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QoS on ASR 920 failing when using ASR 920

MysticalTh0r
Level 1
Level 1

Hi all,

 

I have configured 2 two-level policy-maps on a ASR 920, and applied them one on inside and the other on outside direction. The policies work fine on traffic traversing the router but it doesn't with the self generated traffic on the device.

 

After some testing I've found out that when using the class-default on a policy-map, the router receiving the traffic (ping marking the ToS value) gets packets marked with theToS value different than the one applied when creating the ping; but it doesn't happen always (it keeps the value when the ToS are 160 or 224, being ip precedence 5 and 7)

 

The configuration on the policy-map output goes like this (the input policy matches on ACL and assings an ip precedence value)

 

class-map match-all management
match ip precedence 7
class-map match-all bulk
match ip precedence 1
class-map match-all real-time
match ip precedence 5
!
policy-map QoS_Out
class bulk
set cos 1
set ip dscp 9
bandwidth 499984
class management
bandwidth 16
set cos 7
class real-time
priority 1000
class class-default   <-------If this class is erased/not used, it works fine
set dscp default
set cos 0
bandwidth 18749
policy-map shaping
class class-default
shape average 525000000
service-policy QoS_Out

 

Can anyone confirm if this behaviour is a bug? If so, which one? (I haven't found any that fits).Does anyone have similar configuration and working (meaning different IOS being used)? I've tried with IOS-XE 3.16.5, 3.16.7 and 3.18.3

 

Thanks, best regards.

 

José Manuel Garrido.

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