My apologies, I said CBWFQ when I meant LLQ (I have been using them
synonymously since LLQ was built off CBWFQ). LLQ is the way to go.
In regards to jitter; yes a voice packet could still get stuck behind a
large packet if the packet happens to get to the outbound interface first.
Cisco recommends LFI for links
To: "Will"
Cc:
Sent: Wednesday, June 06, 2001 12:18 AM
Subject: Re: VoIP QoS [7:6586]
>
> Can you elaborate on this a little? I mean LLQ is basically PQ-CBWFQ, and
> offers a CBR priority queue for the voice to use. With CBWFQ your voice
> traffic is going to be weighted based on class, just like other traffic,
> and even in a best case scenerio could still get some packet trains
> causing unpredicatable latency..............or are you recommending
> CBWFQ solely based on bugs in LLQ?
>
> Thanks,
>
> Brian
>
>
> On Mon, 4 Jun 2001, Will wrote:
>
> > Yes, CBWFQ is the way to go....
> >
> > ""Tony Medeiros"" wrote in message
> > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > The Cisco AVVID guru's just told me to bail on LLQ and go to CBWFQ
> > instead.
> > > Problems with code or just works better according to them.
> > > Tony
> > > #6172
> > >
> > > ----- Original Message -----
> > > From: Michael L. Williams
> > > To:
> > > Sent: Sunday, June 03, 2001 8:56 AM
> > > Subject: Re: VoIP QoS [7:6586]
> > >
> > >
> > > > I thought 768Kbps was the minimum you needed NOT to use LFI.......
at
> > > > 768Kbps, it takes ~15ms for a 1500byte frame to be put on the line.
So
> > > even
> > > > if a couple 1500-byte ethernet frames came between your voice
frames, it
> > > > would wouldn't be too bad....... but depending on the queuing
method,
> > even
> > > > at 768Kbps, the regular ethernet traffic could indeed cause a
> > > problem.......
> > > > you could use a priority queue to make sure that all the voice
traffic
> > > > *always* goes through before any of the other traffic, but from what
I
> > > > understand the LLQ is much better for these purposes.
> > > >
> > > > Mike W.
> > > >
> > > > "Brian" wrote in message
> > > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > > > What codec are you using? If the speed of the link is T1 or less
I
> > > would
> > > > > definitly do LFI. Otherwise large packets (1500 bytes) could be
> > starving
> > > > > the voice from the minimum latency that it needs.
> > > > >
> > > > > Brian
> > > > >
> > > > >
> > > > > On Thu, 31 May 2001, Amit Gupta wrote:
> > > > >
> > > > > > Hi Everybody,
> > > > > >
> > > > > > I have configured the following parameters on the
> > > > > > serial interface for VoIP.The quality of the calls is
> > > > > > not very good during working hours you can feel some
> > > > > > delay/small interruptions while using it.
> > > > > >
> > > > > > interface serial 0
> > > > > > ip tcp header-compression iphc-format
> > > > > > no ip mroute-cache
> > > > > > no fair-queue
> > > > > > ip rtp header-compression iphc-format
> > > > > > ip rtp priority 16384 16383 64
> > > > > >
> > > > > > Could anybody suggest any other alternative to improve
> > > > > > the quality.
> > > > > > Will removing the compression help ?
> > > > > > Do I need to have something like Link Fragmentation
> > > > > > and Interleaving configured.
> > > > > >
> > > > > > Thanks
> > > > > >
> > > > > > Amit
> > > > > >
> > > > > >
> > > > > >
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> > > > > Brian Feeny,CCDP,CCNP+VAS Scarlett Parria
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> > > > > 318-213-4709 318-213-4701
> > > > >
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> I'm buying / selling used CISCO gear!!
> email me for a quote
>
> Brian Feeny,CCDP,CCNP+VAS Scarlett Parria
> [EMAIL PROTECTED] [EMAIL PROTECTED]
> 318-213-4709 318-213-4701
>
> Netjam, LLC http://www.netjam.net
> 333 Texas St. VISA/MC/AMEX/COD
> Suite 1401 30 day warranty
> Shreveport, LA 71101 Cisco Channel Partner
> toll free: 866-2NETJAM
> phone: 318-212-0245
> fax: 318-212-0246
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=7510&t=6586
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