3com MSR 20-20 참조 매뉴얼

Use the undo cir command to restore the default value.

The CIR is the minimum sending rate that can be provided by virtual circuit. It 
ensures the user could still send data at this rate upon network congestion.

Upon network congestion, DCE will send a packet with a BECN flag bit of 1 to 
DTE. After DTE receives this packet, it gradually reduces the sending rate of virtual 
circuit from the allowed CIR (CIR ALLOW) to CIR. If DTE does not receive the 
packet with the BECN flag bit of 1 any more within a certain period of time, it will 
restore the sending rate of virtual circuit as CIR ALLOW.

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cbs, ebs, cir allow.

# Set the CIR of the FR class named test1 as 32000 bps.

<Sysname> system-view

[Sysname] fr class test1

[Sysname-fr-class-test1] cir 32000 

cir allow [ inbound | outbound ] committed-information-rate

undo cir allow [ inbound | outbound ]

Frame relay class view

inbound: Sets the CIR ALLOW of an inbound packet, valid only when FRTP is 
enabled on the interface.

outbound: Sets the CIR ALLOW of an outbound packet, valid only when FRTS is 
enabled on the interface.

committed-information-rate: CIR ALLOW, in bps, ranging from 1000 to 
45000000. It defaults to 56000 bps.

Use the cir allow command to set the CIR ALLOW of FR virtual circuit.

Use the undo cir allow command to restore the default value.

CIR ALLOW is the sending rate that can be normally provided by a FR network. 
When there is no congestion on the network, it ensures the user could send data 
at this rate.

If packet direction is not specified upon configuration, the parameter will be set in 
both inbound and outbound directions.

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