Policing - Cisco CRS-1 - Carrier Routing System Router Migration Manual

Chapter 3 Cisco CRS-3 Carrier Routing System Router Command Changes
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Policing

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Minimum bandwidth of a group must be equal to or greater than the sum of queue minimum
bandwidths and the police rates of the high priority classes under the group. If the configured value
does not meet these requirements, the minimum group bandwidth is automatically increased to
satisfy the requirements.
Oversubscription of minimum bandwidth is permitted. In the event of oversubscription, the actual
minimum bandwidth that a group or queue receives is proportional to its configured value.
Smallest step size supported is 8 kbps for 10 gigabit interfaces and 64 kbps for 100 gigabit interfaces
for queues and groups. Step size increases with the rate value. Rounding error does not exceed 0.4
per cent or 8 kbps, whichever is higher.
524,288 policers (dual token bucket) are supported.
8,192 unique policer parameters (CIR, CBS, PIR, PBS) or profiles are supported. Multiple policers
can share a single profile.
Police rates can be configured in the range of 8 Kbps - 134 Gbps.
Smallest granularity supported is 8 kbps (for rates up to 8 Mbps). The step size is higher for higher
rates but is never greater than 0.2% of the rate value. For very high ratios of PIR/CIR the rounding
error can be greater than 0.2%.
The maximum permitted burst size is 2 MB for rates up to 131 Mbps, and 100 ms for higher rates.
Burst granularity
For rates that are less than or equal to 131 Mbps, burst granularity varies from 128 bytes to
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16,000 bytes in proportion to the burst value. The worst case step-size is 1.6% of burst value.
– For rates greater than 131 Mbps, the granularity is 1 ms (with the corresponding rate as
reference).
Cisco CRS-1 Carrier Routing System to Cisco CRS-3 Carrier Routing System Migration Guide
QoS Features Changes
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