[nsp] cannot burst the line
Cheung, Rick
Rick.Cheung@NextelPartners.com
Mon, 23 Sep 2002 10:45:35 -0500
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Felix, how would the traffic burst up to 400kbps during the day
then, and not during the night?
To load balance across the two circuits, you'd want to switch
per-packet, process switched or with CEF for minimal processor hit (on both
ends of the circuit).
Rick Cheung
NPI IT Wan Team, CCNP
-----Original Message-----
From: Felix Lee [mailto:felixlee_hk@hotmail.com]
Sent: Saturday, September 21, 2002 11:01 PM
To: dlewis500@sanbrunocable.com; doleary@juniper.net
Cc: cisco-nsp@puck.nether.net
Subject: Re: [nsp] cannot burst the line
Dear all,
The case has temporary been solved.
Along the file transfer path, there are two sites connected with two frame
relay circuits for load-balancing. We have found the bottle-neck is on
these two circuit. Finally, the traffic can be burst after putting back the
route-cache, but they are no longer in load-balancing.
Please advise if there is any better solution?
Thanks
FL
>From: "D" <dlewis500@sanbrunocable.com>
>To: "Felix Lee" <felixlee_hk@hotmail.com>, "dave o'leary"
><doleary@juniper.net>
>CC: <cisco-nsp@puck.nether.net>
>Subject: Re: [nsp] cannot burst the line
>Date: Fri, 13 Sep 2002 10:40:45 -0700
>
>Used to run into similar issues like this back in the day. Quite
>frequently.
>
>A very simple way to test some of these issues is to run 2-3 concurent file
>transfers.
>
>If one transfer does 220Kb/s, do two transfers fill the pipe to 400+Kb/s?
>If it does, then you know its not the network in the middle thats limiting
>you.
>
>-D
>
>Darrel Lewis
>
>----- Original Message -----
>From: "dave o'leary" <doleary@juniper.net>
>To: "Felix Lee" <felixlee_hk@hotmail.com>
>Cc: <cisco-nsp@puck.nether.net>
>Sent: Friday, September 13, 2002 6:16 AM
>Subject: Re: [nsp] cannot burst the line
>
>
> > At 12:48 AM 9/13/2002 +0000, Felix Lee wrote:
> > >Dear all,
> > >
> > >It is a leased circuit. It can be bursted up to 500K at day time. But
> > >the file copying cannot only occupy half of the bandwidth.
> >
> > Without more details, it is difficult to determine what the issue might
> > be - similar to the question/discussion posted by Blaz Zupan recently.
> >
> > - is there another link/circuit somewhere else in the end to end path
> > that is a bottleneck that would cause either TCP or the
>application
> > to throttle back the transfer to 220kb/s?
> >
> > - was the TCP window of your system holding the transfer rate to a
>lower
> > value because of a long delay? See here for some hints for
> > understanding these issues (although 220 kb/s is really quite
>low,
> > there are also some pretty poor TCP implementations still
>lingering
> > around out there)
> > http://www.psc.edu/networking/perf_tune.html
> >
> > - looking at the switching devices in the path (routers, FR switches,
>ATM
> > switches, ethernet switches) - is there some device somewhere
>that
> > is tossing packets? Is it configured to do so or is it seeing
>some
> > errors in the packets and hence throwing them away?
> >
> > I hope this provides some hints but again it is difficult to diagnose
>further
> > without more information about the network topology and environment.
> >
> > dave
> >
> >
> > >FL
> > >
> > >
> > >>From: Jared Mauch <jared@puck.nether.net>
> > >>To: Felix Lee <felixlee_hk@hotmail.com>
> > >>CC: cisco-nsp@puck.nether.net
> > >>Subject: Re: [nsp] cannot burst the line
> > >>Date: Thu, 12 Sep 2002 10:52:16 -0400
> > >>
> > >> is this frame relay?
> > >>
> > >> if so, most telcos, etc.. have a 50% CIR (Commited
>Information
>Rate)
> > >>that allows you to burst up to 512k at times when there is capacity
>but
> > >>they only commit to giving you 50% of the full link speed.
> > >>
> > >> - jared
> > >>
> > >>On Thu, Sep 12, 2002 at 02:47:12PM +0000, Felix Lee wrote:
> > >> >
> > >> > Dear all,
> > >> >
> > >> > I have a 512K link, the link can be bursted to ceiling in day time.
