Re: Tc default value in GTS

Hey guys,

It looks like it is working the way I would expect. Remember in frame-relay
traffic-shaping the Tc is also dynamically configured by your router
depending on what values you use for CIR and Bc based on the formula Tc =
Bc/CIR.
Using that formula with Bryan's examples I see the same results.

1) 7952/56000 = 0.142s
2) 8000/64000 = 0.125s
3) 128000/512000 = 0.25s

So I guess we can say the "default" is .125s if that is the way you are
configuring your CIR and Bc : )

On Mon, Aug 31, 2009 at 9:16 AM, Anantha Subramanian Natarajan <
anantha.natarajan_at_gravitant.com> wrote:

> Hi Mark,
>
> Sure ,I learned that,in GTS,by default Tc is a variable and able
> to conclude from Bryan,Divin that it does varies in proportion to Bc and
> CIR.
>
> Thanks
>
> Regards
> Anantha Subramanian Natarajan
>
> On Mon, Aug 31, 2009 at 7:56 AM, Mark Matters <markccie_at_gmail.com> wrote:
>
> > Anantha,
> > Share what you learned.
> >
> >
> > On Sun, Aug 30, 2009 at 5:45 PM, Anantha Subramanian Natarajan <
> > anantha.natarajan_at_gravitant.com> wrote:
> >
> >> Thanks Bryan ....Actually I to derived this understanding from DQOS
> >> book..Thank you once again
> >>
> >> Regards
> >> Anantha Subramanian Natarajan
> >>
> >> On Sun, Aug 30, 2009 at 4:42 PM, Bryan Bartik <bbartik_at_ipexpert.com>
> >> wrote:
> >>
> >> > Good question. The only other information I have is from the QoS Exam
> >> > Guide, p355:
> >> >
> >> > "The Tc value defaults to 125 ms, but interestingly, GTS can use
> >> different
> >> > default Tc values, based on the configuration settings you use."
> >> >
> >> > Perhaps someone else can shed some light on the reason...
> >> >
> >> >
> >> > On Sun, Aug 30, 2009 at 3:34 PM, Anantha Subramanian Natarajan <
> >> > anantha.natarajan_at_gravitant.com> wrote:
> >> >
> >> >> Hi Bryan,
> >> >>
> >> >> Thank you very much and whats the logic behind the Tc varying....to
> >> what
> >> >> parameters it varies to .
> >> >>
> >> >> Thanks
> >> >>
> >> >> Regards
> >> >> Anantha Subramanian Natarajan
> >> >>
> >> >> On Sun, Aug 30, 2009 at 4:11 PM, Bryan Bartik <
> bbartik_at_ipexpert.com
> >> >wrote:
> >> >>
> >> >>> It appears to be variable:
> >> >>>
> >> >>> R1(config-if)#int s1/1
> >> >>> R1(config-if)#traffic-shape rate 56000
> >> >>> R1(config-if)#do sho traf
> >> >>>
> >> >>> Interface Se1/1
> >> >>> Access Target Byte Sustain Excess Interval
> Increment
> >> >>> Adapt
> >> >>> VC List Rate Limit bits/int bits/int (ms) (bytes)
> >> >>> Active
> >> >>> - 56000 1988 7952 7952 142 994
> >> -
> >> >>>
> >> >>> R1(config-if)#traffic-shape rate 64000
> >> >>> R1(config-if)#do sho traf
> >> >>>
> >> >>> Interface Se1/1
> >> >>> Access Target Byte Sustain Excess Interval
> Increment
> >> >>> Adapt
> >> >>> VC List Rate Limit bits/int bits/int (ms) (bytes)
> >> >>> Active
> >> >>> - 64000 2000 8000 8000 125 1000
> >> -
> >> >>>
> >> >>> R1(config-if)#traffic-shape rate 96000
> >> >>> R1(config-if)#do sho traf
> >> >>>
> >> >>> Interface Se1/1
> >> >>> Access Target Byte Sustain Excess Interval
> Increment
> >> >>> Adapt
> >> >>> VC List Rate Limit bits/int bits/int (ms) (bytes)
> >> >>> Active
> >> >>> - 96000 1992 7968 7968 83 996
> >> -
> >> >>>
> >> >>> R1(config-if)#traffic-shape rate 512000
> >> >>> R1(config-if)#do sho traf
> >> >>>
> >> >>> Interface Se1/1
> >> >>> Access Target Byte Sustain Excess Interval
> Increment
> >> >>> Adapt
> >> >>> VC List Rate Limit bits/int bits/int (ms) (bytes)
> >> >>> Active
> >> >>> - 512000 3200 12800 12800 25 1600
> >> -
> >> >>> R1(config-if)#
> >> >>>
> >> >>> -hth
> >> >>>
> >> >>> On Sun, Aug 30, 2009 at 12:06 PM, Anantha Subramanian Natarajan <
> >> >>> anantha.natarajan_at_gravitant.com> wrote:
> >> >>>
> >> >>> > Hi All,
> >> >>> >
> >> >>> > When I was going through the Generic Traffic Shaping (GTS) ,I am
> >> >>> seeing 2
> >> >>> > different things,in one place I am seeing the default Tc value is
> >> 125ms
> >> >>> > while summarizing the difference between different shaping
> methods,I
> >> am
> >> >>> > seeing the default Tc value as "Variable" for GTS.Kindly provide
> me
> >> an
> >> >>> > insight on the same.
> >> >>> >
> >> >>> > Thanks for the help
> >> >>> >
> >> >>> > Regards
> >> >>> > Anantha Subramanian Natarajan
> >> >>> >
> >> >>> >
> >> >>> > Blogs and organic groups at http://www.ccie.net
> >> >>> >
> >> >>> >
> >> _______________________________________________________________________
> >> >>> > Subscription information may be found at:
> >> >>> > http://www.groupstudy.com/list/CCIELab.html
> >> >>> >
> >> >>> >
> >> >>> >
> >> >>> >
> >> >>> >
> >> >>> >
> >> >>> >
> >> >>> >
> >> >>>
> >> >>>
> >> >>> --
> >> >>> Bryan Bartik
> >> >>> CCIE #23707 (R&S), CCNP
> >> >>> Sr. Support Engineer - IPexpert, Inc.
> >> >>> URL: http://www.IPexpert.com <http://www.ipexpert.com/> <
> >> http://www.ipexpert.com/>
> >> >>>
> >> >>>
> >> >>> Blogs and organic groups at http://www.ccie.net
> >> >>>
> >> >>>
> >> _______________________________________________________________________
> >> >>> Subscription information may be found at:
> >> >>> http://www.groupstudy.com/list/CCIELab.html
> >> >>>
> >> >>>
> >> >>>
> >> >>>
> >> >>>
> >> >>>
> >> >>>
> >> >>>
> >> >>
> >> >
> >> >
> >> > --
> >> > Bryan Bartik
> >> > CCIE #23707 (R&S), CCNP
> >> > Sr. Support Engineer - IPexpert, Inc.
> >> > URL: http://www.IPexpert.com <http://www.ipexpert.com/> <
> >> http://www.ipexpert.com/>
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> > --
> >
> >
> > -
> > "The more I learn the less I know". This is incredibly frustrating to me.
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>

-- 
Regards,
Joe Astorino - CCIE #24347 R&S
Technical Instructor - IPexpert, Inc.
Cell: +1.586.212.6107
Fax: +1.810.454.0130
Mailto:  jastorino_at_ipexpert.com
Blogs and organic groups at http://www.ccie.net