Re: Interesting FRTS Behavior Driving Me Mad

Oh yeah and the essential: two different IOS , two different platforms...

R2(config-map-class)#do sh ver | i 12.4
Cisco IOS Software, 3800 Software (C3825-ADVENTERPRISEK9-M), Version
12.4(24)T1, RELEASE SOFTWARE (fc3)

R5(config-if)#do sh ver | i 12.4
Cisco IOS Software, 3600 Software (C3640-JK9O3S-M), Version 12.4(13a),
RELEASE SOFTWARE (fc1)

On Mon, Nov 30, 2009 at 3:02 AM, Joe Astorino <jastorino_at_ipexpert.com>wrote:

> Has anybody seen anything like this before? It seems the formula for how
> my router is calculating Tc dynamically changes based on the given value of
> Bc which I have not read about in any book or cisco doc as of yet.
>
>
> R2(config-map-class)#do sh run int s0/1/0 | i frame-relay
> encapsulation frame-relay
> frame-relay class foo
> frame-relay traffic-shaping
> frame-relay map ip 100.100.100.5 205 broadcast
> no frame-relay inverse-arp
>
> R2(config-map-class)#do sh run | beg map-class
> map-class frame-relay foo
> frame-relay cir 768000
> frame-relay bc 80007
>
> With this setup, I expect the long standing formula Tc = Bc / CIR to hold
> true. Therefore Tc should be equal to 80007 / 768000 = 0.10417578125
> seconds = 104ms rounded down and indeed it is
>
> R2(config-map-class)#do sh traffic
>
> Interface Se0/1/0
> Access Target Byte Sustain Excess Interval Increment
> Adapt
> VC List Rate Limit bits/int bits/int (ms) (bytes)
> Active
> 205 768000 10000 80007 0 104 9984 -
>
>
> However, as soon as I cross the Bc boundary of 80007 and set it to 80008 my
> Tc is changed to what appears to be (Bc / CIR) / 2 !!! WTF?
>
> R2(config-map-class)#do sh traffic
>
> Interface Se0/1/0
> Access Target Byte Sustain Excess Interval Increment
> Adapt
> VC List Rate Limit bits/int bits/int (ms) (bytes)
> Active
> 205 768000 5000 80008 0 52 4992 -
>
> As you can see the Tc has been set to 52 ms which just so happens to be 1/2
> of the previous value of 104ms. Any clues?
>
>
>
>
>
> --
> Regards,
>
> Joe Astorino CCIE #24347 (R&S)
> Sr. Technical Instructor - IPexpert
> Mailto: jastorino_at_ipexpert.com
> Telephone: +1.810.326.1444
> Live Assistance, Please visit: www.ipexpert.com/chat
> eFax: +1.810.454.0130
>
> IPexpert is a premier provider of Classroom and Self-Study Cisco CCNA (R&S,
> Voice & Security), CCNP, CCVP, CCSP and CCIE (R&S, Voice, Security & Service
> Provider) Certification Training with locations throughout the United
> States, Europe and Australia. Be sure to check out our online communities at
> www.ipexpert.com/communities and our public website at www.ipexpert.com
>
>
>

-- 
Regards,
Joe Astorino CCIE #24347 (R&S)
Sr. Technical Instructor - IPexpert
Mailto: jastorino_at_ipexpert.com
Telephone: +1.810.326.1444
Live Assistance, Please visit: www.ipexpert.com/chat
eFax: +1.810.454.0130
IPexpert is a premier provider of Classroom and Self-Study Cisco CCNA (R&S,
Voice & Security), CCNP, CCVP, CCSP and CCIE (R&S, Voice, Security & Service
Provider) Certification Training with locations throughout the United
States, Europe and Australia. Be sure to check out our online communities at
www.ipexpert.com/communities and our public website at www.ipexpert.com
Blogs and organic groups at http://www.ccie.net