On Mon, May 09, 2016 at 12:33:37AM -0700, Hal Murray wrote:
> Peering seems natural for the case where you have 2 equal servers and you 
> want them to keep an eye on each other.  Aside from reducing the number of 
> packets by a factor of 2, are there any reasons for using peer rather than 
> server?  Is there any extra information exchanged?

Two reasons:
- ability to push synchronization to the other host, which may
  simplify configuration management a bit as only one peer (active)
  has to be configured with the address of the other peer (passive)
- interleaved mode, which allows the peers to exchange transmit
  timestamps after packets are sent in order to improve accuracy with
  HW timestamping

-- 
Miroslav Lichvar

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