CIR and Access Rate
control
Member Posts: 309
in CCNA & CCENT
Reading up on frame relay and it talks about the above being different. I thought the cir and clock rate would be the same? Do they not determine the speed?
Comments
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DPG
Member Posts: 780 ■■■■■□□□□□
The access information rate (AIR) is the actual link speed. The committed information rate (CIR) is the amount of bandwidth guaranteed on that link. -
control
Member Posts: 309
The access information rate (AIR) is the actual link speed. The committed information rate (CIR) is the amount of bandwidth guaranteed on that link.
Ahhh, so the actual line could be a T1/E1 which would be the set via the clock rate, but the CIR could only be 256kpbs, depending on what's been purchased from the provider? -
TurK-FX
Member Posts: 174
as he mentioned, CIR is the lowest speed the customer will get. AIR might be higher then CIR if the traffic load is not heavy.WGU classes: Transferred -> AGC1, CLC1, TBP1, CJC1, BVC1, C278, CRV1, IWC1, IWT1, C246, C247, C132, C164, INC1, C277. Appealed -> WFV1 and C393.
What is Left to take - > EUP1, EUC1, C220, C221, BNC1, GC1, C299, CTV1, DJV1, DHV1, CUV1, CJV1, TPV1, C394
Currently Studying -> CCNA security (Designing Customized Security & Security) -
TurK-FX
Member Posts: 174
Ahhh, so the actual line could be a T1/E1 which would be the set via the clock rate, but the CIR could only be 256kpbs, depending on what's been purchased from the provider?
So if actual line is T1, the speed will be 1.544Mbit per second, but if traffic not heavy and there are available bandwich, you may get more than 1.544Mbit. But you will never get less than that.WGU classes: Transferred -> AGC1, CLC1, TBP1, CJC1, BVC1, C278, CRV1, IWC1, IWT1, C246, C247, C132, C164, INC1, C277. Appealed -> WFV1 and C393.
What is Left to take - > EUP1, EUC1, C220, C221, BNC1, GC1, C299, CTV1, DJV1, DHV1, CUV1, CJV1, TPV1, C394
Currently Studying -> CCNA security (Designing Customized Security & Security) -
lantech
Member Posts: 329
T1 might be a bad example. I've never heard of a T1 going faster than 1.544Mbits. But it might happen.
At the place I used to work at most companies would contract for 20MB/S internet connections. That would be the CIR (Commited Information Rate). But the connections we gave them could actually handle 100MB/S. The customer would be guaranteed that 20MB/S rate but they could always go faster than that for a period of time as long as bandwidth of other customers allowed. Then at that point they may or may not be charged for going over the 20MB/S. If it happened to often then they would be forced to upgrade their bandwidth to a higher amount.2012 Certification Goals
CCENT: 04/16/2012
CCNA: TBD -
control
Member Posts: 309
T1 might be a bad example. I've never heard of a T1 going faster than 1.544Mbits. But it might happen.
At the place I used to work at most companies would contract for 20MB/S internet connections. That would be the CIR (Commited Information Rate). But the connections we gave them could actually handle 100MB/S. The customer would be guaranteed that 20MB/S rate but they could always go faster than that for a period of time as long as bandwidth of other customers allowed. Then at that point they may or may not be charged for going over the 20MB/S. If it happened to often then they would be forced to upgrade their bandwidth to a higher amount.
Thanks for that explanation. In this case would the access rate be 100MB/S? And the CIR 20MB/S? -
TurK-FX
Member Posts: 174
Thanks for that explanation. In this case would the access rate be 100MB/S? And the CIR 20MB/S?
Exactly!!!WGU classes: Transferred -> AGC1, CLC1, TBP1, CJC1, BVC1, C278, CRV1, IWC1, IWT1, C246, C247, C132, C164, INC1, C277. Appealed -> WFV1 and C393.
What is Left to take - > EUP1, EUC1, C220, C221, BNC1, GC1, C299, CTV1, DJV1, DHV1, CUV1, CJV1, TPV1, C394
Currently Studying -> CCNA security (Designing Customized Security & Security)
