[c-nsp] Subrate speed on GigE requiring QoS / Policer configuration

[Benjamin Lovell]

You have to use a hierarchical policy to create congestion at the desired BW. Parent policy creates congestion at desired point and then child policy classifies and queues under congestion.

See pseudo config example.

class-map EF
match EF
class-map AF
match AF
class-map NC
match NC

policy-map child
class EF
priority 2M
class AF
bandwidth 2M
class NC
bandwidth 500K

policy-map parent
class-default
shape average 15M
policy-map child policy


interface GE
service-policy parent


-Ben


On Oct 5, 2010, at 10:49 PM, Chris Evans wrote:

> I'm struggling to come up with a solution for my requirement.. Essentially
> we are building a lab using GRE to link two sites over our enterprise
> network. As this is a lab we want to limit the bandwidth that comes out of
> the LAB to 15megabits, but using GigE for the physical connection on an
> asr1k. Essentially my first thought was implement a policer on the egress
> interface limiting the maximum aggregate traffic to 15Mb, then qos scheduler
> on the tunnel interface or egress GigE. I need to prioritize certain traffic
> leaving the lab so I also want to use a scheduler to make sure that the
> voice traffic has priority and has a 2Mb of traffic for example.
> 
> I want to limit my EF traffic to 2Mb, AF to 2Mb, NC to 500Kb and best effort
> to 10.5Mb under signs of congestion within that 15Mb CIR. My challenge is
> that QoS only kicks in under signs of congestion, how would you allow the
> dynamic bandwidth allocation when the egress interface is really a GigE?
> 
> Anyone have a good configuration that would fit my needs?
> 
> Thanks
> 
> Chris
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