Per Session / per User shaping and queuing not working on 7206/7204 on 15.2

Question

Hello,
we are running the following scenario - to provide QoS (shaping/queueing) for our broadband (pppoe) users, we have configured several service-policies on our 7206/7204 BRAS-Routers. The service-policies are applied with RADIUS-Attributes when the pppoe-users dials in. The service-policies look like this
policy-map POL-BM-DEF-P_4m-DSCP-OUT
 description << Parent Policy 4 mbps >>
 class class-default
  shape average 3900000
  bandwidth 3900
   service-policy POL-BM-DEF-C_4m-DSCP-OUT
policy-map POL-BM-DEF-C_4m-DSCP-OUT
 description << Child Policy 4 mbps >>
 class CM-VO-DEF-DSCP
  priority 900
  police cir 900000
   conform-action transmit
   exceed-action drop
 class CM-VS-DEF-DSCP
  bandwidth 100
 class CM-ID-DEF-DSCP
  bandwidth 900
 class CM-MS-DEF-DSCP
  bandwidth 600
 class CM-MC-DEF-DSCP
  bandwidth 300
 class CM-NC-DEF-DSCP
  bandwidth 150
 class CM-NM-DEF-DSCP
  bandwidth 150
 class class-default
  bandwidth 800
We are applying the policies with the following Cisco-AV-Pair attribute
lcp:interface-config=service-policy output POL-BM-DEF-P_4m-DSCP-OUT
Until recently that did work pretty good when using software 12.2(33)SRC3. But it turned out that there is a bug in this software that causes that the policy is applied but not working correct sometimes. See bug CSCsv27825. Although that bug does not match the software we are using, the symptoms do. Basically the parent shaper is not working, so there is no backpressure, no need for qos to kick in ;-)
The recommendation was to upgrade to Version 15.2(4)M5. When downloading the image there was a recommendation on the website to use Version 15.2(4)M6 instead, because of some important bugfixes. So we installed that, system cmes back online, everything works - except the service-policies. they are not applied at all any more.
After doing some tests it turns out that
- Policies that shape are not applied. It does not matter if using the ip:sub-qos-policy-out=xxx or lcp:interface-config=service-policy output xxx attribute.
- Policies that police like the one here are applied
policy-map POL-POLICE-DEF-P_1M-DSCP-OUT
 class class-default
  police 1000000
We prefer the shaping way, because of the smoother handling of bursty traffic.
Any ideas/recommendations ? I've tbeen readign a litte bit on the internet - that problem is not new, but unfortunately no one has a solution :-(
Best regards
Carsten
Short update: as soon as some queuing configuration is present in the policy (parent and/or child) it is not applied. i tried to be extra clever and combine the "policer" parent policy with our child-policy which does priority queuing - not applied. Even the parent-policy alone with no child policy (just the shaper)  is not gettign applied.
Any ideas what to debug to get a reason why it is not working ?

Answer 1

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