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Re: IP-Internets

  • From:
  • Date: Fri Oct 15 09:53:37 1999

BTW, the vast majority of SONET/SDH equipments achieve sub-50ms path protection
switching. (Requirement in BellCore/Telcordia states that SONET equipment must
detect a failure within 10ms and perform protection switching in no more than

Also, the mechanisms by which fast restoral happens in MPLS are usually tied to
SONET/SDH signals like:LOS (Loss Of Signal) and SD/SF (Signal Degrade/Signal


Alan Hannan <> on 10/14/99 07:27:06 PM

To:   Bulent Yener <>
cc: (bcc: Jeanlou Dupont/RMQ/RELTECCORP)

Subject:  Re: IP-Internets

  3 bits of clarification:

>   Some stick MPLS in the middle ala IP/MPLS/HDLC or IP/MPLS/SONET.

  This was dumb.  I meant, ala IP/MPLS/HDLC or IP/MPLS/PPP.

  A couple of folks mailed me to state that MPLS as a transport
  technology was in the future, isn't it?  In fact, 2 networks
  including our own have deployed large [mostly ubiquitous]
  MPLS deployments, where most traffic runs on it, one all over,
  another in certain regions/areas.

  Finally, I was 'reminded' that MPLS convergence will actually
  surpass SONET w/ restoral times, on the order of << 50 ms.  Really
  real soon now.


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