qos on fast ethernet link for less than 100Mb of bandwidth

[P_Tone ATG]

If I have a policy setup similar to what's below how do I tell the router that traffic should be shaped to say 30Mbps while still keeping priority for the traffic classes?

policy-map VoipPolicy
  class VoipMap
    priority percent 50
  class SubVoipMap
    bandwidth percent 25
  class class-default
    set dscp default
    fair-queue
    random-detect

I'm doing this on a 3845

[Joseph W. Doherty]

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policy-map Shape30

class class-default

shape average 30000000

service-policy VoipPolicy

Apply Shape30 policy to egress of your FE.

BTW, believe the above doesn't account for L2 overhead, so if your 30 Mbps is "wire" bandwidth, you'll want to shape slower.  15% less usually works pretty well.