Re: qos

Hi Tim,

An example I used with a customer was to use hqos for sub-rate ethernet
sub-interfaces on a PE router servicing multiple customers and CEs with
different service characteristics.

The parent policy would be the aggregate shaper for the overall bandwidth
that the customer had purchased - this treat the child policy as a single
class and shape it. This way queues not in use could burst up to the
aggregate bandwidth and protect customers from starving each other.

The child policy would have multiple queues e.g. LLQ if the customer had
purchased realtime services like voice and set bandwidth and wred for the
interactive queue e.g.telnet/citrix and the catch-all class-default could
have fair-queuing.

Other reasons for different queuing hierarchies may be of more interest on
inter-network/AS links if you want to bundle different
microflow/applications into an aggregate for your networks internal
behavior but the SP/other network treats things differently - you may use a
parent class to manipulate things to suit that network.

Cheers,
Adam

On Fri, Sep 14, 2012 at 10:26 PM, Tim Cribbs Jr. <tmcribbs_at_gmail.com> wrote:

> Pardon me jumping in here - I just have a question about the original
> question...
>
> I understand that the question is referring to hierarchical qos - I
> get that. But would there be a typical situation where you would want
> to nest 'different' qos mechanisms (llq, cbwfq, etc)? Or is the
> question just a "what if" scenario? My assumption is that best
> practice would be to pick one and stick with it, but that is just how
> I see it in my head. But if it is a "what if," then I understand.
>
> On Thu, Sep 13, 2012 at 6:26 PM, ron wilkerson <ron.wilkerson_at_gmail.com>
> wrote:
> > This is normal practice, called hierarchical qos.
> >
> http://www.cisco.com/en/US/docs/ios/12_2/qos/configuration/guide/qcfmcli2.html#wp1023458
> >
> > On Thu, Sep 13, 2012 at 3:55 PM, Imran Ali <immrccie_at_gmail.com> wrote:
> >
> >> Hi all,
> >>
> >> can we do rete-limiting , llq , cbwfq all in child policy map with
> >> different classes and then shaping in parent policy map ?
> >>
> >> are their any caveats to consider ?
> >>
> >>
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Received on Sat Sep 15 2012 - 16:25:31 ART