Meter Configuration in F100 and F25

This article provides configuration guidelines for setting up parameters used in metering network traffic.

The meters in the Provider Connectivity Assurance Sensor F100 and Assurance Sensor F25 Packet Switch domain offer the following granularities for their token bucket algorithm. The meter configuration is segregated in six ranges (Rate Type).

Minimum CBS and EBS Configuration Guidelines

Committed Burst Size (CBS) x8 to Committed Information Rate (CIR) ratio must be at least 1 millisecond, as demonstrated in the following formula:

(CBSx8)/CIR >= 0.001

Excess Burst Size (EBS) x8 to Excess Information Rate (EIR) ratio must also be at least 1 millisecond:

(EBSx8)/EIR >= 0.001

The formulas above ensure that the burst size ratio (converted to bits by multiplying by 8) to the committed or excess rate is at least 1 millisecond. This requirement helps maintain network performance by ensuring that bursts of committed and excess traffic can be handled efficiently without causing excessive delay or congestion by the token bucket algorithm in this implementation.

In other words, these formulas ensure that the network can smoothly manage short bursts of both committed and excess data, maintaining a balance between allowing bursts and preventing network issues.

Example

CIR = 100000000 = 100 Mbps				
EIR = 200000000 = 200 Mbps				
Min CBS = CIR*0.001/8 =		12500	[bytes]	
Min EBS = EIR*0.001/8 =		25000	[bytes]	

In the example above, the recommended CBS value must be at least 12,500 bytes. This is the minimum committed burst size that should be configured to ensure efficient handling of committed traffic.

The initial CBS value can be multiplied by a factor of 2 (or 3) to accommodate larger bursts of data, resulting in a new CBS value of 25,000 bytes. This larger burst size allows the network to efficiently handle more significant bursts of committed traffic.

Similarly, the recommended EBS value must be at least 25,000 bytes. This is the minimum excess burst size that should be configured to ensure efficient handling of excess traffic.

The initial EBS value can also be multiplied by a factor of 2 (or 3) to accommodate larger bursts of data, resulting in a new EBS value of 50,000 bytes. This larger burst size allows the network to efficiently handle more significant bursts of excess traffic.