Calling the child-policy under parent-policy-QoS

[andags]

Hi Team,

This is with respect to QoS configurations on DMVPN headend router.

Noticed that the child policy is configured but not called under the parent-policy. Will there be any errors or service impact when correct the configurations?

Current Config:

policy-map 10M-qos
class class-default
shape average 10000000

Required Config:

policy-map 10M-qos
class class-default

shaping 10000000
service-policy wanoutput

Child Polciy:

policy-map wanoutput
class real-time
priority percent 33 32500
class routing
bandwidth percent 4
class interactive
bandwidth percent 25
set ip dscp af32
class voice-signal
bandwidth percent 4
class email
bandwidth percent 4
random-detect

[Joseph W. Doherty · Accepted solution]

NB: As you didn't note your device or its IOS package, can only address your question very generally.

Usually, changing a QoS policy on an active interface goes unnoticed.  I.e. there might be a very brief hit to some in-flight packets, but most applications are not (too) adversely impacted.  That said, when possible, always better to make such changes during a scheduled maintenance window, or at the least, during non-busy or non-critical usage times.

BTW, about your policies, I would suggest defining class-default, in your wanoutput policy, with a defined amount of bandwidth.  I also suggest not using WRED unless you're a QoS expert.  Lastly, I suggest using FQ, at least in class-default, and perhaps in other non-LLQ classes too (if supported).  With FQ, in class-default, you may find your need for other defined classes is reduced.  Except for your "interactive" class, assigning AF32, you could possible allow all the other non-LLQ classes to just use class-default (again if FQ enabled for that class).

[andags]

Thanks for the input.