Re: QOS help 3750 or 3560 switch

Prashant,

Policing on switches takes two input values - the Rate (CIR) and the token
bucket size (Bc). Bc specifies how many bytes can be sent in the Access Rate
before the traffic is considered as exceeding (actually increase this by the
number of bytes that have been refilled during the time it took to serialize
the Bc bytes). The rate specifies how fast the tokens are added to the
bucket (so how many bits is being refilled to the bucket every 0.125ms - Tc
is fixed on switches).

Regards,
Piotr

On Wed, Jun 23, 2010 at 6:26 PM, naman sharma <naman.prep_at_gmail.com> wrote:

> also care must be taken as the formula to calculate Bc and Be is not the
> same for router and switch. Cisco doesnt specifically mention that.
>
> So you should not calculate the Bc with default formula of CIR/32, this is
> for routers.
>
> thanks
> naman
>
> On 16 June 2010 12:26, Tyson Scott <tscott_at_ipexpert.com> wrote:
>
> > Are these Layer2 or Layer3 ports? If it is layer2 you should do the
> > following
> >
> > mls qos
> > mls qos aggregate-policer <name> <CIR> <Burst>
> >
> > policy-map PORT-FA0-X
> > class class-default
> > police aggregate <aggregate-policer name>
> >
> > int Fa0/X
> > service-policy input POLICER
> >
> > Regards,
> >
> > Tyson Scott - CCIE #13513 R&S, Security, and SP
> > Managing Partner / Sr. Instructor - IPexpert, Inc.
> > Mailto: tscott_at_ipexpert.com
> >
> >
> >
> > -----Original Message-----
> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> > Jockey
> > Sent: Monday, June 14, 2010 3:41 PM
> > To: Adrian Brayton
> > Cc: GS CCIE-Lab; narbikk_at_gmail.com
> > Subject: Re: QOS help 3750 or 3560 switch
> >
> > Dear prashant,
> >
> > You can controll inbound traffic till 5.5mb as normal burst is not
> > more than 1mb in 3750
> > Srr-queue bandwith limit can control egress traffic to 1mb by tricky
> > way changing speed 10 duplex full are-queue bandwidth limit 10.
> > So you can solve ur problem til 6mb
> > And if u want to give 10mb to customer do speed 10 duplex full witout
> > qos
> >
> > Sent from my iPhone
> >
> > On Jun 13, 2010, at 21:37, Adrian Brayton <abrayton_at_gmail.com> wrote:
> >
> > > This should work:
> > >
> > > Policy-map GS
> > > class class-default
> > > police 1000000 8000 exceed-action drop
> > >
> > > inter fa 0/X
> > > service-policy in GS
> > >
> > >
> > > On Jun 13, 2010, at 2:16 PM, jockey wearer wrote:
> > >
> > >> Dear All,
> > >>
> > >> Please help me .We are running small ISP.I have some customers
> > >> connected to
> > >> Cisco switch 3750G .
> > >> I have to give bandwidth 1Mb,2Mb,5Mb,8Mb and 10Mb to each customer .
> > >> I tried Police input and srr-queue bandwidth limit to control it
> > >> but it
> > >> doesnt work properly .
> > >> when I do police I am calculating Normal burst by using this
> > >> formula .
> > >>
> > >> Normal burst = require bandwidth x 1.5/8
> > >>
> > >> Police can apply only for ingress traffic and does not support for
> > >> egress
> > >> traffic
> > >> ,srr -queue bandwidth-limit command can use to control egress
> > >> traffic .
> > >>
> > >>
> > >> is it right formula or I am doing something wrong .Please help me I
> > >> am in
> > >> trouble guys .
> > >>
> > >> thanks
> > >> Prashant
> > >>
> > >>
> > >> Blogs and organic groups at http://www.ccie.net
> > >>
> > >>
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>

-- 
Piotr Kaluzny
CCIE #25665 (Security), CCSP, CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com
Blogs and organic groups at http://www.ccie.net