
© 2012 Cisco and/or its affiliates. All rights reserved.
Presentation_ID
Cisco Public
© 2013 Cisco and/or its affiliates. All rights reserved.
BRKARC-3470 Cisco Public
45
Buffering, Queuing, and Scheduling
• Buffering – storing packets in memory
‒ Needed to absorb bursts, manage congestion
• Queuing – buffering packets according to traffic class
‒ Provides dedicated buffer for packets of different priority
• Scheduling – controlling the order of transmission of buffered packets
‒ Ensures preferential treatment for packets of higher priority and fair treatment for packets of
equal priority
• Nexus 7000 uses queuing policies and network-QoS policies to define buffering,
queuing, and scheduling behaviour
• Default queuing and network-QoS policies always in effect in absence of any user
configuration
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