Say you've got two links between point A and point B.  You set up each link
with a traffic engineering bandwidth of 100 mb/s, which is correct, set up
your traffic engineering interfaces, MPLS, and some VPLS tunnels.

 

You then attempt to move 300 mb/s of traffic from point a to point b.  What
happens? 

a)      100 mb/s of traffic is simply dropped

b)      Each link is oversubscribed proportionately, leading to latency and
possibly packet loss

c)       Something entire different?

 

The reason I ask is that there can be challenges to defining bandwidth
availability on some kinds of links; wireless links that experience things
like rain fade or transient drops in modulation due to environmental effects
or temporary interference, rates with adaptive asymmetrical bandwidth
allocation, and so on.

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