Re: FRTS Tc > 249ms

Hey Joe,

I see the same thing over here. I can remember getting tripped up on this
once. I'm not sure what I was doing at the time, but I remember spending
some time wondering why I couldnt get the TC to not be 125ms :P

Makes me wonder if the value being displayed for TC is incorrect (as in,
when you plug in 64000cir and 16000bc, it shows 125ms)? The math doesnt add
up. Sort of wierd.

Chris

On Thu, Aug 13, 2009 at 2:33 AM, Joe Astorino <jastorino_at_ipexpert.com>wrote:

> Has anybody else run into this? I have tried it on several routers ,
> different platforms , different IOS. I can't seem to get a Tc > 249ms.
> For instance, I have:
>
> CIR = 64,000
> Be = 8000
> Tc = 125ms in "show traffic-shape"
>
> Exactly as we would expect. However...
>
> CIR = 64000
> Be = 16000
> Tc STILL = 125ms in "show traffic-shape"
>
> But wait, theres more : )
>
> CIR = 64000
> Be = 15999
> *Tc = 249ms*
>
> hmmmmm....relevant show output below. Is there a 249ms limit?
>
>
> R2(config-fr-dlci)#do sh ver | i 12.4
> Cisco IOS Software, 3600 Software (C3640-IK9O3S-M), Version *12.4(23)*,
> RELEASE SOFTWARE (fc1)
>
> R2(config-map-class)#do sh run | s map-class
> map-class frame-relay FRTS
> frame-relay cir 64000
> frame-relay bc 8000
>
> R2(config-map-class)#do sh run int s2/0
> Building configuration...
>
> Current configuration : 474 bytes
> !
> interface Serial2/0
> no ip address
> encapsulation frame-relay
> ipv6 address 2001:0:0:200::2/64
> ipv6 address FE80::2 link-local
> serial restart-delay 0
> no fair-queue
> frame-relay traffic-shaping
> frame-relay map ipv6 2001:0:0:200::2 206
> frame-relay map ipv6 2001:0:0:200::4 204 broadcast
> frame-relay map ipv6 2001:0:0:200::5 205 broadcast
> frame-relay map ipv6 2001:0:0:200::6 206 broadcast
> *frame-relay interface-dlci 204
> class FRTS*
> no frame-relay inverse-arp
> end
>
> R2(config-map-class)#do sh traffic
>
> Interface Se2/0
> Access Target Byte Sustain Excess Interval Increment Adapt
> VC List Rate Limit bits/int bits/int (ms) (bytes)
> Active
> 204 64000 1000 8000 0 *125* 1000 -
>
> R2(config)#map-class frame-relay FRTS
> R2(config-map-class)#frame-relay bc *15999*
>
> R2(config-map-class)#do sh traffic
>
> Interface Se2/0
> Access Target Byte Sustain Excess Interval Increment Adapt
> VC List Rate Limit bits/int bits/int (ms) (bytes)
> Active
> 204 64000 1999 15999 0 *249* 1992 -
>
> R2(config)#map-class frame-relay FRTS
> R2(config-map-class)#frame-relay bc *16000*
>
> R2(config-map-class)#do sh traffic
>
> Interface Se2/0
> Access Target Byte Sustain Excess Interval Increment Adapt
> VC List Rate Limit bits/int bits/int (ms) (bytes)
> Active
> 204 64000 1000 16000 0 *125* 1000 -
>
>
>
>
>
> --
> 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
>
>
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Received on Thu Aug 13 2009 - 18:32:05 ART