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I've to do each month a traffic report to analyses the evolution of bandwidth. Last saturday 27th October, the hour change, the clocks were turned backward 1 hour. During the changing hour, we notice a huge increase of the feed bandwidth to impossible values, as you can see on the pictures attached. We notice abnormal values on cable plant too. The CMTS UBR10k are connected in layer2 to BGP Router.
My question : Have anyone notice the same behavior ? Someone know the cause of such behavior ?
I don't think there is any extra traffic on your network.
Instead it's probably just a glitch in your graphing system when the clock goes backwards for daylight savings.
My guess is when the time change happened instead of using GMT as the storage it used localtime, so you had duplicate traffic additions during that hour, forget about it...