1. Implementing Quality of Service (QoS)
The MQC

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Module 3
Overview
Implementation
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Overview of Class Maps
Class Maps
Consist of a case sensitive name; a series of match commands; a match-all or match-any instruction (default is match-all)
Class maps can nest inside of other class maps
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Configuration
Syntax
router(config)# class-map [match-all | match-any] cmap_name
router(config-cmap)# match condition
router(config-cmap)# match not condition
router(config-cmap)# match class-map cmap_name
router(config-cmap)# match any
router(config-cmap)# description my_description
Example
R1(config)# class-map match-all CM_SAMPLE
R1(config-cmap)# match protocol ip
R1(config-cmap)# match qos-group 3
R1(config-cmap)# match access-group 110
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Configuration, con’t
Nesting Example
R1(config)# class-map match-all CM_SAMPLE_CHILD
R1(config-cmap)# match protocol ip
R1(config-cmap)# match qos-group 3
R1(config-cmap)# exit
R1(config)# class-map match-any CM_SAMPLE_PARENT
R1(config-cmap)# match class-map CM_SAMPLE_CHILD
R1(config-cmap)# match input-interface FastEthernet 0/1
Verification
show class-map [class_name] [ | {begin | exclude | include } exp ]
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6. The class-default Class
Automatically created by the IOS
Catch-all class – matches all traffic that does not fall under one of your class-maps
We configure (if we need to) under the policy-map
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7. Overview of Policy Maps
What do we do to the traffic in the class maps?
Once again, a case-sensitive name; traffic class(es); the policy or policies
Up to 256 classes can be in a single policy map
Policy maps can be nested
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Configuration
Syntax
router(config)# policy-map policy_map_name
router(config-pmap)# class {class-name | class-default}
router(config-pmap-c)#
Example
R1(config)# class-map CM_SAMPLE1
R1(config-cmap)# match access-group 110
R1(config-cmap)# class-map CM_SAMPLE2
R1(config-cmap)# match access-group 112
R1(config-cmap)# !
R1(config-cmap)# policy-map PM_TEST
R1(config-pmap)# class CM_SAMPLE1
R1(config-pmap-c)# bandwidth 100
R1(config-pmap-c)# class SM_SAMPLE2
R1(config-pmap-c)# bandwidth 200
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9. Nesting in Policy-Maps
Nesting Policy Maps (Hierarchical)
Example – shape all traffic to 3 MB; inside that 3 MB, guarantee Web traffic at least 1 MB
We use a service-policy (normally done with interfaces) to assign policy inside policy-map
Restrictions
set command not supported on the child policy
priority command can be used in either the parent or the child policy, but not both
fair-queue command cannot be used in the parent
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Nesting Example
class-map CM_ALL_TRAFFIC
match any !
class-map CM_WEB
match protocol http
policy-map PM_CHILD
class CM_WEB
bandwidth 1000
policy-map PM_PARENT
class CM_ALL_TRAFFIC
shape
service-policy PM_CHILD
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Verification
show policy-map
show policy-map interface int_name
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The Service Policy
Where to apply the QoS policy
Syntax
router(config-if)# service-policy {input | output} pm_name
Example
R1(config-if)# service-policy output PM_TEST
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