North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: NAPs - Temperature vs Packet loss
I experienced an airflow problem on a 7010 once which just made it shut down and restart when it got hot. Are you sure that this is not happening occesionally? It would seem to me that a 7xxx router should be able to survive its shutdown threshold without affecting performance. Brian Horvitz WebSecure, Inc. On Fri, 28 Mar 1997, Alex.Bligh wrote: > We've noticed an interesting phenomenon with MAE-East. Packet loss > corelates nicely to temperature. > > At first I assumed the relationship was Busy Network => Hot routers > and also Busy Network => Packet Loss. But this is not the case. > It appears to be Hot Routers => Packet Loss. > > Boone Boulevard MAE-East is currently running very hot. Intake temp > on our router has been up to 40 degrees today, and output at 70. > Under these conditions, the router (a 7010) starts dropping a pile > of packets occassionally. Mostly these seem to be through the AIP > and a clear int a0/0 fixes it. The time it stays fixed for is > heavilly corelated with temperature. The higher the temperature, > the shorter it stays fixed for. Eventually MFS put a fan on the > router and it seems a lot better now, intake temperature being > down to 36/37 degrees. > > 40 degrees is Cisco's default "warning" threshold. One would have > thought boxes should work OK at 40 degrees. On the other hand one > might also have thought a 18-22 degree aircon environment was a > prerequisite of running a decent IXP. > > Is anyone else seeing high temperature and otherwise inexplicable > packet loss at MAE-East? Or does anyone else have data to corelate? > > Alex Bligh > Xara Networks > > > - - - - - - - - - - - - - - - - -
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