Re: QOS Priority

Sameer,
even if your wording is not exactly right, your understanding might be.

Policy maps are used to describe policy. Some of it only applies at
congestion time, some of it applies always.
Implicit policers, those "implicit" from a priority keyword, only work
when software queues are engaged, i.e., congested state.
But if you add a "police" configuration, that is, an explicit policer,
it will work all the time (and platform permitting, in hardware).

Having said that, testing QoS using dynamips is not a good idea. The
actual interfaces are virtual and it may be the case that it behaves as
congested all the time. If that was not enough, QoS rate calculations
depend heavily on accurate timing, which is non existant on dynamips in
part because of idle-pc and friends.

HTH,
-Carlos

Joseph L. Brunner @ 27/08/2012 06:06 -0300 dixit:
> Your describing the "bandwidth" command - which does NOT have a built-in policer; the priority command does.
>
> Check this link -
>
> http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a0080103eae.shtml
>
> don't forget the interface command - "max-reserved-bandwidth"
>
> thanks
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of sameer khan
> Sent: Monday, August 27, 2012 4:53 AM
> To: groupstudy
> Subject: QOS Priority
>
> Hey
>
> I need some clarification on the following, as far as i have understood it, the policy-map will or should only apply when the interface is facing congestion, but i can still see ping being limited to 8kbps. By the way i am testing it in Gns3
>
> Thanks
>
>
> interface FastEthernet0/0
> ip address 10.0.0.3 255.255.255.0
> speed 100
> full-duplex
> service-policy output smtp
>
>
> class-map match-all myclass
> match access-group 105
> !
> !
> policy-map mymap
> class myclass
> priority 8
>
>
>
> access-list 105 permit icmp any any
>
>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net