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Cisco ASR1001 dropping packets at size 11465+

Hi All,

I am having a problem with a new ASR1001 we have just  installed. We have connected it via single mode fibre to a Cisco 7609,  with a /30 IP address. The interface uses MTU 9216 (the max) and is up  and working ok. However when we do a ping sweep across the interface it  begins dropping packets which are a large size. It never drops small  packets, only large ones. Upon investigating further i found the loss  starts at size 11465. So pings at size 11464 are fine, 100% success,  however 11465 shows 30% packet loss. This level of packet loss does not  rise the larger the size of the ping it stays about the same. The  packets drop completely randomly, no pattern, sometimes 10 work in a  row, sometimes 10 fail, sometimes its mixed. I am at a loss as to what  could be causing this, anyone have any suggestions?

Thanks.

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