Chapter 5. Congestion-Management Tools

This chapter includes the following topics:

  • Scheduling and queuing

  • Legacy Layer 3 mechanisms

  • Currently recommended Layer 3 mechanisms

  • Layer 2 queuing tools

  • Tx-ring

  • PAK_priority

Of all the mechanisms within the QoS toolset, congestion-management tools provide the most significant impact on application service levels. Congestion-management tools, also known as queuing tools, apply to interfaces that may experience congestion. This could be the case in either a WAN or a LAN environment (although LAN queuing tools are discussed in Chapter 10, “Catalyst QoS Tools”) because speed mismatches can occur in either setting. Whenever packets enter a device faster than they can exit it, the potential for congestion exists and ...

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