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Cisco® Field Manual: Catalyst® Switch Configuration by Steve McQuerry, Dave Hucaby

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13-2. QoS Configuration

  • QoS operations and policies can be applied as follows:

    - Port-based— All data passing through a specific port. This is usually used on a switch with a Layer 3 switching engine.
    - VLAN-based— All data passing through a specific VLAN on the switch. This is usually used on a switch with a Layer 2 switching engine or when QoS policies are common for all traffic on a VLAN.
  • Classification can be performed at ingress switch ports. Inbound CoS, IP precedence, or DSCP values can be trusted by accepting the values that were assigned by an attached device. This is acceptable when the source of the values is known and under administrative control. If these values cannot be trusted as they enter a switch, they can be mapped to new values. ...

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