[j-nsp] VCCP protocol

[james list]

Dear experts,
I'm looking information about load balancing inside a virtual chassis of
QFX.

Let's immagine a square topology VC:

      A --- B
       |      |
      C --- D


A is connected to B and C but not directly to D.

How is the internal VC traffic load balanced among the two VC connection (A
to B and A to C) if traffic enters in A and exits in D ?

I'm looking as well on documents, if any please share also privately.

Cheers
James