QoS to distribute available bandwidth to different customers

Hi all,

I have two different customers (from here: Cust1, Cust2) that pay and share the same contract with the ISP with a WAN Link of 20Mbps/20Mbps.

I have only 1 CPE (Cisco 1841):

• F0/1/0: WAN Interface
• F0/0: Cust1
• F0/1: Cust2

I would like to know if it's possibile to perform some QoS to accomplish the following:

• If Cust1 needs almost all BW while Cust2 does not need it --> give to him all possible BW
• Same as above but with Cust1 and Cust2 swapped
• If both Cust1 and Cust2 need a lot of BW, try to balance 20 Mbps BW in a fair way (e.g: 10Mbps and 10Mbps)

Consider that the minimum guaranteed BW is 2/2Mbps by contract.

I was thinking about class-maps, policy-maps and service-policy to apply under router configuration.

Here I paste the configuration I was thinking about.

For classification:

class-map match-all MATCH-CUST1-SUBNET
match access-group name ACL-MATCH-CUST1-SUBNET

class-map match-all MATCH-CUST2-SUBNET
match access-group name ACL-MATCH-CUST2-SUBNET

Policy:

policy-map PM-SHARED-BW
class MATCH-CUST1-SUBNET
bandwidth percent 45
class MATCH-CUST2-SUBNET
bandwidth percent 45

policy-map PM-BW-SHARED-20Mbps
class class-default
police 20000000 conform-action transmit exceed drop
service-policy PM-SHARED-BW

Interface configuration:
interface f0/0
service-policy output PM-BW-SHARED-20Mbps

interface f0/1
service-policy output PM-BW-SHARED-20Mbps

The problem with this configuration (from my lab tests) seems to be that policing of 20Mbps is being applied to both interface f0/0 AND f0/1.
So, this configuration, gives 20Mbps policing to int f0/0 and 20 Mbps to f0/1.

Is it correct?
I'm new to QoS mechanisms.

Is there a way to accomplish what I need?

Thanks!