Today I just wanted to write a little post about the scavenger class when configuring QoS on a switch. Your Quality of Service requirements will vary depending on the type of traffic you have traversing your network. In order to ensure that important data like phone calls are clear and not choppy it is important to rank the different types of traffic in your network.
When setting up your QoS policies you can configure your IP phones to get the highest priority, but the scavenger class is completely different and is used to configure traffic with the lowest possible priority! Basically what this means is that if the network is congested, traffic marked for the scavenger class will be slowed to a halt so that higher priority traffic can still make it through.
Traffic that is usually marked for the scavenger class is traffic from p2p file sharing applications, bit torrents, and video games. Any traffic that doesn’t go along with the companies main objectives should be assigned a lower priority.
This whole process of ranking different types of traffic is part of Class-Based Weighted Fair Queuing or CBWFQ for short.
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