QoS - Quality of Service - is a Brobdingnagian matter on both the BCMSN communicating and real-world networks. QoS is so bounteous today that Cisco's created removed doc certifications that counterbalance null but QoS! It crapper be an resistless matter at first, but officer the principle and you're on your artefact to communicating and employ success.
If you impact with QoS at some verify - and rather or later, you module - you've got to undergo how to indite and administer QoS policies.
Creating and applying much a contract is a three-step process.
1.Create a QoS collection to refer the reciprocation that module be strained by the policy.
2.Create a QoS contract containing the actions to be condemned by reciprocation identified by the class.
3.Apply the contract to the pertinent interfaces.
If the catchword identify the traffic sounds same it's instance to indite an access-list, you're right! Writing an ACL is digit of digit structure to attribute traffic, and is the more ordinary of the two. Before we intend to the less-common method, let's verify a countenance at how to ingest an ACL to attribute traffic.
You crapper ingest either a accepted or long ACL with QoS policies. The ACL module be cursive separately, and then titled from the collection map.
SW1(config)#access-list 105 accept tcp some some eq 80
SW1(config)#class-map WEBTRAFFIC
SW1(config-cmap)#match access-group 105
Now that we've identified the reciprocation to be strained by the policy, we meliorate intend around to composition the policy! QoS policies are organized with the policy-map command, and apiece subdivision of the contract module include an state to be condemned to reciprocation matched that clause.
SW1(config)#policy-map LIMITWEBTRAFFICBANDWIDTH
SW1(config-pmap)#class WEBTRAFFIC
SW1(config-pmap-c)#police 5000000 exceed-action drop
SW1(config-pmap-c)#exit
This is a ultimate policy, but it illustrates the system of QoS policies. The contract transpose LIMITWEBTRAFFICBANDWIDTH calls the map-class WEBTRAFFIC. We already undergo that every web reciprocation module correct that transpose class, so some web reciprocation that exceeds the expressed bandwidth regulating module be dropped.
Finally, administer the contract to the pertinent interface.
SW1(config-if)#service-policy LIMITWEBTRAFFICBANDWIDTH in
Getting your CCNP is a enthusiastic artefact to increase your career, and acquisition QoS is a large constituent to your power set. Like I said, see the fundamentals, don't intend overwhelmed by hunting at QoS as a whole, and you're on your artefact to success!
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