how do I set the time interval for FRTS?

Answered Question

I need to set FRTS with a cir of 128k but I need to lower the time interval to the minimum, I think is 150ms, any help plese?

Correct Answer by jbrenesj about 7 years 8 months ago

10ms is the smallest interval. the default is 150ms.


Bc = Tc * cir


Just don't use the command for tc under the map-class because that's not the way to set a specific interval.

Use the formula and then configure the cir and the Bc

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Edison Ortiz Tue, 08/18/2009 - 17:18
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The lowest time interval is 10ms and you can achieve it with the following formula:


Tc = Bc / CIR


map-class frame-relay FRTS

frame-relay cir 128000

frame-relay bc 1280


This will provide a 10ms Tc.


HTH,


__


Edison.



Jerry Ye Tue, 08/18/2009 - 17:19
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Hi Joseph,


The lowest Tc is 10ms. When you are configuring map-class for FRTS, the router will calculate Tc when you configured the CIR and Bc. You can use this formular to calculate Bc


CIR = Bc / Tc , where Tc is in second

Tc = 10/1000 = 0.01

128000 = Bc / 0.01

Bc = 128000 x 0.01 = 1280


map-class frame-relay FRTS

frame-relay cir 128000

frame-relay bc 1280


interface Serial0/0/0.203 point-to-point

ip address x.x.x.x 255.255.255.0

frame-relay interface-dlci 203

class FRTS

interface Serial0/0/0

no ip address

encapsulation frame-relay

frame-relay traffic-shaping


sh traffic-shape

...snip...

Interface Se0/0/0.203

Access Target Byte Sustain Excess Interval Increment Adapt

VC List Rate Limit bits/int bits/int (ms) (bytes) Active

203 128000 160 1280 0 10 160 -


HTH,

jerry

Correct Answer
jbrenesj Tue, 08/18/2009 - 17:24
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10ms is the smallest interval. the default is 150ms.


Bc = Tc * cir


Just don't use the command for tc under the map-class because that's not the way to set a specific interval.

Use the formula and then configure the cir and the Bc

Jerry Ye Tue, 08/18/2009 - 17:33
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BTW, default CIR is not 150ms, it is 125ms or 1/8 second.


Regards,

jerry

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