From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Wed Nov 10 2004 - 13:16:10 GMT-3
Bc = CIR * Tc/1000 however there is a maximum Tc per CIR. As CIR goes
up Tc must go down. Byte Limit is simply Bc + Be expressed in bytes.
See the below output for more info.
Router(config-map-class)#frame-relay cir 640000
Router(config-map-class)#do show traffic-shape | exclude 10[2-5]
Interface Se0/0
Access Target Byte Sustain Excess Interval Increment
Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes)
Active
113 640000 10000 640000 0 125 10000 -
Router(config-map-class)#frame-relay cir 640008
Router(config-map-class)#do show traffic-shape | exclude 10[2-5]
Interface Se0/0
Access Target Byte Sustain Excess Interval Increment
Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes)
Active
113 640008 5040 640008 0 63 5040 -
Router(config-map-class)#frame-relay cir 1280000
Router(config-map-class)#do show traffic-shape | exclude 10[2-5]
Interface Se0/0
Access Target Byte Sustain Excess Interval Increment
Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes)
Active
113 1280000 10080 1280000 0 63 10080 -
Router(config-map-class)#frame-relay cir 1280008
Router(config-map-class)#do show traffic-shape | exclude 10[2-5]
Interface Se0/0
Access Target Byte Sustain Excess Interval Increment
Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes)
Active
113 1280008 5120 1280008 0 32 5120 -
Router(config-map-class)#frame-relay cir 2560000
Router(config-map-class)#do show traffic-shape | exclude 10[2-5]
Interface Se0/0
Access Target Byte Sustain Excess Interval Increment
Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes)
Active
113 2560000 10240 2560000 0 32 10240 -
Router(config-map-class)#frame-relay cir 2560008
Router(config-map-class)#do show traffic-shape | exclude 10[2-5]
Interface Se0/0
Access Target Byte Sustain Excess Interval Increment
Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes)
Active
113 2560008 5120 2560008 0 16 5120 -
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Georg Pauwen
> Sent: Wednesday, November 10, 2004 9:50 AM
> To: chalermchai.hoonpongsimanont@atosorigin.com;
ccielab@groupstudy.com
> Subject: RE: FR Traffic Shaping Tc
>
> Hello Chalermchai,
>
> for speeds below 650kbps, the Bc defaults to 1/8 of the configured
CIR.
> For
> speeds above 650kbps, the Bc defaults to 1/16 of the configured CIR.
> Check this link to a very excellent explanation from Internetwork
Experts
> (slide 7 talks about the various defaults for the Bc).
>
> http://www.internetworkexpert.com/resources/01700368.htm
>
> Regards,
>
> Georg
>
> >From: "Hoonpongsimanont, Chalermchai"
> ><chalermchai.hoonpongsimanont@atosorigin.com>
> >Reply-To: "Hoonpongsimanont, Chalermchai"
> ><chalermchai.hoonpongsimanont@atosorigin.com>
> >To: "'Group Study'" <ccielab@groupstudy.com>
> >Subject: FR Traffic Shaping Tc
> >Date: Wed, 10 Nov 2004 14:23:06 +0700
> >
> >Hi all,
> >
> >I am confused with Frame Relay Traffic Shaping Tc interval. I think
> router
> >will automatically calculate Tc from configured CIR and Bc by
> >
> >Bc = CIR * Tc
> >
> >This is not working as expected on my router.
> >
> >Rack1R5#show traffic-shape serial0/0.35
> >
> >Interface Se0/0.35
> > Access Target Byte Sustain Excess Interval
Increment
> >Adapt
> >VC List Rate Limit bits/int bits/int (ms) (bytes)
> >Active
> >503 768000 6048 96000 0 63 6048
-
> >
> >I configured target rate of 768000, Bc of 96000, therefore I expected
to
> >see
> >Tc of 96000/768000 = 1/8 second = 125 ms. But on my router, Tc is 64
ms.
> >
> >It's working fine on another subinterface.
> >
> >
> >Rack1R5#show traffic-shape serial0/0.54
> >
> >Interface Se0/0.54
> > Access Target Byte Sustain Excess Interval
Increment
> >Adapt
> >VC List Rate Limit bits/int bits/int (ms) (bytes)
> >Active
> >504 768000 960 7680 0 10 960
-
> >
> >Could this be a software bug? I'm using 12.2(15)T14.
> >Thanks in advance,
> >
> >Cheers,
> >David
> >
> >Here's configuration.
> >
> >!
> > class-map match-all voice
> > match dscp cs5
> >!
> >!
> > policy-map voice-go-first
> > class voice
> > priority 256
> > class class-default
> > fair-queue
> > policy-map mark-default
> > class class-default
> > set dscp cs1
> >!
> >!
> >interface Serial0/0
> > no ip address
> > encapsulation frame-relay
> > frame-relay traffic-shaping
> > no frame-relay inverse-arp
> >!
> >interface Serial0/0.35 point-to-point
> > ip address 163.1.35.5 255.255.255.0
> > ip router isis
> > isis circuit-type level-2-only
> > frame-relay interface-dlci 503
> > class R3R5
> >!
> >interface Serial0/0.54 point-to-point
> > ip address 163.1.54.5 255.255.255.0
> > ip router isis
> > ip pim dense-mode
> > backup interface BRI0/0
> > isis circuit-type level-2-only
> > frame-relay de-group 1 504
> > frame-relay interface-dlci 504
> > class R4R5
> >!
> >!
> >map-class frame-relay R4R5
> > frame-relay end-to-end keepalive mode request
> > frame-relay cir 768000
> > frame-relay bc 7680
> > frame-relay be 0
> > service-policy output voice-go-first
> > frame-relay fragment 960
> >!
> >map-class frame-relay R3R5
> > frame-relay cir 768000
> > frame-relay bc 96000
> > frame-relay be 0
> > service-policy input mark-default
> >
>
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