[c-nsp] SDSL Multilink PPP high latency / lost fragments / input errors on cisco 7200

[Peter Rathlev]

On Fri, 2010-03-26 at 14:16 +0100, Johannes Jakob wrote:
> when using packet based multipath, will that be a problem for voice
> and/or UDP packets?

In short: It's possibly a problem for voice traffic.

If the traffic is distributed "per packet" across the multiple paths,
and not "per flow", you might introduce out-of-order packets and some
amount of jitter. This might or might not be a problem, depending on the
amount of jitter/OoO.

To avoid that, either make sure the members in the multilink are very
close in terms of latency or make sure all packets from a single flow
use the same member. The latter of course prevents you from having a
single flow taking up more than the bandwidth of a single member.

(It might be less a problem for "generic UDP" compared to TCP, since TCP
packets need to be reassembled in order, making OoO packets a problem.
UDP gives no such guarantees.)

-- 
Peter