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Cell Relay Retreat>MPLS WG Archive>month:2001-Feb> msg00042



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PHP negotiation

  • From: Bora Akyol <akyol@pluris.com>
  • Date: Wed, 7 Feb 2001 12:33:42 -0800
  • Cc: mpls@UU.NET


I would have to add to this that when you have an MPLS diffserv
network that uses a combination of E and L_LSPs and PHP is
enabled, implementation of PHP in hardware becomes quite
complex due to amount of tables, exception cases and remapping.

I think that PHP is a hack that was useful when routers
could not do at least two lookups when doing a POP. I think it
is an architectural mis-feature and hopefully with time, it will be
used less and eventually deprecated.

Bora

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