Its my belief that different vendors implement timestamping differently but 
that, at least for 
Arista's low latency switches (7150 series) there is no latency impact, 
that timestamps 
are captured on ingress and written on egress. Note that the hires 
timestamps roll about 
every 6 seconds and you need a keyframe to convert the  timestamp to UTC

Peter

On Thursday, January 11, 2018 at 2:55:47 AM UTC-5, Shoonya wrote:
>
> Hi 
>
> In all documentation, all i find is that hardware timestamping happens at 
> line rate with minimal latency. 
> Any pointers to how much latency is added as a result of hardware 
> timestamping of the network packets. 
>
> Regards 
>
> Shoonya 
>

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