QoS specifying reserved bandwidth for a class belonging to a policy-map

When implementing QoS, to specify the bandwidth allocated for a class belonging to a policy map, use the bandwidth command in policy-map class configuration mode. There are three ways in which to allocate bandwidth:

  • bandwidth specify a specific bandwidth in kbps. This delivers an absolute bandwidth value. The allowed values vary according to the interface and platform in use.
  • bandwidth percent specify an absolute percentage of the available bandwidth. This is a percentage of the interface bandwidth and is unchanging throughout the duration of the operation.
  • bandwidth remaining percent specify a percentage of the remaining bandwidth. This is a relative value which depends upon the max reserve bandwidth, which is 75% by default, and upon any unused bandwidth from other classes.