If you have a large number of hosts communicating then you shouldnt need to
go per packet.  Per packet is generally considered a no-no as it leads to
out of order packets arriving at the remote host, which then has to reorder
the stream.  This kippers the performance of the hosts in most circumstances.

per destination load balancing builds a hash of streams to interface so a
particular stream will always go the same route and so packet arrive in
order.  Different streams are balanced across as many equal routes as youve
got.

Sometimes this hashing can get polarised which is bad (sending more down one
route than the other) so you need to configure "ip cef load-sharing
algorithm universal.

NB:  when I say stream here I mean Source/destination pairs, not including
port numbers etc. like netflow.


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