From: Ali Simaan (alisimaan@gmail.com)
Date: Fri Feb 27 2009 - 06:55:15 ARST
Hi All
I am confused about this CBWFQ logic.
In all Cisco QOS Documentation they state that when adjusting an interfaces
max-reserved bandwidth above 75% extreme caution is required to ensure that
one leaves enough remaining bandwidth to support best effort, control and
layer 2 overhead traffic. I understand that all unclassified traffic is
assigned to the class-default class. However is the control and layer 2
overhead traffic also assigned to the class-default class or does it sit
somewhere else?
If i configure a router as below and have reserved 100% of the interface
bandwidth and assigned class-default 25%, is the control and layer 2
overhead traffic actually still getting the same kind of service, or are
there risks with this configuration?
interface Serial0/0
bandwidth 128
ip address 131.1.12.1 255.255.255.0
max-reserved bandwidth 100
service policy output QOS
policy-map QOS
class 1
bandwith percent 75
class class-default
bandwidth percent 25
Also how would the cbwfq logic work if i had only assigned 20 percent to the
class-default class? Where would the other 5 % that is not assigned to any
class sit and what would be assigned to it?
Hope someone can shed some light on this.
Thanking you in advance
Ali
Blogs and organic groups at http://www.ccie.net
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