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Problem QoS DSCP Matching with PPPoE

Hello All,

Currently i have problem with QoS DSCP marking to work with PPPoE. 
I configured my Router as PPPoE Server with BBA group: 

Router1##show running-config | se bba
bba-group pppoe global
virtual-template 1

 

- I configured class-map match with IP DSCP AF13 and below is policy-map which customer got under established PPPoE with router: 
Router1# show policy-map interface vi2.501 output

Virtual-Access2.501

SSS session identifier 257 -

Service-policy output: vcbtest

Class-map: cl-dscptest (match-all)
0 packets, 0 bytes
30 second offered rate 0000 bps, drop rate 0000 bps
Match: dscp af13 (14)
police:
rate 51200000 bps, burst 9600000 bytes, peak-burst 19200000 bytes
conformed 0 packets, 0 bytes; actions:
transmit
exceeded 0 packets, 0 bytes; actions:
drop
violated 0 packets, 0 bytes; actions:
drop
conformed 0000 bps, exceeded 0000 bps, violated 0000 bps

Class-map: class-default (match-any)
49799 packets, 26905509 bytes
30 second offered rate 1000 bps, drop rate 0000 bps
Match: any
police:
rate 5120000 bps, burst 960000 bytes, peak-burst 1920000 bytes
conformed 48955 packets, 25638379 bytes; actions:
transmit
exceeded 844 packets, 1267130 bytes; actions:
drop
violated 0 packets, 0 bytes; actions:
drop
conformed 1000 bps, exceeded 0000 bps, violated 0000 bps


As u can see above, there is no match on class-dscptest. 
I confirmed again, the ingress traffic was marked correctly with dscp AF13, But when egress go through (PPPoE Session)interface virtual-access, traffic is not marked. 

I don't what is problem about QoS with PPPoE. I try to verified with other interface on same router that not configured pppoe, traffic is marked normal. 

IOS Version:  Cisco IOS Software, IOS-XE Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 15.3(1)S1, RELEASE SOFTWARE (fc1)

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