If memory serves, the 'switchport voice vlan' command does nothing without the 'switchport trunk encapsulation dot1q' command. I beleive Example 1 above only supports a data connection and not an IP phone. Not that a phone would not work on that port, but it would be on the data vlan, rather than the voice vlan and not take advantage of QoS features.
Of course, the 3550 changes some commands. I know that Example 2 is correct for a 3524. However, the 3550 may default to dot1q encapsulation, so Example 1 could be prefectly valid for a 3550.
Well, which one you use depends on what you are doing. Seeing as how you have an IP phone with a PC connected to it, the second one is the one to go with. You have to configure the port to be a dot1q trunk on the 3500s to do multivlan connections to the IP Phones - which will allow phones to grab the voice vlan and PCs or other end devices plugged into the switch port on the phone to grab the access vlan.
The mls qos trus cos command can be a little scary in some scenarios, so you might want to stay away from that one. What this command essentially says is that you will trust the cos settings from the end device connected to the phone. If you have a user who knows what they are doing or an application on the rampage, you could end up having some end device shooting out packets with a cos level higher than that of the phones, which could certainly wreak havoc on your voice quality.
The other command, switchport pri extend cos 0 means that beyond the phone, you will mark all traffic with a cos value of 0. Cos values of 0 are a) the default and b) the lowest priority.
I'm doing something similar to example 1 without the "mls qos trust cos" statement and it seems to work just fine. I have also done it the way of example 2.
switchport access vlan 2
switchport mode access
switchport voice vlan 22
The phone indicates it's operating on vlan 22 and I have network access on my PC so I assume it's working on vlan 2 as it should be. I also use a dhcp-helper statement on vlan 22 and my dhcp server for the phones is on vlan 2 while my call manager (on an ics-7750) is on vlan 1
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
answer. Be sure to read the whole thing or e...
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 ...
This document describe how DST changes and how time changes are
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setting the clocks forward 1 hour from standard time during the summer
months, and back again in the fall, in order to make b...