Planning a QoS Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15 Prioritizing and Monitoring QoS Configuration Options . . . . . . 6-15 Policy Enforcement Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15 QoS Resource Usage and Monitoring . . . . . . . . . . . . . . . . . . . . . . 6-15 Planning and Monitoring Rule Usage . . . . . . . . . . . . . . . . . . . . . . 6-16 Managing QoS Resource Consumption . . . . . . . . . . . . . . . . . . . . . 6-16 Troubleshooting a Shortage of Rule Resources . . . . . . . . . . . . . . 6-17 Examples of QoS Resource Usage . . . . . . . . . . . . . . . . . . . . . . . . . 6-18

Using QoS Classifiers To Configure QoS for Outbound Traffic . . . . . . . . 6-20

Viewing the QoS Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20 No Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21

QoS UDP/TCP Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21 Assigning 802.1p Priority Based on TCP or UDP Port Number . 6-22 Assigning a DSCP Policy Based on TCP or UDP Port Number . 6-24

QoS IP-Device Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-28 Assigning a Priority Based on IP Address . . . . . . . . . . . . . . . . . . . 6-29 Assigning a DSCP Policy Based on IP Address . . . . . . . . . . . . . . 6-30

QoS IP Type-of-Service (ToS) Policy and Priority . . . . . . . . . . . . . . . 6-34 Assigning an 802.1p Priority to IPv4 Packets on the Basis

of the ToS Precedence Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-35 Assigning an 802.1p Priority to IPv4 Packets on the Basis

of Incoming DSCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-36 Assigning a DSCP Policy on the Basis of the DSCP

in IPv4 Packets Received from Upstream Devices . . . . . . . . . . . 6-40 Details of QoS IP Type-of-Service . . . . . . . . . . . . . . . . . . . . . . . . .6-43

QoS VLAN-ID (VID) Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-46 Assigning a Priority Based on VLAN-ID . . . . . . . . . . . . . . . . . . . .6-46 Assigning a DSCP Policy Based on VLAN-ID (VID) . . . . . . . . . . . 6-48

QoS Source-Port Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-52 Assigning a Priority Based on Source-Port . . . . . . . . . . . . . . . . . .6-52 Assigning a DSCP Policy Based on the Source-Port . . . . . . . . . .6-54 Steps for Creating a Policy Based on Source-Port Classifiers . . 6-54

Differentiated Services Codepoint (DSCP) Mapping . . . . . . . . . . . . . 6-58

Default Priority Settings for Selected Codepoints . . . . . . . . . . . . 6-59

Quickly Listing Non-Default Codepoint Settings . . . . . . . . . . . . . 6-60

Effect of “No-override” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-61

Note On Changing a Priority Setting . . . . . . . . . . . . . . . . . . . . . . . . . . .

6-61

Example of Changing the Priority Setting on a Policy When

 

One or More Classifiers Are Currently Using the Policy . . . . . .

6-62

IP Multicast (IGMP) Interaction with QoS . . . . . . . . . . . . . . . . . . . . . . . . . 6-65

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