>I
> > >> have
> > >> > scheduled a job to copy around 3GB data from one end to another
>atthe
> > >> night
> > >> > time, and which was expected to be completed at around 13 to 14
>hours, but
> > >> > we have only got half of the volume transferred. Monitoring by
>MRTG,
>we
> > >> > found the utilization of the link is flat at around 220kbps during
>file
> > >> > copying. Can someone tell me why I cannot fully utilize the
>bandwidth?
> > >> > How can I make it?
> > >> >
> > >> > Thanks in advance.
> > >> >
> > >> > FL
> > >> >
> > >> >
> > >> > _________________________________________________________________
> > >> > Chat with friends online, try MSN Messenger:
>http://messenger.msn.com
> > >> >
> > >> > _______________________________________________
> > >> > cisco-nsp mailing list real_name)s@puck.nether.net
> > >> > http://puck.nether.net/mailman/listinfo/cisco-nsp
> > >> > archive at http://puck.nether.net/pipermail/cisco-nsp/
> > >>
> > >>--
> > >>Jared Mauch | pgp key available via finger from jared@puck.nether.net
> > >>clue++; | http://puck.nether.net/~jared/ My statements are only
>mine.
> > >
> > >
> > >
> > >
> > >_________________________________________________________________
> > >Join the world's largest e-mail service with MSN Hotmail.
> > >http://www.hotmail.com
> > >
> > >_______________________________________________
> > >cisco-nsp mailing list real_name)s@puck.nether.net
> > >http://puck.nether.net/mailman/listinfo/cisco-nsp
> > >archive at http://puck.nether.net/pipermail/cisco-nsp/
> >
> > _______________________________________________
> > cisco-nsp mailing list real_name)s@puck.nether.net
> > http://puck.nether.net/mailman/listinfo/cisco-nsp
> > archive at http://puck.nether.net/pipermail/cisco-nsp/
> >
_________________________________________________________________
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_______________________________________________
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<TITLE>RE: [nsp] cannot burst the line</TITLE>
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<BODY>
<P> <FONT SIZE=3D2>Felix, how =
would the traffic burst up to 400kbps during the day then, and not =
during the night? </FONT>
</P>
<P> <FONT SIZE=3D2>To load =
balance across the two circuits, you'd want to switch per-packet, =
process switched or with CEF for minimal processor hit (on both ends of =
the circuit). </FONT></P>
<BR>
<BR>
<P><FONT SIZE=3D2>Rick Cheung</FONT>
<BR><FONT SIZE=3D2>NPI IT Wan Team, CCNP</FONT>
</P>
<BR>
<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Felix Lee [<A =
HREF=3D"mailto:felixlee_hk@hotmail.com">mailto:felixlee_hk@hotmail.com</=
A>]</FONT>
<BR><FONT SIZE=3D2>Sent: Saturday, September 21, 2002 11:01 PM</FONT>
<BR><FONT SIZE=3D2>To: dlewis500@sanbrunocable.com; =
doleary@juniper.net</FONT>
<BR><FONT SIZE=3D2>Cc: cisco-nsp@puck.nether.net</FONT>
<BR><FONT SIZE=3D2>Subject: Re: [nsp] cannot burst the line</FONT>
</P>
<BR>
<P><FONT SIZE=3D2>Dear all,</FONT>
</P>
<P><FONT SIZE=3D2>The case has temporary been solved.</FONT>
<BR><FONT SIZE=3D2>Along the file transfer path, there are two sites =
connected with two frame </FONT>
<BR><FONT SIZE=3D2>relay circuits for load-balancing. We have =
found the bottle-neck is on </FONT>
<BR><FONT SIZE=3D2>these two circuit. Finally, the traffic can be =
