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Incoming Internet Traffic Problem

Hi

I am having a strange problem on my network, where traffic that is incoming from my internet uplink behaves as if it is being shaped.  After it hits about 60Mbps, it drops right down - sometimes to as low as 300k, although usually somewhere in the 2 - 10Mb range.  I can confirm that the internet supplier is sending all of the traffic, and if I ssh onto router (a 7201) and check the interface I can see from the rx/load that all traffic is being received into the interface - it seems like it's just not being passed on.  I've attached a graph, below, to illustrate this.

traffic.PNG

I can confirm the link is 1000Mbps, full duplex and showing no errors.  Neither I nor the internet supplier are doing any traffic shaping.  Can anybody offer any guidance?  I can post more details, configs, spec, etc, if need be.

Cheers

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