Cat 6840-X traffic shaping

[aferguson1209]

Looking for some validation / assistance should the following be incorrect. 

The goal is to implement egress traffic shaping on the 6840 platform, while maintaining a priority queue for voice (and ideally video) data. This hardware should support a 2P6Q4T structure, and shaping is "supported" on the datasheet. 

below config shows what I have used to try and achieve that....however, if i do an iperf test, using UDP traffic at a rate greater than the shape rate (say 125Mbit), voice and video quality becomes very bad on the receiving end. The priority traffic seems to be getting dropped when the interface is oversubscribed. The other end of the call remains good quality. 

The iperf client is on another port, sending the traffic to the iperf server behind the shaped port. Thus, the traffic should be subject to the shaping policy. As well, there is a phone behind the port, having a telepresence enabled call with another phone upstream. 

The port the policy is applied to is a trunk port to a gigabit layer 2 switch, DSCP trust is enabled on access ports and trunk port of that switch. 6840 trusts DSCP by default. 

Class-maps:

class-map type lan-queuing match-all VOICE-2P6Q4T-PQ1

 match dscp ef

class-map type lan-queuing match-all VIDEO-2P6Q4T-PQ2

 match dscp cs4  af41  af42  af43  cs5

class-map type lan-queuing match-all TRANS_DATA-2P6Q4T-QUEUE

 match dscp af21  af22  af23

class-map type lan-queuing match-all SCAVENGER-2P6Q4T-QUEUE

 match dscp cs1  

class-map type lan-queuing match-all BULK_DATA-2P6Q4T-QUEUE

 match dscp af11  af12  af13

class-map type lan-queuing match-all CONTROL-2P6Q4T-QUEUE

 match dscp cs2  cs3  cs6  cs7

class-map type lan-queuing match-all MM_STREAM-2P6Q4T-QUEUE

 match dscp af31  af32  af33

Policy-maps

1. policy-map type lan-queuing QUEUING-2P6Q4T
2.  class type lan-queuing VOICE-2P6Q4T-PQ1
3.     priority level 1
4.  class type lan-queuing VIDEO-2P6Q4T-PQ2
5.     priority level 2
6.  class type lan-queuing CONTROL-2P6Q4T-QUEUE
7.     bandwidth remaining percent 10
8.  class type lan-queuing MM_STREAM-2P6Q4T-QUEUE
9.     bandwidth remaining percent 20
10.      random-detect dscp-based
11.      random-detect dscp 26 percent 80 100
12.      random-detect dscp 28 percent 70 100
13.      random-detect dscp 30 percent 60 100
14.  class type lan-queuing TRANS_DATA-2P6Q4T-QUEUE
15.     bandwidth remaining percent 20
16.      random-detect dscp-based
17.      random-detect dscp 18 percent 80 100
18.      random-detect dscp 20 percent 70 100
19.      random-detect dscp 22 percent 60 100
20.  class type lan-queuing BULK_DATA-2P6Q4T-QUEUE
21.     bandwidth remaining percent 14
22.      random-detect dscp-based
23.      random-detect dscp 10 percent 80 100
24.      random-detect dscp 12 percent 70 100
25.      random-detect dscp 14 percent 60 100
26.  class type lan-queuing SCAVENGER-2P6Q4T-QUEUE
27.     bandwidth remaining percent 1
28.  class class-default
29.      random-detect dscp-based
30.      random-detect dscp 0 percent 80 100
31. policy-map type lan-queuing SHAPING-2P6Q4T
32.  class class-default
33.     shape average 100000000
34.    service-policy QUEUING-2P6Q4T
36. interface TenGigabitEthernet1/2
37.  switchport
38.  switchport trunk native vlan 12
39.  switchport mode trunk
40.  switchport trunk allowed vlan 1,12,16
41.  service-policy type lan-queuing output SHAPING-2P6Q4T