car (QoS profile view)
Function
The car command configures traffic policing in a QoS profile.
The undo car command deletes the traffic policing configuration from the QoS profile.
By default, traffic policing is not configured in a QoS profile.
Format
car cir cir-value [ pir pir-value ] [ cbs cbs-value pbs pbs-value ] { inbound | outbound }
undo car { inbound | outbound }
Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this command.
The S5720-EI does not support inbound traffic policing. When the device configured with inbound traffic policing is upgraded from an earlier version (earlier than V200R007), the inbound traffic policing configuration fails to be restored.
The S6720-EI and S6720S-EI do not support inbound traffic policing.
Parameters
Parameter |
Description |
Value |
|---|---|---|
cir cir-value |
Specifies the committed information rate (CIR), which is the guaranteed average transmission rate. |
The value is an integer that ranges from 64 to 4294967295, in kbit/s. |
| pir pir-value | Specifies the peak information rate (PIR), which is the maximum rate of traffic that can pass through an interface. |
The value is an integer that ranges from 64 to 4294967295, in kbit/s. The PIR must be greater than or equal to the CIR. The default PIR is equal to the CIR. |
cbs cbs-value |
Specifies the committed burst size (CBS), which is the average volume of burst traffic that can pass through an interface. |
The value is an integer that ranges from 4000 to 4294967295, in bytes. If the PIR is not set, the default CBS is 188 times the CIR. If the PIR is set, the default CBS is 125 times the CIR. |
pbs pbs-value |
Specifies the peak burst size (PBS), which is the maximum volume of burst traffic that can pass through an interface. |
The value is an integer that ranges from 4000 to 4294967295, in bytes. If the PIR is not set, the default PBS is 313 times the CIR. If the PIR is set, the default PBS is 125 times the PIR. |
inbound |
Indicates inbound traffic policing. |
- |
outbound |
Indicates outbound traffic policing. |
- |
Usage Guidelines
Usage Scenario
Traffic policing discards excess traffic to limit traffic within a proper range and to protect network resources.
The car command configures traffic policing in a QoS profile.
Follow-up Procedure
Apply the QoS profile in the AAA domain view.
Precautions
When the traffic policing rate is larger than the maximum bandwidth of an interface, traffic policing does not take effect on the interface. Set the CIR and PIR to be smaller than the rate of an interface.
When the CBS is smaller than the number of bytes in a packet, the device directly discards the packet.