Modular QoS CLI 有以下三种形式： Class map—How you define what traffic you're interested in
Policy map—What you do to the traffic defined in a class map
Service policy—How you enable a policy map on an interface
定义Class Map The first step in using MQC is to build a class map. Not surPRisingly, you do this with the class-map command:
vxr12(config)#class-map ? Word class-map name match-all Logical-AND all matching statements under this classmap match-any Logical-OR all matching statements under this classmapm
The match-all and match-any keywords let you specify whether traffic matches this class, if it matches all the rules in this class or any of them, respectively. The default is match-all.
You create a class by giving it a name. This puts you in a submode called config-cmap:
vxr12(config)#class-map voice vxr12(config-cmap)#? QoS class-map configuration commands: description Class-Map description exit Exit from QoS class-map configuration mode match classification criteria no Negate or set default values of a command rename Rename this class-mapm
The most useful option under config-cmap is match, which lets you define the traffic you want to match with this class map. Its options are as follows:
vxr12(config-cmap)#match ? access-group Access group any Any packets class-map Class map cos IEEE 802.1Q/ISL class of service/user priority values destination-address Destination address fr-de Match on Frame-relay DE bit input-interface Select an input interface to match ip IP specific values mpls Multi Protocol Label Switching specific values not Negate this match result protocol Protocol qos-group Qos-group source-address Source addressm
举例 class-map match-all voice match mpls eXPerimental 5 policy-map llq class voice priority percent 30
This defines a class that matches any MPLS traffic that has the EXP bits set to 5 and then defines a policy for that traffic that gives the traffic 30 percent of a link's bandwidth. The policy map hasn't been enabled on an interface yet; you'll see that in a minute.
You can match multiple values with the same line using the following command sequence:
class-map match-any bronze-service match mpls experimental 0 1
This matches any packets that have an MPLS EXP of 0 or 1. As with route maps, multiple values specified within the same match clause (sUCh as match mpls experimental 0 1) are implicitly ORed together; a packet can't have both EXP 0 and EXP 1, so this implicit ORing makes sense.
You can also match more than one criteria within a class, and you can use the match-any and match-all statements to decide how you want to match traffic. For example, the following policy matches traffic that has MPLS EXP 5 or traffic that entered the router on interface POS3/0:
class-map match-any gold match mpls experimental 5 match input-interface POS3/0 The following policy matches any traffic that has MPLS EXP 5 and that came in on interface POS3/0:
class-map match-all gold match mpls experimental 5 match input-interface POS3/0
vxr12#show class-map Class Map match-all gold (id 2) Match mpls experimental 5 Match input-interface POS3/0
Class Map match-any class-default (id 0) Match any
Class Map match-all voice (id 3) Match mpls experimental 5 Policy Map After you define the class maps you want to match, you need to associate the class of traffic with a behavior. You create the behavior with the policy-map command, which, like class-map, puts you in a special submode:
vxr12(config)#policy-map ? WORD policy-map name
vxr12(config)#policy-map llq vxr12(config-pmap)#? QoS policy-map configuration commands: class policy criteria description Policy-Map description exit Exit from QoS policy-map configuration mode no Negate or set default values of a command rename Rename this policy-map Under the config-pmap submode, you specify the class you want to match. This puts you in the config-pmap-c submode:
vxr12(config)#policy-map llq vxr12(config-pmap)#class voice vxr12(config-pmap-c)#? QoS policy-map class configuration commands: bandwidth Bandwidth exit Exit from QoS class action configuration mode no Negate or set default values of a command police Police priority Strict Scheduling Priority for this Class queue-limit Queue Max Threshold for Tail Drop random-detect Enable Random Early Detection as drop policy service-policy Configure QoS Service Policy set Set QoS values shape Traffic Shaping
class-map match-any voice match mpls experimental 5 policy-map llq class voice priority percent 30
class-map match-all business match mpls experimental 3 4 class-map match-all voice match mpls experimental 5 policy-map business-and-voice class voice priority percent 30 class business bandwidth percent 60 class class-default bandwidth percent 10
Service Policy vxr12(config-if)#service-policy ? history Keep history of QoS metrics input Assign policy-map to the input of an interface output Assign policy-map to the output of an interface
vxr12(config-if)#service-policy out vxr12(config-if)#service-policy output ? WORD policy-map name
