> Let's say you have l2 acl which sits on ip4 arc and yout gbp node which sits 
> on
> "all" arc.
> What will be the packet flow, and how you can say who is 1st?

Good point. You cannot order nodes between arcs, so GBP could not say "runs 
before acl" in that case.
This would basically be dictated by the order of invocation of the arcs by L2 
input, eg. If  "all" is invoked before or after "ip4".
If this is a real issue then the only solutions would be (2) (breaking backward 
compat), (4) or (5) (keeps boilerplate).

ben
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