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About "extra traffic" and "seperate LSP" in Y.1720

  • From: lidefeng <lidefeng@huawei.com>
  • Date: Tue, 26 Aug 2003 17:16:27 +0800
  • Cc: mpls@UU.NET

In section 7.1.4("Switch initiation criteria") of TD25R1(plen) at the ITU-T
SG13 meeting of Geneva,21 July - 1 August 2003(Draft Revised Recommendation
Y.1720 (Protection
switching for MPLS networks)), it notes that "NOTE 1 - A forced switch for
working LSP should not be overridden by a Signal Fail on the protection LSP.
Since unidirectional protection switching is being performed and no APS
protocol is supported over the protection LSP, Signal Fail on the protection
LSP does not interfere with the ability to perform a forced switch for
working LSP."

But if there is a Signal Fail on the protection LSP,how can the protection
LSP work normally,after the traffic on the working LSP is "Forced Switched"
to the protection LSP,then the traffic may be in outage,is there any
detection action or any alarm signal sent before the forced switch?

What is your consideration?

Defeng Li
Huawei Technologies