When it comes time to talk about queue-sets on the 3560, I find a LOT more research is needed than I expected. Check out the following blog from INE.com to better understand how QoS configuration changed between the 3550 and 3560. It has an excellent section which explains how queue-sets are just a buffer space partitioning scheme for the switch.
http://blog.ine.com/2008/03/03/bridging-the-gap-between-3550-and-3560-qos-part-i/
That URL plus some research on the Cisco website for 3560 QoS configuration helped me understand how queue-sets work.
http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.1_19_ea1/configuration/guide/swqos.html#wp1163863
The upshot is that by having two queue-sets available, you can provision two different QoS egress architectures on a single 3560. This will let you customize thresholds and buffer allocation for two groups of ports. However, an interesting side note is that DSCP and CoS mapping to queues remains global for all ports. This means the queue-sets are being utilized only to address different port speeds on the switch.
http://blog.ine.com/2008/03/03/bridging-the-gap-between-3550-and-3560-qos-part-i/
That URL plus some research on the Cisco website for 3560 QoS configuration helped me understand how queue-sets work.
http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.1_19_ea1/configuration/guide/swqos.html#wp1163863
The upshot is that by having two queue-sets available, you can provision two different QoS egress architectures on a single 3560. This will let you customize thresholds and buffer allocation for two groups of ports. However, an interesting side note is that DSCP and CoS mapping to queues remains global for all ports. This means the queue-sets are being utilized only to address different port speeds on the switch.
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