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Limiting or Dedicating Bandwidth to specific services

I have a network that consists of the following:
Cisco 2851 -> Cisco PIX 515e -> Cisco 3550 (3), Cisco 3560 POE (1) clustered

We have 3 T1's into the facility, the first is for VOIP, the other two are for data.
We purchased one of the T1's specifically for a particular customer's project (we are a software dev co. that utilize large amounts of streaming video at any given time.
Right now, I would describe it as a first come first serve take as much as you can get setup.
We have several web servers for outside customers/ users as well as remote users utilizing access to our LAN via VPN. The servers hosting web pages are our Webmail, HelpDesk, TimeKeeping, etc...
My question is how do I dedicate 1.5 meg to the server/vlan that is directly "dedicated" to a specific customer. All of my servers set on one switch that is trunked to my 3560 and then out.
Also, the 3560 POE is the switch that all of my Cisco 7961's are connected to and each local user is connected through the phone, etc...

Where do I start to dedicate or impliment some type of QoS?
1 Solution
If you have your two T1s bundled the best thing to do is to use MQC and creat a class map for the customer and then specify the amout of bandwidth you want to guarantee and then apply the policy to the interface. Make sure your bandwidth is correct on your interface.  Here is an example

access-list 1 permit <PUBLIC IP OF CUSTOMER>
class-map match-all CUSTOMERX
 match access-group 1
policy-map CUSTOMERX
  bandwidth percent 50
interface Multilink 1
 bandwidth 3000
 service-policy output CUSTOMERX

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