draft-ietf-ccamp-lsp-dppm-07.txt   draft-ietf-ccamp-lsp-dppm-08.txt 
Network Working Group W. Sun, Ed. Network Working Group W. Sun, Ed.
Internet-Draft SJTU Internet-Draft SJTU
Intended status: Standards Track G. Zhang, Ed. Intended status: Standards Track G. Zhang, Ed.
Expires: February 2, 2010 CATR Expires: February 3, 2010 CATR
August 26, 2009 September 8, 2009
Label Switched Path (LSP) Dynamic Provisioning Performance Metrics in Label Switched Path (LSP) Dynamic Provisioning Performance Metrics in
Generalized MPLS Networks Generalized MPLS Networks
draft-ietf-ccamp-lsp-dppm-07.txt draft-ietf-ccamp-lsp-dppm-08.txt
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79. This document may contain material provisions of BCP 78 and BCP 79. This document may contain material
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available before November 10, 2008. The person(s) controlling the available before November 10, 2008. The person(s) controlling the
copyright in some of this material may not have granted the IETF copyright in some of this material may not have granted the IETF
Trust the right to allow modifications of such material outside the Trust the right to allow modifications of such material outside the
IETF Standards Process. Without obtaining an adequate license from IETF Standards Process. Without obtaining an adequate license from
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and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
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This Internet-Draft will expire on February 27, 2010. This Internet-Draft will expire on March 11, 2010.
Copyright Notice Copyright Notice
Copyright (c) 2009 IETF Trust and the persons identified as the Copyright (c) 2009 IETF Trust and the persons identified as the
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This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents in effect on the date of Provisions Relating to IETF Documents in effect on the date of
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Please review these documents carefully, as they describe your rights Please review these documents carefully, as they describe your rights
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be undefined if all the dT values are undefined. In addition, the be undefined if all the dT values are undefined. In addition, the
metric minimum SHOULD be set to undefined if the sample is empty. metric minimum SHOULD be set to undefined if the sample is empty.
14.2. The Median of Metric 14.2. The Median of Metric
Metric median is the median of the dT values in the given sample. In Metric median is the median of the dT values in the given sample. In
computing the median, the undefined values MUST NOT be counted in. computing the median, the undefined values MUST NOT be counted in.
14.3. The percentile of Metric 14.3. The percentile of Metric
The percentile of Metric is defined as: given a metric and a percent The "empirical distribution function" (EDF) of a set of scalar
X between 0% and 100%, the Xth percentile of all the dT values in the measurements is a function F(x) which for any x gives the fractional
sample." In addition, the percentile is undefined if the sample is proportion of the total measurements that were <= x.
empty.
Example: suppose we take a sample and the results are: Stream1 = < Given a percentage X, the X-th percentile of Metric means the
<T1, 100 msec>, <T2, 110 msec>, <T3, undefined>, <T4, 90 msec>, <T5, smallest value of x for which F(x) >= X. Undefined values
500 msec> > MUST NOT be counted in.
Then the 50th percentile would be 110 msec, since 90 msec and 100 See RFC2330 for further details.
msec are smaller, and 110 and 500 msec are larger (undefined values
are not counted in).
14.4. Failure statistics of Metric 14.4. Failure statistics of Metric
In the process of LSP setup/release, it may fail due to various In the process of LSP setup/release, it may fail due to various
reasons. For example, setup/release may fail when the control plane reasons. For example, setup/release may fail when the control plane
is overburdened or when there is resource shortage in one of the is overburdened or when there is resource shortage in one of the
intermediate nodes. Since the setup/release failure may have intermediate nodes. Since the setup/release failure may have
significant impact on network operation, it is worthwhile to report significant impact on network operation, it is worthwhile to report
each failure cases, so that appropriate operations can be performed each failure cases, so that appropriate operations can be performed
to check the possible implementation,configuration or other to check the possible implementation,configuration or other
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