Great you found the issue ...
heheh saves me time reading trough your first mail ;-)
-- Regards, Iwan Hoogendoorn CCIE #13084 (R&S / Security / SP) Sr. Support Engineer IPexpert, Inc. URL: http://www.IPexpert.com On Mon, Nov 30, 2009 at 10:13 AM, Joe Astorino <jastorino_at_ipexpert.com> wrote: > Hey Michael, thanks for your reply. I believe you found the magic ratio I > was searching for. I didn't think to look at the byte-count. Excellent!!! > At least now we know why. Sort of like how I also found a few months ago > the highest possible value you can make the Tc is 249ms even though some > docs say it maxes out at 125ms. > > This makes perfect sense now based on the byte count limit of 10000 bytes / > interval. > > 80007 bits / 8 = 10000.875 Bytes = 10000 Bytes rounded down > 80008 bits / 8 = 10001 Bytes exactly > > Nicely done sir! > > On Mon, Nov 30, 2009 at 4:00 AM, Michael McFarlin <router.genie_at_gmail.com>wrote: > >> Joe >> >> That's an interesting observation. I've never noticed this behavior before >> either. It looks like the maximum byte-limit is 10000. I'm guessing that >> when you give a Bc value that forces the byte-limit to over 10000 per >> interval, it recalculates the Bc as well as the Tc. I wonder what purpose >> this serves. >> >> --Here are the values I used in the map class >> >> map-class frame-relay FRTS >> frame-relay cir 1000000 >> frame-relay bc 125000 >> >> >> R2# sh traffic-shape >> >> Interface Se1/0 >> >> Access Target Byte Sustain Excess Interval Increment >> Adapt >> VC List Rate Limit bits/int bits/int (ms) (bytes) >> Active >> >> Interface Se1/0.23 >> >> Access Target Byte Sustain Excess Interval Increment >> Adapt >> VC List Rate Limit bits/int bits/int (ms) (bytes) >> Active >> 203 1000000 7875 125000 0 63 7875 - >> >> Notice that 7875*8 = 63000bits >> >> >> -Mike McFarlin >> router.genie_at_gmail.com >> >> >> >> On Mon, Nov 30, 2009 at 12:07 AM, Joe Astorino <jastorino_at_ipexpert.com>wrote: >> >>> 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 >>> >>> _______________________________________________________________________ >>> Subscription information may be found at: >>> http://www.groupstudy.com/list/CCIELab.html >>> >>> >>> >>> >>> >>> >>> >>> >> >> >> -- >> Mike McFarlin >> router.genie_at_gmail.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 > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html > > > > > > > > -- Regards, Iwan Hoogendoorn CCIE #13084 (R&S / Security / SP) Sr. Support Engineer IPexpert, Inc. URL: http://www.IPexpert.com Blogs and organic groups at http://www.ccie.netReceived on Mon Nov 30 2009 - 14:58:13 ART
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