Need help for QoS Design and Configuration for Campus LAN

[Dipesh Patel]

Dear Experts,

I have given a task to desgn and implement QOS for Campus Network.

Present Scenario : To understand the existing Topology, I have attached diagram with the devices Make and model.

On WAN in MPLS clound the QOS has been configured by MPLS Service Provider i.e.

COS1 : 20% of BW --- Voice

COS2 : 20% of BW --- Video

COS3 : 25% of BW --- SAP

COS4 : 35% of BW --- Default

Main Traffic in Network :

• IP Telephony : AVAYA CM 6.0 (Avaya Aura Technology)
  
• Video Conferencing : Polycom
  
• SAP / ERP Application
  
• SMTP/ MS Exchange Traffic
  
• Internet Traffic
  
• Microsoft-ds traffic
  
• CIFS traffic between Servers
  
• And other default Traffic
  

Problem : Voice and Video Clarity / Quality is not good.

Requirement : To implement QOS in LAN and WAN.

I have gone through the documentation regarding the implementation of QOS for LAN. But it's littla bit confusing.

There are several queries if you can solve, it will be a great help me to go ahead.

Queries :

• Should we go with Auto QOS or Manually configuration of QOS?
  
• If AutoQos (SRND v4) than On Access Layer Switch,
  
  • On Disctribution switch :
    
    • Which command I should apply on the Trunk Ports?
      
  • On CORE switch :
    
    • Which command I should apply on trunk ports and on ports connected to Router?
      
• In AutoQOS SRNDv4 I have seen 4 types of cmds are there where should I use? :
  
  • auto qos classify {police}
    
• Post Auto QOS configuration - How to Tune the same ?
  

• If no Auto QOS than how to configure QOS at Access layer / Distribution layer / CORE layer?
  

If you can provide the sample configuration according to the attached topology than it will be a great help for me.

In addition to this, After configuration of the QOS How can I monitor the QOS? Is there any Tool to monitor the same.

Waiting for the Replies from you all.

Thanks in Advance

Regards

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[Marwan ALshawi]

HI

based on the topology you provided see bellow the answers to your questions

• Should we go with Auto QOS or Manually configuration of QOS?
  

if you are not experienced with QoS it is better to start with auto QoS then you can adjust things if you want

• If AutoQos (SRND v4) than On Access Layer Switch,
  enable auto qos on Access switches
  

but what you need to know and check if the endpoints of your VOIP/Video are marking the traffic with the required cos/DSCP ? if yes then trust cos on the access port and trust DSCP n the uplinks

if not you need to mark using clas maps. ACLs and policy maps and apply it per access port to mark each traffic type with relevant TOS cos/DSCP for queuing over the LAN/WAN

• In AutoQOS SRNDv4 I have seen 4 types of cmds are there where should I use? :
  
  • auto qos classify {police}
    
• Post Auto QOS configuration - How to Tune the same ? you can change whatever you want by retyping no followed by the comand then typing the new comand
  

• If no Auto QOS than how to configure QOS at Access layer / Distribution layer / CORE layer? this will be hard if you dont have experience with Qos
  

have a look at the bellow link for configuring QoS on the WAN edge router

https://supportforums.cisco.com/docs/DOC-8373

and the bellow i think it is the best document ever about QoS just undestnad it and you will be fine

http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoSDesign.html

HTH

if helpful Rate

[Dipesh Patel]

Dear All,

The End points are : IP Phone - Avaya and VC device - Polycom.

Can you suggest the configuration ?

Regards,

[Marwan ALshawi]

you could use

Int fastethernet mod_num/< port number>

Switchport mode access

Switchport voice vlan x

Switchport access vlan y

Spanning-tree portfast

Power inline auto

Mls qos trust cos

if it dose not work try then the bellow one:

switchport mode trunk

switchport trunk encapsulation dot1q

switchport trunk native vlan [client data vlan]

switchport trunk allowed vlan 1,,

Mls qos trust cos

Spanning-tree portfast

but you need to assign vlan y manully to the phone if the phone dose not picked it up ( no CDP )

some usefull CSC discussions

https://supportforums.cisco.com/message/75708#75708

https://supportforums.cisco.com/message/540640#540640

HTH

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