Cisco Systems DOC-7814982

26-22

Catalyst 2950 Desktop Switch Software Configuration Guide

78-14982-01

Chapt er 26 Conf i gurin g QoS

Configuring QoS

Beginning in privileged EX EC mode , follow these steps t o create a po licy map:

Command Purpose

Step 1 configure terminal Enter g lo bal c onfigurat ion m ode.

Step 2 access-list access-list-number permit

{source source-wildcard | host source |

any}

access-list access-list-number

{perm it | remark} protocol

{source source-wildcard | host source |

any} [operator port] {destination

destination-wildcard | host destination |

any} [operator port] [dscp dscp-value]

[time-range time-range-name]

mac access-list extended name

permit {any | host source MAC address}

{any | host destination MAC address}

[aarp | amber | appletalk |dec-spanning |

decnet-iv | diagnostic | dsm | etype-6000 |

etyp e-804 2 | lat | lavc-sca | mop-console |

mop-dump | msdos | mumps | netbios |

vines-echo |vines-ip | xns-idp]

Create an IP standard or extended ACL for IP traff ic or a Layer 2 MAC

ACL for non-IP traffic, repeating the command as many times as

necessary.

For more inf orma tion, see t he “Classifying Traffic by Using ACLs”

section on p age 26- 16.

Note Deny statements are not supported for QoS ACLs. See the

“Classification Based on QoS ACLs” section on page 26-5 for

more details.

For more inf orm a tio n o n th e m ac a cc es s-l is t ex te nd ed nam e

command, see the “Creating Named MAC Extended A CLs ” secti on on

page 25-18.

Step 3 policy-map policy-map-name Cr eat e a po licy m ap by e nte ring t he p ol icy ma p na me , an d e nte r

policy-map configuration mode.

By defau lt, no p oli cy maps ar e de fined.

The default behavior of a policy map is to set the DSCP to 0 if the

pack et is an IP packet a nd to se t the CoS to 0 if the pac ket is ta gged. No

policing i s performe d.

Step 4 class class-map-name [access-group name

acl-index-or-name]Def ine a traf fic classif ication, an d enter poli cy-map cla ss conf iguration

mode.

By defau lt, no pol icy ma p cl ass m ap s a re defined.

If a traf fic class has already been de fined by using the class-map global

configuration c om mand, sp eci fy i ts nam e fo r class-map-name in this

command.

For access- group name acl-index-or-name, specify th e number or name

of the ACL created in Step 2.

Note In a policy map, the class named class-de fault is not supported.

The switch does not filter traffic based on the policy map

defined by t he cl ass class-default pol icy-ma p con figurat ion

command.