May 2011
Intermediate to advanced
788 pages
23h 34m
English
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QoS
QoS is covered in detail in Chapter 31, and it’s a topic that could easily fill an entire book. In this section, I will focus on some 3750-specific QoS features.
One of the useful features of the 3750 is support for AutoQoS, which makes certain assumptions about your network and configures the switch accordingly. While I’m not a fan of letting network devices assume anything, in this case, the assumptions are accurate most of the time. I have had no qualms about enabling AutoQoS on the 3750s I’ve installed in VoIP networks with hundreds of phones supported by Cisco Call Manager. The reason I’m OK with this is that Cisco’s assumptions are built around the idea that you’re using Call Manager, Cisco IP phones, and low-latency queuing on your network. Chances are, if you need QoS enabled on your switches, it’s because you’re implementing VoIP.
You can enable AutoQoS on an interface with the auto qos voip
command:
3750(config-if)#auto qos voip ?
cisco-phone Trust the QoS marking of Cisco IP Phone
cisco-softphone Trust the QoS marking of Cisco IP SoftPhone
trust Trust the DSCP/CoS markingThere are three options: cisco-phone, cisco-softphone, and trust. The first two are used for interfaces
connected to either hard- or softphones. When configured with these
options, the QoS values received in packets will be trusted only if
they’re sourced from Cisco IP phones. The trust option enables QoS while trusting all
packets’ QoS values.
If you’d like to see what AutoQoS does, enable AutoQoS debugging ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.