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Main Components of MQC

10/30/2011 By Andrew Roderos Leave a Comment

There are three main components that make up the MQC (Modular QoS CLI) and are listed below:

  • class-map – This is used as a classification filter defined within the policy map to identify traffic for preferential or deferential treatment. Traffic can be identified by IPP or DSCP, named or numbered ACL, Network-Based Application Recognition (NBAR), Layer 2 parameters (CoS, FR DE, ATM cell loss priority [CLP], MPLS Experimental [EXP] value), or combination of all of these.
  • policy-map – This is used as a statement that defines how each traffic type, as identified by the class map(s), should be serviced. Options include marking/re-marking, policing, shaping, low-latency or class-based weighted fair queuing, selective dropping, and header compression.
  • service-policy – This is used as a statement that binds the policy to an interface and specifies direction

For example:

ip access-list extended VOICE-RTP
 permit udp 192.168.1.0 0.0.0.255 any range 16384 32767
ip access-list extended VOICE-SIGNALING
 permit tcp 192.168.1.0 0.0.0.255 any range 2000 2002
!
class-map match-all VOICE-SIGNALING
 match access-group name VOICE-SIGNALING
class-map match-all VOICE-RTP
 match access-group name VOICE-RTP
!
policy-map VOICE
 class VOICE-RTP
 set dscp ef
 class VOICE-SIGNALING
 set dscp cs3
!
interface Vlan10
 description Voice VLAN
 service-policy input VOICE
!
end

References

Cisco QoS Exam Certification Guide (IP Telephony Self-Study) (2nd Edition)
End-to-End QoS Network Design: Quality of Service in LANs, WANs, and VPNs

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Filed Under: QoS Tagged With: Cisco, IOS

About Andrew Roderos

I am a network security engineer with a passion for networking and security. Follow me on Twitter, LinkedIn, and Instagram.

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