CCNA Routing and Switching ICND2 200-105 Official Cert Guide, Academic Edition (Lesly Time's Library) by Wendell Odom

Author:Wendell Odom
Language: eng
Format: epub
Publisher: Cisco Press

Of all these components of the queuing system, the scheduler can be the most interesting part, because it can perform prioritization. Prioritization (yet another term from the exam topics) refers to the concept of giving priority to one queue over another in some way.

Round Robin Scheduling (Prioritization)

One scheduling algorithm used by Cisco routers and switches uses round robin logic. In its most basic form, round robin cycles through the queues in order, taking turns with each queue. In each cycle, the scheduler either takes one message or takes a number of bytes from each queue by taking enough messages to total that number of bytes. Take some messages from queue 1, move on and take some from queue 2, then take some from queue 3, and so on, starting back at queue 1 after finishing a complete pass through the queues.

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