4500 switches, 1 Core, 3 stacked, 2 VLAN's, Data and VOIP.

Installed packeteer and there is a massive spike in outbound traffic at those times. Unfortunately it doesn't show me where it's coming from / too.

No logs on switch, 'display logbuffer' doesn't show anything wrong.

It starting to feel like a virus?

Anyone had anything like this happen to them? Anything I can check. Next troubleshoot steps is set up SPAN and analyse the packets somehow.

Any help / suggestions appreciated.
 
Hey, thanks for the reply. I've turned syslog on and will check when it next goes down. I also haven't checked if I can console on when it goes down, will check today.

Thanks
 
Little update. Syslog reported that Port 15 went DOWN for 3 seconds. Port 15 is a file server. Error log reports error with network bridge.

Packetshaper reported huge spike in outbound IPv6 at 12.01. We don't use IPv6 only 4.

Going to update drivers.
 
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