Re: LLQ

A side note / distraction if you will, ... when I read LLQ, my mind changed
it to LOL. ;-)

Is it Friday yet?

Andrew Lee Lissitz

.

On Tue, Dec 8, 2009 at 1:31 PM, Edison Ortiz <edisonmortiz_at_gmail.com> wrote:

> The documentation and my testing say otherwise:
>
>
>
> "When the device is not congested, the priority class traffic is allowed to
> exceed its allocated bandwidth. When the device is congested, the priority
> class traffic above the allocated bandwidth is discarded."
>
>
>
>
> http://www.cisco.com/en/US/docs/ios/qos/command/reference/qos_n1.html#wp1048
> 842
>
>
>
>
>
> Edison Ortiz
>
> Routing and Switching, CCIE # 17943
>
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Ahmed Elhoussiny
> Sent: Tuesday, December 08, 2009 1:19 PM
> To: Tony Varriale
> Cc: Cisco certification
> Subject: Re: LLQ
>
>
>
> Dear all,
>
> if LLQ is used for VOIP, it will get dropped/policed in case
>
> the traffic exceeds the LLQ size.
>
> And this in case there is congestion and same if there is no congestion.`
>
> LLQ got nothin to do with congestion, this is based on IOS & IOS XR
>
> features & also my testing while designing QOS for my Mobile operator.
>
>
>
> In some references you may find LLQ congestion aware....but this didn't
>
> successfully being implemented till now...
>
>
>
> WHY ?
>
> simply imagine u have an LLQ class with 1 M , and no interface BW
>
> congestion.
>
> VOIP traffic increased to reach 2 M, and no drops cuz of no congestion due
>
> to not used BW on other classes...
>
> SO what if the traffic in other queues increased, and reached its 100 %,
> now
>
> the LLQ will decrease to reach 1 M, and all VOIP calls will get some
> packets
>
> dropped which will affect most of VOIP calls...
>
>
>
> Hope this might help
>
>
>
> Thanks & B.regards
>
> Ahmed Elhoussiny,2x CCIE# 21988 (R&S-SP)
>
> Network Consultant & Cisco Academy Instructor
>
>
>
> On Tue, Dec 8, 2009 at 6:54 PM, Tony Varriale
> <tvarriale_at_flamboyaninc.com>wrote:
>
>
>
> > I thought the priority queue won't use the general bucket when it's over
>
> > its
>
> > defined number? Hence, all packets will get dropped.
>
> >
>
> > tv
>
> >
>
> >
>
> > -----Original Message-----
>
> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>
> > Narbik Kocharians
>
> > Sent: Tuesday, December 08, 2009 10:20 AM
>
> > To: Wouter Prins
>
> > Cc: jack daniels; Cisco certification
>
> > Subject: Re: LLQ
>
> >
>
> > If you like the voice traffic to get 1M and 1M ONLY, then, provide LLQ
> and
>
> > Police that traffic at the same time. Very common.
>
> >
>
> > On Tue, Dec 8, 2009 at 8:10 AM, Wouter Prins <wp_at_null0.nl> wrote:
>
> >
>
> > > Hello Jack,
>
> > >
>
> > > What do you think would happen to the other traffic if the voice
> traffic
>
> > > was
>
> > > allowed to burst to 2M in a LLQ?
>
> > >
>
> > > Depending on whether the interface is congested or not, the traffic
> would
>
> > > be
>
> > > dropped if it exceeds the bw you specify in the priority command. It's
>
> > sort
>
> > > of a conditional policer. The traffic will not end up in the default
>
> > class.
>
> > >
>
> > > 2009/12/8 jack daniels <jckdaniels12_at_gmail.com>
>
> > >
>
> > > > Hi guys,
>
> > > >
>
> > > > Please help me with the understanding of LLQ -
>
> > > >
>
> > > > If I have a link of 2 MB
>
> > > >
>
> > > > and I reserve 1 MB for VOICE ( LLQ) the if voice exceeds 1 MB will it
>
> > be
>
> > > > droppped or be sent in default class.
>
> > > >
>
> > > >
>
> > > >
>
> > >
>
> > > --
>
> > > Wouter Prins
>
> > > wp_at_null0.nl
>
> > > CCIE #25628
>
> > >
>
> > >
>
> > > Blogs and organic groups at http://www.ccie.net
>
> > >
>
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>
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> > >
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> > >
>
> > >
>
> > >
>
> > >
>
> > >
>
> >
>
> >
>
> > --
>
> > Narbik Kocharians
>
> > CCSI#30832, CCIE# 12410 (R&S, SP, Security)
>
> > www.MicronicsTraining.com
>
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>
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-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net