Bandwidth sharing

[jonathan johnson]

Hello,

We have a requirement where we'd like to have a pool of bandwidth that can be dynamically shared between two sub-interfaces on a router.  For example, if we have a customer with two WAN links that aggregate back to the same router (on our side) we'd like to allocate the customer 50Mb that can be shared between the two services.  If the two interfaces try to use in excess of the 50Mb then the traffic is shaped (preferred) or policed.

Can anyone suggest how this could be achieved other than putting the two interfaces into a VRF and limiting an inbounf data feed to the VRF?

Thanks,

Jono

[Ganesh Hariharan]

Hello Jono,

You can enable shaping on an interface (or sub-interface) in three easy steps. Check out the below example format by creating step by step appraoch.

class-map match-any CLASS_Test
 match any  In this case, we are going to assign all traffic to the CLASS_Test class.
Policy
policy-map POLICY_Test
 class CLASS_Test
  shape average 8000000

In this case, we're going to take any traffic that matched the CLASS_Test class ( With all traffic) and apply a shaping policy to it. As an example We use the shape average 8000000 configuration command to limit our speed (the CIR) to 8 Mbps. 

Another configuration command available for a policy map is bandwidth, which has a similar effect. Unfortunately, a policy map utilizing the bandwidth configuration command can not be applied to a sub-interface.

Now apply the configuration on interface 
interface GigabitEthernet0/3.429
encapsulation dot1Q 429
service-policy output POLICY_Test

With above matching based on ACL for IP subnet we can define the bandiwdth policing based on our requirement.

Hope it Helps..

-GI

Rate if it Helps...

[jonathan johnson]

Thanks Ganesh,

I already do quote a lot of shaping on individual sub-interfaces - my question was if a 'pool' of ip bandwidth could be allocated (shared) to a number of sub-interfaces.

Thanks,

Jono

[Joseph W. Doherty]

Are there only two subintefaces, or are there more than two subinterfaces but you only want to share 50 Mbps between two?

[jonathan johnson]

Hi Joseph,

Yes, there are just two sub-interfaces that need to share the 50Mb.

Thanks,

Jono

[Joseph W. Doherty]

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Posting

Then you might only need to shape at the main interface for 50 Mbps.