burst after putting back the </FONT>
<BR><FONT SIZE=3D2>route-cache, but they are no longer in =
load-balancing.</FONT>
</P>
<P><FONT SIZE=3D2>Please advise if there is any better solution?</FONT>
</P>
<P><FONT SIZE=3D2>Thanks</FONT>
</P>
<P><FONT SIZE=3D2>FL</FONT>
</P>
<BR>
<P><FONT SIZE=3D2>>From: "D" =
<dlewis500@sanbrunocable.com></FONT>
<BR><FONT SIZE=3D2>>To: "Felix Lee" =
<felixlee_hk@hotmail.com>, "dave o'leary" =
</FONT>
<BR><FONT SIZE=3D2>><doleary@juniper.net></FONT>
<BR><FONT SIZE=3D2>>CC: <cisco-nsp@puck.nether.net></FONT>
<BR><FONT SIZE=3D2>>Subject: Re: [nsp] cannot burst the line</FONT>
<BR><FONT SIZE=3D2>>Date: Fri, 13 Sep 2002 10:40:45 -0700</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>>Used to run into similar issues like this back =
in the day. Quite </FONT>
<BR><FONT SIZE=3D2>>frequently.</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>>A very simple way to test some of these issues =
is to run 2-3 concurent file</FONT>
<BR><FONT SIZE=3D2>>transfers.</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>>If one transfer does 220Kb/s, do two transfers =
fill the pipe to 400+Kb/s?</FONT>
<BR><FONT SIZE=3D2>>If it does, then you know its not the network in =
the middle thats limiting</FONT>
<BR><FONT SIZE=3D2>>you.</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>>-D</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>>Darrel Lewis</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>>----- Original Message -----</FONT>
<BR><FONT SIZE=3D2>>From: "dave o'leary" =
<doleary@juniper.net></FONT>
<BR><FONT SIZE=3D2>>To: "Felix Lee" =
<felixlee_hk@hotmail.com></FONT>
<BR><FONT SIZE=3D2>>Cc: <cisco-nsp@puck.nether.net></FONT>
<BR><FONT SIZE=3D2>>Sent: Friday, September 13, 2002 6:16 AM</FONT>
<BR><FONT SIZE=3D2>>Subject: Re: [nsp] cannot burst the line</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>> > At 12:48 AM 9/13/2002 +0000, Felix Lee =
wrote:</FONT>
<BR><FONT SIZE=3D2>> > >Dear all,</FONT>
<BR><FONT SIZE=3D2>> > ></FONT>
<BR><FONT SIZE=3D2>> > >It is a leased circuit. It can =
be bursted up to 500K at day time. But</FONT>
<BR><FONT SIZE=3D2>> > >the file copying cannot only occupy =
half of the bandwidth.</FONT>
<BR><FONT SIZE=3D2>> ></FONT>
<BR><FONT SIZE=3D2>> > Without more details, it is difficult to =
determine what the issue might</FONT>
<BR><FONT SIZE=3D2>> > be - similar to the question/discussion =
posted by Blaz Zupan recently.</FONT>
<BR><FONT SIZE=3D2>> ></FONT>
<BR><FONT SIZE=3D2>> > - is there another =
link/circuit somewhere else in the end to end path</FONT>
<BR><FONT SIZE=3D2>> =
> that is a =
bottleneck that would cause either TCP or the</FONT>
<BR><FONT SIZE=3D2>>application</FONT>
<BR><FONT SIZE=3D2>> =
> to throttle =
back the transfer to 220kb/s?</FONT>
<BR><FONT SIZE=3D2>> ></FONT>
<BR><FONT SIZE=3D2>> > - was the TCP window of your =
system holding the transfer rate to a </FONT>
<BR><FONT SIZE=3D2>>lower</FONT>
<BR><FONT SIZE=3D2>> =
> value =
because of a long delay? See here for some hints for</FONT>
<BR><FONT SIZE=3D2>> =
> =
understanding these issues (although 220 kb/s is really quite</FONT>
<BR><FONT SIZE=3D2>>low,</FONT>
<BR><FONT SIZE=3D2>> =
> there are =
also some pretty poor TCP implementations still</FONT>
<BR><FONT SIZE=3D2>>lingering</FONT>
<BR><FONT SIZE=3D2>> =
> around out =
there)</FONT>
