Re: [ippm] draft-ietf-ippm-duplicate

[Al Morton <acmorton at att.com>]

At 03:15 AM 4/17/2007, Henk Uijterwaal wrote:
> As promised in Prague: 
> I've written up my notes on a duplication metrics
> in an ID and submitted it to the secretariat.  As soon as it comes
> out,
> please comment.
>
> Henk

Also as promised in Prague, here are the latest definitions
of Duplicate and Replicated packet outcomes and parameters 
from the draft revision of Y.1540.  
MPi = Measurement Point i    NSE=Network
Section Ensemble

Al
(not sure if the subscripts will be presented properly in some mail
readers, but it's worth a try...)

5.5.8.3  duplicate IP packet outcome: A duplicate packet
transfer outcome is a 
subset of  successful packet outcomes, and occurs when a single IP
packet 
reference event at a permissible ingress MP0 results in two or
more
 corresponding reference event(s) on at least one permissible egress
MPi, and 
the binary information fields of all the output packets are identical to
the 
original packet. The egress reference event at MPi for a
duplicate packet 
 occurs subsequently to at least one other corresponding egress
reference event 
for the original packet (usually also at MPi). 
Note that in point-to-point communication, there is only one permissible
egress
MPi where the destination host is directly attached to the
NSE. In point-to-
multipoint communication, there may be many permissible egress
MPi for the 
various destinations.

5.5.8.4  replicated IP packet outcome: A replicated packet
transfer outcome 
occurs when a single IP packet reference event at a permissible ingress
MP0 
results in two or more corresponding reference event(s) on at least one
permissible egress MPi, and the binary information fields of
all the output 
packets are identical to the original packet.  The egress reference
event at 
MPi for a replicated packet is the first for the original
packet and occurs 
prior to at least one other egress reference event for a duplicate packet
(usually also at MPi).

6.8        IP packet duplicate
ratio (IPDR): IP packet duplicate ratio is the 
ratio of total duplicate IP packet outcomes to the total of successful IP
packet transfer outcomes minus the duplicate IP packet outcomes in a
population 
of interest.

6.9        replicated IP packet
ratio (RIPR): The replicated IP packet ratio is 
the ratio of total replicated IP packet outcomes to the total of
successful IP 
packet transfer outcomes minus the duplicate IP packet outcomes in a
population 
of interest.





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