Egress priority queuing is enabled per interface on the 3750 with the "priority-queue out" command. The operation of this command is dependent on other configuration such as mapping COS/DSCP values to egress queues, etc. Take a look at the QoS SRND below. Specifically, see the section Campus QoS Design -> Catalyst 2970/3560/3750 - QoS Considerations and Design.
You do not need to reserve a specific bandwidth on the 3750. Congestion does not usually occur on high speed ports such as those on a switch. Congestion normally occurs on slower speed serial links such as WAN links which is why you would need to reserve bandwidth on these links. Priority queuing on the switch simply makes sure that higher priority packets are sent out before lower priority packets.
In fact, this is a WAN link (10 M but between 2 different sites) and we have a distributed cluster (Publisher is in one site and Subscriber in the other one). That?s why I want to reserve bandwith to guarantee the Intra-cluster traffic is not going to suffer
Actually as bbuffin said, it not surprise at all that 3750 does not supports priority. Unlike the router, it doesn't have a general use memory where to queue and buffer packets. There are per-port queues, but these work in a different way that the router, due to the complications of doing L3 switching in hardware.
So all you have to do (and still is mostly optional) is to configure dscp trust or set, and let auto-qos do the rest. Your voice frames hwill be transmitted before any other non-voice in the (rare) case they arrive at the switch simultaneously.
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...