Naiming,

A specific comment on the crypto overhead:

On Mon, Oct 22, 2018 at 07:38:18PM +0000, Naiming Shen (naiming) wrote:
> 
> Probably just bandwidth increase, and if you need encryption/decryption on 
> the packets,
> then large packets will cost more in CPU.

The BFD protocol has you check the contents over the BFD PDU.  In the case
of an expanded IP payload, this procedure wasn't expected to be modified.
Thus, the crypto load should not increase. 

Covering some of the other comments, the pps of the BFD session need not
increase, alhtough the bps increases.  Scaling is thus a matter of how the
implementation handles scaled bps vs. pps for its BFD implementation.

-- Jeff

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