From: dusth@comcast.net
Date: Mon Nov 14 2005 - 14:24:05 GMT-3
Simon, With my config below then the bust is up to 256kps and the tc is 200ms, correct? What is the default tc on the router for mqc if it's not be modified, 200?
Rack1R6#sh policy-map interface f0/0
FastEthernet0/0
Service-policy output: test
Class-map: class-default (match-any)
8 packets, 1016 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
police:
cir 128000 bps, bc 6400 bytes
conformed 0 packets, 0 bytes; actions:
transmit
exceeded 0 packets, 0 bytes; actions:
drop
conformed 0 bps, exceed 0 bps
Rack1R6#
Dustin
-------------- Original message --------------
> Hi Bob,
>
> Understood and agreed. It polices under congestion conditions
>
> Simon
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of Bob
> Sinclair
> Sent: 14 November 2005 16:23
> To: simon hart; ccielab@groupstudy.com
> Subject: Re: Priority Queuing question
>
>
> Simon,
>
> Perhaps I misunderstood your comment, but just to be clear: the MQC
> priority
> command will police prioritized flows only under conditions of congestion.
> But the flows will take all the bandwidth they require otherwise. As long
> as
> the bandwidth is available, the priority command does not police. If you
> want to set a hard cap on prioritized traffic, you will need to add a police
> command. Some (othterwise) very good documentation is wrong on this point.
> Try labbing it up.
>
> HTH,
>
> Bob Sinclair
> CCIE #10427, CCSI 30427
> www.netmasterclass.net
>
> ----- Original Message -----
> From: simon hart
> To: steven richards ; ccielab@groupstudy.com
> Sent: Monday, November 14, 2005 10:37 AM
> Subject: RE: Priority Queuing question
>
>
> Hi Steven,
>
> The commands below will guarantee 128kbps and no more, there is no burst
> above 128kbps.
>
> The priority command has two functions, one is to prioritise the packets
> assigned to this queue, that is they will be the first out of the
> interface.
> The second function is to police the packets to the bandwidth required.
>
> Now the show policy map
>
> Bandwidth 128 (kbps) Burst 3200 (Bytes)
>
> is showing you what the committed burst rate is, not the excess burst.
>
> MQC tc in this scenario defaults to 200ms, therefore 128000 *.2 = 25600.
> Convert to bytes 25600 /8 = 3200 bytes. Therefore for each 200ms, the
> policer will allow 25600 bits to be sent, and thus 128kbps no more no less
>
> HTH
>
> Simon
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> steven richards
> Sent: 14 November 2005 04:34
> To: ccielab@groupstudy.com
> Subject: Priority Queuing question
>
>
> Hello,
>
> I am trying to use priority queueing beacuse I am interested in
> guarenteing
> a certain amount of bandwidth, withought going over the guereenteed
> bandwidth. One thing I noticed is that with configuring priority queueing
> there appears to be a burst automatically configured. Is there a way to
> just
> configure priority queueing withought that autoconfugred burst ?
>
> Thanks,
>
>
>
> R2#show policy-map interface e0/0
> Ethernet0/0
>
> Service-policy output: QOS
>
> Class-map: PREC2 (match-all)
> 0 packets, 0 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: ip precedence 2
> Queueing
> Strict Priority
> Output Queue: Conversation 264
> Bandwidth 128 (kbps) Burst 3200 (Bytes) <----- Burst
> automatically
> configured ?
> (pkts matched/bytes matched) 0/0
> (total drops/bytes drops) 0/0
>
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