QoS policing/shaping

luke_bibby

Fellow TE'ers,

I have a 2811 router which has a 10Mbps connection to the net. I also have 3 customers which connect into the router and I would like to:

• ensure that each customer gets a minimum bandwidth of 3Mbps
• reserve 1Mbps of bandwidth which is not available to any of the customers
• allow each customer to use any available bandwidth (the 9Mbps) if the other customers are not using their full 3Mbps. (ie. if customer 1 is only using 1Mbps, customer 2 is using 1Mbps, allow customer 3 to use up to 7Mbps for this particular time)

I have read lots of doco and bought myself hte QoS book from Odom but I am still unsure of how I can acheive this. Do I want to police or shape?

Using MQC, I have created the three classes to match the different customers:

R(config)# class-map match-all CUST1_CMAP
R(config-cmap)# match access-group 1
R(config)# class-map match-all CUST2_CMAP
R(config-cmap)# match access-group 2
R(config)# class-map match-all CUST3_CMAP
R(config-cmap)# match access-group 3

If I was policing, would the following command under each customer's policy-map work?:
police cir percent 30 pir percent 90 conform transmit exceed transmit violate drop

Any help would be greatly appreciated

burbankmarc

You want to police on the ingress, and shape on the egress, so if this is incoming traffic then you will police it.

And what your doing isn't the way i'd do it. I would police the circuit to your 10Mbps then just use CBWFQ to ensure that each customer gets at least 3mbps and leave 1Mbps for your class-default.

So it'd look like this:

policy-map police
class class-default
police 10000000 conform-action transmit exceed-action drop
service-policy customers

policy-map customers
class CUST1_CMAP
bandwidth 3000
class CUST2_CMAP
bandwidth 3000
class CUST2_CMAP
bandwidth 3000 
class class-default
bandwidth 1000
fair-queue

That sets the circuit 10Mbps and no more. It also ensures that every customer will get at least 3Mbps and can use more bandwidth if it's available. Also, depending on if you're using voice you may need to tweak the policing section.