<BR><FONT SIZE=3D2>> =
> <A =
HREF=3D"http://www.psc.edu/networking/perf_tune.html" =
TARGET=3D"_blank">http://www.psc.edu/networking/perf_tune.html</A></FONT=
>
<BR><FONT SIZE=3D2>> ></FONT>
<BR><FONT SIZE=3D2>> > - looking at the switching =
devices in the path (routers, FR switches,</FONT>
<BR><FONT SIZE=3D2>>ATM</FONT>
<BR><FONT SIZE=3D2>> =
> switches, =
ethernet switches) - is there some device somewhere</FONT>
<BR><FONT SIZE=3D2>>that</FONT>
<BR><FONT SIZE=3D2>> =
> is tossing =
packets? Is it configured to do so or is it seeing</FONT>
<BR><FONT SIZE=3D2>>some</FONT>
<BR><FONT SIZE=3D2>> =
> errors in =
the packets and hence throwing them away?</FONT>
<BR><FONT SIZE=3D2>> ></FONT>
<BR><FONT SIZE=3D2>> > I hope this provides some hints but again =
it is difficult to diagnose</FONT>
<BR><FONT SIZE=3D2>>further</FONT>
<BR><FONT SIZE=3D2>> > without more information about the network =
topology and environment.</FONT>
<BR><FONT SIZE=3D2>> ></FONT>
<BR><FONT SIZE=3D2>> =
> &n=
bsp; &n=
bsp; &n=
bsp; dave</FONT>
<BR><FONT SIZE=3D2>> ></FONT>
<BR><FONT SIZE=3D2>> ></FONT>
<BR><FONT SIZE=3D2>> > >FL</FONT>
<BR><FONT SIZE=3D2>> > ></FONT>
<BR><FONT SIZE=3D2>> > ></FONT>
<BR><FONT SIZE=3D2>> > >>From: Jared Mauch =
<jared@puck.nether.net></FONT>
<BR><FONT SIZE=3D2>> > >>To: Felix Lee =
<felixlee_hk@hotmail.com></FONT>
<BR><FONT SIZE=3D2>> > >>CC: =
cisco-nsp@puck.nether.net</FONT>
<BR><FONT SIZE=3D2>> > >>Subject: Re: [nsp] cannot burst =
the line</FONT>
<BR><FONT SIZE=3D2>> > >>Date: Thu, 12 Sep 2002 10:52:16 =
-0400</FONT>
<BR><FONT SIZE=3D2>> > >></FONT>
<BR><FONT SIZE=3D2>> > =
>> is this frame =
relay?</FONT>
<BR><FONT SIZE=3D2>> > >></FONT>
<BR><FONT SIZE=3D2>> > >>  =
; if so, most telcos, etc.. have a 50% CIR (Commited =
</FONT>
<BR><FONT SIZE=3D2>>Information</FONT>
<BR><FONT SIZE=3D2>>Rate)</FONT>
<BR><FONT SIZE=3D2>> > >>that allows you to burst up to =
512k at times when there is capacity </FONT>
<BR><FONT SIZE=3D2>>but</FONT>
<BR><FONT SIZE=3D2>> > >>they only commit to giving you 50% =
of the full link speed.</FONT>
<BR><FONT SIZE=3D2>> > >></FONT>
<BR><FONT SIZE=3D2>> > =
>> - jared</FONT>
<BR><FONT SIZE=3D2>> > >></FONT>
<BR><FONT SIZE=3D2>> > >>On Thu, Sep 12, 2002 at 02:47:12PM =
+0000, Felix Lee wrote:</FONT>
<BR><FONT SIZE=3D2>> > >> ></FONT>
<BR><FONT SIZE=3D2>> > >> > Dear all,</FONT>
<BR><FONT SIZE=3D2>> > >> ></FONT>
<BR><FONT SIZE=3D2>> > >> > I have a 512K link, the link =
can be bursted to ceiling in day time.</FONT>
<BR><FONT SIZE=3D2>>I</FONT>
<BR><FONT SIZE=3D2>> > >> have</FONT>
<BR><FONT SIZE=3D2>> > >> > scheduled a job to copy =
around 3GB data from one end to another </FONT>
<BR><FONT SIZE=3D2>>atthe</FONT>
<BR><FONT SIZE=3D2>> > >> night</FONT>
<BR><FONT SIZE=3D2>> > >> > time, and which was expected =
to be completed at around 13 to 14</FONT>
<BR><FONT SIZE=3D2>>hours, but</FONT>
<BR><FONT SIZE=3D2>> > >> > we have only got half of the =
volume transferred. Monitoring by </FONT>
<BR><FONT SIZE=3D2>>MRTG,</FONT>
<BR><FONT SIZE=3D2>>we</FONT>
<BR><FONT SIZE=3D2>> > >> > found the utilization of the =
link is flat at around 220kbps during</FONT>
<BR><FONT SIZE=3D2>>file</FONT>
<BR><FONT SIZE=3D2>> > >> > copying. Can someone =
tell me why I cannot fully utilize the</FONT>
<BR><FONT SIZE=3D2>>bandwidth?</FONT>
<BR><FONT SIZE=3D2>> > >> > How can I make it?</FONT>
