query on quality of service

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May 31st, 2010
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Hi all,


I am using a cisco router 2800 to connect 3 sites. I would like to use quality of service(QOS) to certain traffic. I understand that QOS can be configured to guarantee bandwidth, but can it also restrict bandwidth such that it will not exceed the guaranteed bandwidth? Below is my config for QOS on sql traffic Thks in advance.


access-list 101 permit tcp 192.168.2.0 0.0.0.255 eq 1433 any
access-list 101 permit tcp 192.168.3.0 0.0.0.255 eq 1433 any


class-map match-all SQL
match access-group 101
!
!
policy-map RouterQOS
class SQL
  priority percent 50
  set ip precedence 1

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Ganesh Hariharan Mon, 05/31/2010 - 01:36
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Hi all,


I am using a cisco router 2800 to connect 3 sites. I would like to use quality of service(QOS) to certain traffic. I understand that QOS can be configured to guarantee bandwidth, but can it also restrict bandwidth such that it will not exceed the guaranteed bandwidth? Below is my config for QOS on sql traffic Thks in advance.


access-list 101 permit tcp 192.168.2.0 0.0.0.255 eq 1433 any
access-list 101 permit tcp 192.168.3.0 0.0.0.255 eq 1433 any


class-map match-all SQL
match access-group 101
!
!
policy-map RouterQOS
class SQL
  priority percent 50
  set ip precedence 1

Hi,


To give priority to a class of traffic belonging to a policy map and specifies that the amount of guaranteed bandwidth will be specified by the percent of available bandwidth.  Pirority percent configuration is done which allows you to set up classes based on a variety of criteria (not just User Datagram Ports (UDP) ports) and assign priority to them, and is available for use on serial interface.


When the device is not congested, the priority class traffic is allowed to exceed its allocated bandwidth. When the device is congested, the priority class traffic above the allocated bandwidth is discarded.


Hope to Help !!


Ganesh.H


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donnie Mon, 05/31/2010 - 19:58
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Hi Ganesh,


Thk you for the clarification. Hence is it possible to use QOS or any other methods such that the particular traffic does not exceed the allocated bandwidth? Thks in advance.

Ganesh Hariharan Tue, 06/01/2010 - 00:36
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Hi Ganesh,


Thk you for the clarification. Hence is it possible to use QOS or any other methods such that the particular traffic does not exceed the allocated bandwidth? Thks in advance.

Genarally this is one of the methods check out the below links for sample configuration of Qos in switches


http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a0080114326.shtml


Hope to Help !!


Ganesh.H


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