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CCIE Routing and Switching v5.0 Official Cert Guide: Classification and Marking

  • Sample Chapter is provided courtesy of Cisco Press.
  • Date: Dec 16, 2014.

Chapter Description

This chapter from CCIE Routing and Switching v5.0 Official Cert Guide, Volume 2, 5th Edition covers the following subtopics from the Cisco CCIE Routing and Switching written exam blueprint: Modular QoS CLI (MQC), Network-Based Application Recognition (NBAR), QoS Classification, QoS Marking, and Cisco AutoQoS.

Foundation Summary

This section lists additional details and facts to round out the coverage of the topics in this chapter. Unlike most of the Cisco Press Exam Certification Guides, this “Foundation Summary” does not repeat information presented in the “Foundation Topics” section of the chapter. Please take the time to read and study the details in the “Foundation Topics” section of the chapter, as well as review items noted with a Key Topic icon.

Table 3-12 lists the various match commands that can be used for MQC tools like CB Marking.

Table 3-12 match Configuration Command Reference for MQC Tools



match [ ip ] precedence precedence-value [precedence-value precedence-value precedence-value]

Matches precedence in IPv4 packets when the ip parameter is included; matches IPv4 and IPv6 packets when the ip parameter is missing.

match access-group { access-group | name access-group-name }

Matches an ACL by number or name.

match any

Matches all packets.

match class-map class-map-name

Matches based on another class map.

match cos cos-value [ cos-value cos-value cos-value ]

Matches a CoS value.

match destination-address mac address

Matches a destination MAC address.

match fr-dlci dlci-number

Matches a particular Frame Relay DLCI.

match input-interface interface-name

Matches an ingress interface.

match ip dscp [ip-dscp-value ip-dscp- value ip-dscp-value ip-dscp-value ip-dscp-value ip- dscp-value ip-dscp-value]

Matches DSCP in IPv4 packets when the ip parameter is included; matches IPv4 and IPv6 packets when the ip parameter is missing.

match ip rtp starting-port-number portrange

Matches the RTP’s UDP port-number range, even values only.

match mpls experimental number

Matches an MPLS Experimental value.

match mpls experimental topmost value

When multiple labels are in use, matches the MPLS EXP field in the topmost label.

match not match-criteria

Reverses the matching logic. In other words, things matched by the matching criteria do not match the class map.

match packet length { max maximumlength-value [min minimum-lengthvalue ] | min minimum-length-value [ max maximum-length-value]}

Matches packets based on the minimum length, maximum length, or both.

match protocol citrix app applicationname-string

Matches NBAR Citrix applications.

match protocol http [ url url-string | host hostname- string | mime MIME-type ]

Matches a host name, URL string, or MIME type.

match protocol protocol-name

Matches NBAR protocol types.

match protocol rtp [ audio | video | payloadtype payload-string ]

Matches RTP audio or video payload, based on the payload type. Also allows explicitly specifying payload types.

match qos-group qos-group-value

Matches a QoS group.

match source-address mac addressdestination

Matches a source MAC address.

Table 3-13 lists AutoQoS and QoS verification commands.

Table 3-13 AutoQoS and QoS Verification Commands



auto qos voip { cisco-phone | ciscosoftphone }

Enables AutoQoS VoIP on a switch access interface

auto qos voip trust

Enables AutoQoS VoIP on a switch uplink interface

auto qos voip [ trust ]

Enables AutoQoS VoIP on a router interface

auto discovery qos [ trust ]

Enables NBAR traffic discovery for AutoQoS Enterprise

auto qos

Enables AutoQoS Enterprise on an interface

show auto qos

Displays the interface AutoQoS commands

show mls qos

Displays queueing and COS/DSCP mappings

show policy-map interface

Displays the interface queuing actions caused by the policy map

show auto discovery qos

Displays the traffic collected by NBAR

show auto qos

Displays the configuration generated by the AutoQoS macro

Table 3-14 lists the RFCs related to DiffServ.

Table 3-14 DiffServ RFCs





Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers

Contains the details of the 6-bit DSCP field in an IP header


An Architecture for Differentiated Service

The core DiffServ conceptual document


Assured Forwarding PHB Group

Defines a set of 12 DSCP values and a convention for their use


An Expedited Forwarding PHB

Defines a single DSCP value as a convention for use as a low-latency class


New Terminology and Clarifications for DiffServ

Clarifies, but does not supersede, existing DiffServ RFCs

Memory Builders

The CCIE Routing and Switching written exam, like all Cisco CCIE written exams, covers a fairly broad set of topics. This section provides some basic tools to help you exercise your memory about some of the broader topics covered in this chapter.

Fill In Key Tables from Memory

Appendix E, “Key Tables for CCIE Study,” on the CD in the back of this book, contains empty sets of some of the key summary tables in each chapter. Print Appendix E, refer to this chapter’s tables in it, and fill in the tables from memory. Refer to Appendix F, “Solutions for Key Tables for CCIE Study,” on the CD, to check your answers.


Next, take a few moments to write down the definitions for the following terms:

  • IP Precedence
  • ToS byte
  • Differentiated Services
  • DS field
  • Per-Hop Behavior
  • Assured Forwarding
  • Expedited Forwarding
  • Class Selector
  • Class of Service
  • Differentiated Services Code Point
  • User Priority
  • Discard Eligible
  • Cell Loss Priority
  • MPLS Experimental bits
  • class map
  • policy map
  • service policy
  • Modular QoS CLI
  • Class-Based Marking
  • Network-Based Application Recognition
  • QoS preclassification
  • AutoQoS

Refer to the glossary to check your answers.

Further Reading

Cisco QoS Exam Certification Guide, by Wendell Odom and Michael Cavanaugh

End-to-End QoS Network Design, by Tim Szigeti and Christina Hattingh

“The Enterprise QoS SRND Guide,” posted at www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoS-SRND-Book.html, provides great background and details for real-life QoS deployments.

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