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frame relay map class qustion

can someone tell me the difference between bc, be, cir and eir - is bc=cir and be=eir?

  • Other Network Infrastructure Subjects
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Re: frame relay map class qustion

Hi Mary -

Sounds to me you are talking about Frame-Relay Taffic Shaping,

Here's some information on your question :

frame-relay bc

To specify the incoming or outgoing committed burst size (Bc) for a Frame Relay virtual circuit, use the frame-relay bc map-class configuration command. To reset the committed burst size to the default, use the no form of this command.

frame-relay bc {in | out} bits

no frame-relay bc {in | out} bits

frame-relay be

To set the incoming or outgoing excess burst size (Be) for a Frame Relay virtual circuit, use the frame-relay be map-class configuration command. To reset the excess burst size to the default, use the no form of this command.

frame-relay be {in | out} bits

no frame-relay be {in | out} bits

frame-relay cir

To specify the incoming or outgoing committed information rate (CIR) for a Frame Relay virtual circuit, use the frame-relay cir map-class configuration command. To reset the CIR to the default, use the no form of this command.

frame-relay cir {in | out} bps

no frame-relay cir {in | out} bps

Also, eir is excess information rate

..and you might find the following link useful too:

http://www.cisco.com/warp/public/125/21.shtml

Hope this helps - PS. Do you work for CW Global Ops UK ??

Re: frame relay map class qustion

cir - this can be considered as the rate thats agreed upon by the service provider, that you can send at. You will always get the cir, no matter, whatever be the network conditions. Thats the SLA between you and SP, related to CIR. Unit of CIR is in bits per second ( can be kbps also).

eir - this has a value greater than CIR, and is the rate to which you can burst (send data) above the CIR. This rate is not always guaranteed by the service provider. Again the unit is bits per second ( or kbps)

bc - this is measured in bytes, and is the number of bytes you can send in a specific time Interval T. This time interval is related to your CIR.

be- this is also measure in bytes, and is the number of extra bytes you can send (burst) in the same specific time interval T (mentioned above)

bc is not equal to CIR and be is not equal to EIR, its just that they are related.

bc = CIR / T. Where T is the Time interval in which you can send Bc bytes of data at a rate = CIR.

HTH

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