From: Thomwin Chen (thomwin_chen@yahoo.com)
Date: Mon Nov 14 2005 - 04:00:05 GMT-3
Steven,
the be can be set to 0, by using :
R1(config-pmap-c)#shape average 128000 64000 0
R1(config-pmap-c)#do show policy-map int vlan 10
....
class-map: (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
match: protocol http
queue size 0, queue limit 32
packets output 0, packet drops 0
tail/random drops 0, no buffer drops 0, other drops 0
shape: cir 128000, Bc 64000, Be 0
output bytes 0, shape rate 0 bps
...
however, I think the correct way to limit particular traffic is to use policing (police cir)
shaping is not the same with policing...
shaping can only be applied outbound, while policing can be applied inbound and outbound.
and the usage is depends on the case...
please correct me if I'm wrong...
btw, IE Lab 5 and Lab 9 has good example on this.
Rgds,
Thomwin
steven richards <ccie_2005@hotmail.com> wrote:
I see what you mean so GTS would not be good here either and I do not see a
way to set the be value to 0
R2(config-pmap-c)#shape average 128000 ?
<256-154400000> bits per interval, sustained. Needs to be multiple of
128.
Recommend not to configure it, the algorithm will find
out
the best value
R2(config-pmap-c)#
>From: Thomwin Chen
>To: steven richards , ccielab@groupstudy.com
>Subject: Re: Priority Queuing question
>Date: Sun, 13 Nov 2005 21:20:58 -0800 (PST)
>
>Steven,
>
> one of the thing I notice for GTS in MQC is if you don't specify
>anything for the be value,
> the be by default will be set equal to bc.
>
> this is one of the difference between FRTS and GTS in MQC.
> in FRTS, the be by default will be set to 0.
>
> Rgds,
> Thomwin
>
>
>steven richards wrote:
> The only other thing I can think of is using traffic shapping and just
>setting the average to the bandwidth requested. Using traffic shapping
>looks
>like it does not set a burst interval does this sound like a viable
>solution
>or am I missing something ?
>
>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
>Traffic Shaping
>Target/Average Byte Sustain Excess Interval Increment
>Rate Limit bits/int bits/int (ms) (bytes)
>128000/128000 1984 7936 7936 62 992
>
>
> >From: Thomwin Chen
> >To: steven richards , ccielab@groupstudy.com
> >Subject: Re: Priority Queuing question
> >Date: Sun, 13 Nov 2005 20:42:16 -0800 (PST)
> >
> >Steven,
> >
> > the burst interval is automatically set to 200 ms.
> >
> > you can adjust this burst interval manually.
> >
> > Rgds,
> > Thomwin
> >
> >steven richards wrote:
> > 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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