Quality of Service (QoS): Managing Bandwidth More Effectively
Preparation for Configuring QoS
2.Select the QoS option you want to use. Table
QoS Options for Prioritizing Outbound Traffic | QoS Classifiers |
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| Precedence | DiffServ | |
Option 1: | Prioritize traffic by sending specific packet | Yes1 | Yes | Yes |
Configure80 | types (determined by QoS classifier) to |
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2.1p Priority | different outbound port queues on the |
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Rules Only | switch. |
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| Rely on |
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| priority as an 802.1p value to downstream |
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| devices. |
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Option 2: | Prioritize traffic by sending specific packet | No | Yes | Yes |
Configure | types (determined by QoS classifier) to |
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ToS DSCP | different outbound port queues on the |
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Policies | switch. |
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with 802.1p | Propagate a service policy by reconfiguring |
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Priorities | the DSCP in outbound IP packets according |
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to packet type. The packet is placed in an outbound port queue according to the 802.1p priority configured for that DSCP policy. (The policy assumes that downstream devices can be configured to recognize the DSCP in IP packets and implement the service policy it indicates.)
Use
1In this mode the configuration is fixed. You cannot change the automatic priority assignment when using
3.If you want 802.1p priority settings to be included in outbound packets, ensure that tagged VLANs are configured on the appropriate downstream links.
4.Determine the actual QoS configuration changes you will need to make on each