Hierarchical QoS !

From: Doan Dung Chi (dungchid@gmail.com)
Date: Fri Jul 18 2008 - 07:19:08 ART

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Hi GS !

Please explain what is the deference btw 2 ways of QoS Configuration :

Method 1:

class-map match-all PRE2
match ip precedence 2
class-map match-all PRE3
match ip precedence 3
!
policy-map PARENT
class PRE2
shape average 512000
service-policy CHILD-PRE2
class PRE3
  shape average 1024000
  service-policy CHILD-PRE3
!
policy-map CHILD-PRE2
class class-default
  bandwidth 256
policy-map CHILD-PRE3
class class-default
  bandwidth 512
!
interface serial 1/0
service-policy output PARENT

Method 2:

class-map match-all PRE2
match ip precedence 2
class-map match-all PRE3
match ip precedence 3
!
policy-map PARENT
class PRE2
shape average 512000
bandwidth 256
class PRE3
shape average 1024000
bandwidth 512
!

interface serial 1/0
service-policy output PARENT

In my understand, Interface will allocate bandwidth of 256kbps for Class PRE2
& 512kbpp for Class PRE3 when congestion occur in Method 1. However, In Method
2, I don't understand how Interface process queue.
Correct me if I am wrong !

Thanks

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