draft-ietf-ippm-ipdv-06.txt   draft-ietf-ippm-ipdv-07.txt 
Network Working Group C. Demichelis Network Working Group C. Demichelis
INTERNET-DRAFT CSELT INTERNET-DRAFT CSELT
Expiration Date: August 2001 P. Chimento Expiration Date: August 2001 P. Chimento
Ericsson IPI Ericsson IPI
February 2001 February 2001
IP Packet Delay Variation Metric for IPPM IP Packet Delay Variation Metric for IPPM
<draft-ietf-ippm-ipdv-06.txt> <draft-ietf-ippm-ipdv-07.txt>
1. Status of this Memo 1. Status of this Memo
This document is an Internet-Draft and is in full conformance with This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026. all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
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divided into sub-intervals on which the singleton definition of ipdv divided into sub-intervals on which the singleton definition of ipdv
can be applied. The result of this is a sequence of ipdv measurements can be applied. The result of this is a sequence of ipdv measurements
that can be analyzed by various statistical procedures. that can be analyzed by various statistical procedures.
Starting from the definition of the singleton metric of one-way ipdv, Starting from the definition of the singleton metric of one-way ipdv,
we define a sample of such singletons. In the following, the two we define a sample of such singletons. In the following, the two
packets needed for a singleton measurement will be called a "pair". packets needed for a singleton measurement will be called a "pair".
5.1. Metric name 5.1. Metric name
Type-P-One-way-ipdv-stream Type-P-One-way-ipdv-Poisson-stream
5.2. Parameters 5.2. Parameters
+ Src, the IP address of a host + Src, the IP address of a host
+ Dst, the IP address of a host + Dst, the IP address of a host
+ T0, a time + T0, a time
+ Tf, a time + Tf, a time
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time of the max delay packet, transmission time of the min delay time of the max delay packet, transmission time of the min delay
packet, D(max)-D(min)> which is collected for each sub-interval. A packet, D(max)-D(min)> which is collected for each sub-interval. A
second example is the selection function that specifies packets whose second example is the selection function that specifies packets whose
indices (sequence numbers) are just the integers below a certain indices (sequence numbers) are just the integers below a certain
bound. In this case, the sub-intervals are defined by the bound. In this case, the sub-intervals are defined by the
transmission times of the generated packets and the sequence produced transmission times of the generated packets and the sequence produced
is just <T(i), T(i+1), D(i)-D(i+1)> where D(i) denotes the one-way is just <T(i), T(i+1), D(i)-D(i+1)> where D(i) denotes the one-way
delay of the ith packet of a stream. delay of the ith packet of a stream.
This definition of the sample metric encompasses both the definition This definition of the sample metric encompasses both the definition
proposed in [9] and the one proposed in [9]. proposed in [8] and the one proposed in [9].
5.6. Methodology 5.6. Methodology
Since packets can be lost or duplicated or can arrive in a different Since packets can be lost or duplicated or can arrive in a different
order than the order sent, in order to recognize the pairs of test order than the order sent, in order to recognize the pairs of test
packets, they should be marked with a sequence number. For duplicated packets, they should be marked with a sequence number. For duplicated
packets only the first received copy should be considered. packets only the first received copy should be considered.
Otherwise, the methodology is the same as for the singleton Otherwise, the methodology is the same as for the singleton
measurement, with the exception that the singleton measurement is measurement, with the exception that the singleton measurement is
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selected carefully in order to avoid interfering with normal traffic selected carefully in order to avoid interfering with normal traffic
in the network. Such measurements should also be authorized and in the network. Such measurements should also be authorized and
authenticated in some way so that attacks can be identified and authenticated in some way so that attacks can be identified and
intercepted. intercepted.
9. Acknowledgements 9. Acknowledgements
This major revision of the draft resulted from e-mail discussions This major revision of the draft resulted from e-mail discussions
with and suggestions from Mike Pierce, Ruediger Geib, Glenn with and suggestions from Mike Pierce, Ruediger Geib, Glenn
Grotefeld, and Al Morton. For previous revisions of this document, Grotefeld, and Al Morton. For previous revisions of this document,
discussions with Ruediger Geib, Matt Zekaukas and Andy Scherer were discussions with Ruediger Geib, Matt Zekauskas and Andy Scherer were
very helpful. very helpful.
10. References 10. References
[1] V.Paxon, G.Almes, J.Mahdavi, M.Mathis - "Framework for IP [1] V.Paxon, G.Almes, J.Mahdavi, M.Mathis - "Framework for IP
Performance Metrics", RFC 2330 Feb. 1998 Performance Metrics", RFC 2330 Feb. 1998
[2] G.Almes, S.Kalidindi - "A One-Way-Delay Metric for IPPM", RFC [2] G.Almes, S.Kalidindi - "A One-Way-Delay Metric for IPPM", RFC
2679, September 1999 2679, September 1999
[3] ITU-T Recommendation Y.1540 (formerly numbered I.380) [3] ITU-T Recommendation Y.1540 (formerly numbered I.380)
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