Traffic Shaping using Percentage

Percentage-based shaping provides flexibility by configuring bandwidth limits as a percentage of the available bandwidth rather than fixed values. This is not the physical interface bandwidth but the bandwidth you configured with the bandwidth command.

The advantage of using percentages is that the shaper scales automatically with the configured bandwidth. You can use a single policy-map for different interfaces. For example, let's say we have two interfaces:

  • Gigabit Interface
  • FastEthernet Interface

With a shaper that is configured to shape to 50%, it would shape to 500 Mbps on the Gigabit interface and 50 Mbps on the FastEthernet interface.

This way you don't have to configure multiple policy-maps for different interfaces.

https://networklessons.com/quality-of-service/qos-traffic-shaping-explained/