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Cell Relay Retreat>MPLS WG Archive>month:2002-May> msg00271



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Basic LDP Question

  • From: jh@lohi.eng.song.fi
  • Date: Fri, 31 May 2002 22:31:07 +0300
  • Cc: Shahram Davari <Shahram_Davari@pmc-sierra.com>, "'Giles Heron'" <giles@packetexchange.net>, "'Yakov Rekhter'" <yakov@juniper.net>, "'mpls@uu.net'" <mpls@UU.NET>, "'ppvpn@ppvpn.francetelecom.com'" <ppvpn@ppvpn.francetelecom.com>

Robert Raszuk writes:

 > C) Loadbalancing in the core ... See when you encapsulate all of your
 > PE-PE traffic in one IP header, the FIB hash will be identical to all
 > VPN customers residing on those PEs hence all the packets will take the
 > same path. This is very bad indeed. In MPLS we can build the hash based
 > on labels or even look higher at the original VPN IP packet so the
 > distribution of VPN flows in the core is much more larger. 

what would prevent you from taking into account l2tp session id when
calculating the hash?

-- juha