The MPLS WG Archive

[nitin p <nitin_panj@yahoo.com>]

Alok,
> hi Nitin,
> 
> just curious...
> your IP result says "0.023" end to end..
> can u share "IP across what was your ingress LER" 
> IP across your Egress LER 
> and IP across your core too for a given packet?
In my measuremnts these delays are at a hop.

  --H--e0[NODE]e1---H--
    |               |
    +---[SNIFFER]---+
H: Hub
Node:LSR/LER/L3 router
I am calculating delays at e0 and e1 and difference
will give the hop delay. Someone please correct me if
there is some problem in my measuring technique.

So end-to-end delay will be : n*(perhop-delay), in
case of IP, assuming link speed is fast enough.

Thanks,
Nitin





> 
> -rgds
> alok
> ----- Original Message ----- 
> From: nitin p <nitin_panj@yahoo.com>
> To: <GAlmaalouf@aol.com>; <eosborne@cisco.com>;
> <jshen@cad.zju.edu.cn>
> Cc: <rameshbabu_j@infosys.com>;
> <mpls-ops@mplsrc.com>; <mpls@UU.NET>
> Sent: Monday, December 09, 2002 7:54 PM
> Subject: Re: [MPLS-OPS]: Jitter and MPLS
> 
> 
> > Hi George,
> > I have posted my results in of the mails, but here
> > they are again:
> > 
> > Ingress: 3.665 milli seconds
> > Egress: 0.035 milliseconds
> > core:    0.018 milliseconds
> >  
> > IP: 0.023 milliseconds.
> > 
> > For my measurements I have attached a sniffer at
> both
> > incomming and outgoing interface (same sniffer for
> > both so no clocking issue). I did the same thing
> for
> > boths LSR and LERs. Question of number of LSRs
> should
> > not affect the results, considering my measuring
> > technique.
> > Jing said He is also getting similar results, I am
> not
> > sure how he has done his measurement.
> > 
> > Thanks,
> > Nitin
> >  
> >  
> > 
> > --- GAlmaalouf@aol.com wrote:
> > > Nitin-
> > > 
> > > It would be much helpful if you can specify the
> > > delay in a quantitative 
> > > manner. This way we can really understand what
> are
> > > you talking about in term 
> > > of delays.  Also, the specific number of Hops or
> LPS
> > > router, how many egress 
> > > and ingress steps involved in the calculation. A
> > > general observation would 
> > > not  be very accurate, since the implementation
> > > would be very different from 
> > > one application versus the other, and from one
> type
> > > of services versus 
> > > another.
> > > 
> > > Thanks-
> > > 
> > > George
> > > 
> > > 
> > > 
> > 
> > 
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> 


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