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QoS Shaping Subinterface

This may not even be possible but figured I'd ping a few other brains. We are in the process of setting multiple sub-interfaces out to branch offices off our own transport. Part of this is providing them committed sub-rate interface speeds. Easy enough with an MQC shaping policy. However here's the gotcha we'd like if other sub-interfaces on the PHY aren't in use to allow the site to burst. I'm wondering if this kind of dynamic sharper is possible.


policy-map Ring-Traffic
class Voice
priority percent 30
class Signal
priority percent 5
class class-default
random-detect
!
policy-map Shape-DATX
class class-default
bandwidth 60000
shape average 60000000
service-policy Ring-Traffic
!
policy-map Shape-CRCO
class class-default
bandwidth 20000
shape average 20000000
service-policy Ring-Traffic
!
interface GigabitEthernet3/0/1
no ip address
speed auto
duplex auto
negotiation auto
!
interface GigabitEthernet3/0/1.39
description CRCO
encapsulation dot1Q 39
ip address 10.39.39.1 255.255.255.252
service-policy output Shape-CRCO
!
interface GigabitEthernet3/0/1.40
description DATX
encapsulation dot1Q 40
ip address 10.40.40.1 255.255.255.252
service-policy output Shape-DATX



So in the above example if Gi3/0/1.40 had zero traffic Gi3/0/1.39 should be able to take all of it's 60Mbps. Basically dynamic load sharing. Not sure if this is even possible with QoS MQC. Curious as to others thoughts.

Thanks.

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