From: sirus MOGHADASIAN (cyrus.mgh@gmail.com)
Date: Fri Dec 28 2007 - 09:52:31 ART
Shape policy came to mind before but I never tried it.The only idea that
seems to work is nesting other policies to SHAPE policy due to the fact that
bandwidth and priority commands only works when there is a congestion as
Shiran said.
Paul as you said congestion occurs on external ADSL modem interface rather
than switch interface and think Bruno and Steve suggestions are the only
way to accomplish this task.
And you are right this is not a practice lab scenario , I always when read
about QOS want to aooly it in this situation ,I have tried to set bandwidth
and priority on switch interface but it was not work for sure ;)!
Thanks mates
Cyrus
On Dec 28, 2007 3:54 PM, Paul Cosgrove <paul.cosgrove@heanet.ie> wrote:
> Cyrus will be able to clarify this but it sounds like Steve is correct.
> This does not sound like a practice lab scenario that requires the
> interface to never experience congestion; rather the ethernet interface
> will never become congested because real traffic will never exceed the
> speed of that link. Congestion will occur further on at the slower
> 512Kbps interface of the external ADSL modem, but Cyrus cannot configure
> a QoS policy on that device (it is probably a third party product with
> limited options available). As Steve suggested, by using a policy map
> to lower the available bandwidth of the routers ethernet interface the
> required QoS can then be applied.
>
> Paul.
>
> shiran guez wrote:
> > the priority and bandwidth are not congestion avoidance mechanisms so it
> > mean that in order for them to take effect there need to be congestion
> so
> > that is not answering the requirement of never be congested.
> >
> > for the line to never be congested there need to be usage of Police and
> WRED
> > as WRED can work for TCP flows Police can work for all the rest.
> >
> >
> > On Dec 28, 2007 10:04 AM, Steve <steve.ccie@googlemail.com> wrote:
> >
> >
> >> Hi Cyrus,
> >>
> >> I usually take this one step further. I have many sites in the same
> >> situation. What I do is apply a policy map with bandwidth set to DSL
> >> line speed. I then add a child policy which contains the traffic
> >> specific QoS requirements i.e. what traffic needs priority within the
> >> shaped bandwidth.
> >>
> >> There are some examples on Cisco web site of this - search for
> >> applying QoS policies to GRE Tunnels / Ethernet sub-interfaces.
> >>
> >> HTH,
> >>
> >> Cheers,
> >> Steve
> >>
> >>
> >> On 28 Dec 2007, at 03:40, keith tokash wrote:
> >>
> >>
> >>> If I understand correctly, you have a fast ethernet port feeding
> >>> into a DSL
> >>> line. If you are trying to apply QOS to ensure that certain
> >>> traffic always
> >>> gets sent out of the DSL line, you can:
> >>>
> >>> 1. Mark the traffic as it enters the FastE port, differentiating
> >>> between
> >>> important and non-important traffic
> >>> 2. Apply low-latency queueing to the important traffic as it leaves
> >>> the
> >>> interface headed toward the DSL line
> >>>
> >>> I'm not sure if that helps.
> >>>
> >>> With a few exceptions, secrecy is deeply incompatible with
> >>> democracy and with
> >>> science.
> >>> --Carl Sagan
> >>>
> >>>
> >>>> Date: Fri, 28 Dec 2007 06:34:36 +0330
> >>>> From: cyrus.mgh@gmail.com
> >>>> To: ccielab@groupstudy.com
> >>>> Subject: How to apply QOS on Eth link connected to SP while it
> >>>> never will
> >>>>
> >>> be congested!!?
> >>>
> >>>> I want to apply QOS on ethernet link that connects to ADSL modem
> >>>> (say 512
> >>>> Kbps) ,this interface never will be congested so QOS policy never
> >>>> going to
> >>>> work on it,
> >>>> The only way I found is 4 queue of switch to configure for
> >>>> applying QOS.
> >>>>
> >>>> Is there any other way to configure MQC on this ethernet interface
> >>>> while it
> >>>> is not congested (512 Kbps vs 100Mbps)?
> >>>>
> >>>>
> >>>>
> >>>> Cyrus
> >>>>
> >>>> _____________________________________________________________________
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