Sadly AT&T is using 802.1p instead of DSCP marking. 802.1p marking is carried in the ethernet frame (VLAN tag) and in the IP header. This means that the switch has to set the 802.1p priority correctly.
The 802.1p priorities are 0-7. Aruba switches are have 8 queues by default. The default Aruba switch 802.1p to queue is.
802.1p Queue Priorities
----- ----------
1 1
2 2
3 0
4 3
5 4
6 5
7 6
8 7
At the switches you can configure the amount of bandwidth per queue using the following command
interface x bandwidth-min output <q1> <q2> etc
The values are in percentage.
However, there is still one question. How are you classifing and marking the traffic so it's having the correct DSCP and/or 802.1p value? You can write some qos policies for this if that is needed.
Simple example
class ipv4 "example"
10 match ip 1.1.1.1 0.0.0.0 2.2.2.2 0.0.0.0
exit
policy qos "example"
10 class ipv4 "example" action rate-limit kbps 4000 action ip-precedence 4 action priority 3
exit
interface 1
service-policy "example" in
exit
Note that remarking only is possible inbound and not outbound.
But maybe it's not needed to classify the traffic because marking is already done