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Hierarchical LSPs

  • From: Spice Sylvia <falsesylvia@yahoo.co.uk>
  • Date: Tue, 12 Apr 2005 09:43:33 +0100 (BST)
  • Resent-Date: Tue, 12 Apr 2005 04:43:42 -0400
  • X-Scanned-By: MIMEDefang 2.45

Hi,

Can someone please help me understand why the
"capacity" of the wire itself cannot be treated as the
outer most constrain, rather than making a
hierarchical association.

In other words:

N1---N2----N3---N7--N4---N5--N6

I see that folks define a FA from N3 to N4, inside
which another FEC from N2 to N5 is created and another
N1 to N6 hierarchy is put inside it.

Howevr in all cases the CAC/setup is done from N1 to
N6.

Is there a reason why the FEC hierarchy is built? Why
does the "capacity of the wire" not act as the FEC
itself?

Is "maintaining the state" of each inner LSP on
intermediate node a problem?

-brgds
Sylvia


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