Configure QOS on Cisco Router – Basic for Voice

These are the basic steps:

1. Build ACL List
   router (config)#ip access-list extended 100
   router (config-ext-nacl)#permit ip hohost x.x.x.x host x.x.x.x
2. Build Class-Map
   router (config)#class-map match-any MapName-Voice
   router (config-cmap)#match access-group 100
   router (config-cmap)#match dscp
3. Build Policy-Map
   router (config)#policy-map QOS
   router (config-pmap)#class MapName-Voice
   router (config-pmap-c)#priority 2000
   router (cofnig-pmap-c)#set ip dscp ef
4.  Assign to Interface (Assign)
   router (config-if)#service-policy output QOS

To commands Monitor/Troubleshoot QOS issues:
show policy-maps int Fastethernet x
Show access-list ACLname
** be concerend with packet that are being dropped from the packet. usually indicates that priority level is not set high enough. Don’t be too concerend with packets that are being dropped from the default policy. Computer transfer communication are more forgiving that voice.

Cisco’s implemenation of Quality of Service Policies with DSCP http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a00800949f2.shtml

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