What is the Difference Between Flat QOS and H-QOS

[Ibrahim Jamil]

Hello Freinds What is the Difference Between Flat QOS and H-QOS thanks

[Giuseppe Larosa]

Hello Ibrahim,

I have never heard the term Flat QoS before.

However, if for flat QoS we can mean normal QoS you have a single policy-map applied per direction on the interface with multiple user defined traffic classes and a class class-default.

H-QoS refers to the usage of nested policies you can have a parent policy-map that invokes child policies within a class.

As explained in a previous post the most typical example of HQoS is the use of a parent shaper that invokes a child policy that is CBWFQ or LLQ.

This is done to create a sub rate virtual pipe

policy PARENT-SHAPER

class class-default

shape average 20000000

policy CHILD

policy CHILD

class Voice

priority percent 20

class APP

bandwidith percent 20

class class-default

bandwidth percent 1

fair-queue

!

With new HQF class default needs to have at least 1 percent of bandwidth left to it.

For the CHILD policy used in this way the reference bandwidth is 20 Mbps that is the setting of the shaper in the PARENT policy.

Hope to help

Giuseppe

[Ibrahim Jamil]

Hello Giuseppe

thanks for ur Always Support

Bro , Flat QOS is term usualy used in Mobile Operator such H-QOS towards UNI

aka eNB while Flat QOS towards NNI aka Agg

thanks

[Georg Pauwen]

Hello,

in short, in flat QoS, all classes are created at the same level, whereas in hierarchical QoS, you can have child and parent classes, which allows for more complex policies...

[Ibrahim Jamil]

Hello George

thanks for ur reply

can u pls explain  bit more about Flat QOS

Thanks