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 ?
