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Cell Relay Retreat>MPLS WG Archive>month:2000-Sep> msg00505



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MPLS/BGP routing question

  • From: Eric Rosen <erosen@cisco.com>
  • Date: Fri, 29 Sep 2000 11:32:14 -0400
  • cc: mpls@UU.NET
  • User-Agent: EMH/1.10.0 WEMI/1.13.2 (Mochimune) FLIM/1.12.1(Nishinokyō) Emacs/20.6 (sparc-sun-solaris2.5.1)MULE/4.0 (HANANOEN)


Matsushima> When a  LSP of PE to  PE broken, BGP  has no way of  LSP broken.
Matsushima> Then, BGP keep  up of VPN routes and VPN  traffic going to black
Matsushima> hole, until LSP available.

Matsushima> As a result,  VPN customer can not back up  their traffic to any
Matsushima> link.

Matsushima> I think this is one of most seriously problem of BGP/MPLS VPN.

The  situation you  are worried  about is  where there  is  IGP connectivity
between the edges,  but for some reason labeled packets  cannot make it from
one edge to another.  I guess we don't really see this as a realistic failure
scenario.  Sure, buggy software could cause this, but there's a million ways
in which buggy software could cause undetected packet loss.