<BR><FONT SIZE=3D2>> > >> ></FONT>
<BR><FONT SIZE=3D2>> > >> > Thanks in advance.</FONT>
<BR><FONT SIZE=3D2>> > >> ></FONT>
<BR><FONT SIZE=3D2>> > >> > FL</FONT>
<BR><FONT SIZE=3D2>> > >> ></FONT>
<BR><FONT SIZE=3D2>> > >> ></FONT>
<BR><FONT SIZE=3D2>> > >> > =
_________________________________________________________________</FONT>=
<BR><FONT SIZE=3D2>> > >> > Chat with friends online, =
try MSN Messenger: </FONT>
<BR><FONT SIZE=3D2>><A HREF=3D"http://messenger.msn.com" =
TARGET=3D"_blank">http://messenger.msn.com</A></FONT>
<BR><FONT SIZE=3D2>> > >> ></FONT>
<BR><FONT SIZE=3D2>> > >> > =
_______________________________________________</FONT>
<BR><FONT SIZE=3D2>> > >> > cisco-nsp mailing list =
real_name)s@puck.nether.net</FONT>
<BR><FONT SIZE=3D2>> > >> > <A =
HREF=3D"http://puck.nether.net/mailman/listinfo/cisco-nsp" =
TARGET=3D"_blank">http://puck.nether.net/mailman/listinfo/cisco-nsp</A><=
/FONT>
<BR><FONT SIZE=3D2>> > >> > archive at <A =
HREF=3D"http://puck.nether.net/pipermail/cisco-nsp/" =
TARGET=3D"_blank">http://puck.nether.net/pipermail/cisco-nsp/</A></FONT>=
<BR><FONT SIZE=3D2>> > >></FONT>
<BR><FONT SIZE=3D2>> > >>--</FONT>
<BR><FONT SIZE=3D2>> > >>Jared Mauch | pgp key =
available via finger from jared@puck.nether.net</FONT>
<BR><FONT SIZE=3D2>> > =
>>clue++; | <A =
HREF=3D"http://puck.nether.net/~jared/" =
TARGET=3D"_blank">http://puck.nether.net/~jared/</A> My =
statements are only</FONT>
<BR><FONT SIZE=3D2>>mine.</FONT>
<BR><FONT SIZE=3D2>> > ></FONT>
<BR><FONT SIZE=3D2>> > ></FONT>
<BR><FONT SIZE=3D2>> > ></FONT>
<BR><FONT SIZE=3D2>> > ></FONT>
<BR><FONT SIZE=3D2>> > =
>_________________________________________________________________</F=
ONT>
<BR><FONT SIZE=3D2>> > >Join the world's largest e-mail =
service with MSN Hotmail.</FONT>
<BR><FONT SIZE=3D2>> > ><A HREF=3D"http://www.hotmail.com" =
TARGET=3D"_blank">http://www.hotmail.com</A></FONT>
<BR><FONT SIZE=3D2>> > ></FONT>
<BR><FONT SIZE=3D2>> > =
>_______________________________________________</FONT>
<BR><FONT SIZE=3D2>> > >cisco-nsp mailing list =
real_name)s@puck.nether.net</FONT>
<BR><FONT SIZE=3D2>> > ><A =
HREF=3D"http://puck.nether.net/mailman/listinfo/cisco-nsp" =
TARGET=3D"_blank">http://puck.nether.net/mailman/listinfo/cisco-nsp</A><=
/FONT>
<BR><FONT SIZE=3D2>> > >archive at <A =
HREF=3D"http://puck.nether.net/pipermail/cisco-nsp/" =
TARGET=3D"_blank">http://puck.nether.net/pipermail/cisco-nsp/</A></FONT>=
<BR><FONT SIZE=3D2>> ></FONT>
<BR><FONT SIZE=3D2>> > =
_______________________________________________</FONT>
<BR><FONT SIZE=3D2>> > cisco-nsp mailing list =
real_name)s@puck.nether.net</FONT>
<BR><FONT SIZE=3D2>> > <A =
HREF=3D"http://puck.nether.net/mailman/listinfo/cisco-nsp" =
TARGET=3D"_blank">http://puck.nether.net/mailman/listinfo/cisco-nsp</A><=
/FONT>
<BR><FONT SIZE=3D2>> > archive at <A =
HREF=3D"http://puck.nether.net/pipermail/cisco-nsp/" =
TARGET=3D"_blank">http://puck.nether.net/pipermail/cisco-nsp/</A></FONT>=
<BR><FONT SIZE=3D2>> ></FONT>
</P>
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<BR>
<BR>
<P><FONT =
SIZE=3D2>_______________________________________________________________=
__</FONT>
<BR><FONT SIZE=3D2>MSN Photos is the easiest way to share and print =
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<P><FONT =
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