Installation manual

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CLI – The following example globally enables DSCP Priority service on the switch, maps
DSCP value 0 to CoS value 1 (on port 1), and then displays the DSCP Priority settings.
* Mapping specific values for IP DSCP is implemented as an interface configuration command, but
any changes will apply to the all interfaces on the switch.
Quality of Service
The commands described in this section are used to configure Quality of Service (QoS)
classification criteria and service policies. Differentiated Services (DiffServ) provides
policy-based management mechanisms used for prioritizing network resources to meet
the requirements of specific traffic types on a per hop basis. Each packet is classified
upon entry into the network based on access lists, IP Precedence, DSCP values, or
VLAN lists. Using access lists allows you select traffic based on Layer 2, Layer 3, or Layer
4 information contained in each packet. Based on configured network policies, different
kinds of traffic can be marked for different kinds of forwarding.
All switches or routers that access the Internet rely on class information to provide the
same forwarding treatment to packets in the same class. Class information can be
assigned by end hosts, or switches or routers along the path. Priority can then be
assigned based on a general policy, or a detailed examination of the packet. However,
note that detailed examination of packets should take place close to the network edge so
that core switches and routers are not overloaded.
Switches and routers along the path can use class information to prioritize the resources
allocated to different traffic classes. The manner in which an individual device handles
traffic in the DiffServ architecture is called per-hop behavior. All devices along a path
should be configured in a consistent manner to construct a consistent end-to-end QoS
solution.
Notes: 1.
You can configure up to 16 rules per Class Map. You can also include multiple
classes in a Policy Map.
Console(config)#map ip dscp 4-301
Console(config)#interface ethernet 1/1 4-186
Console(config-if)#map ip dscp 1 cos 0 4-301
Console(config-if)#end
Console#show map ip dscp ethernet 1/1 4-302
DSCP mapping status: disabled
Port DSCP COS
--------- ---- ---
Eth 1/ 1 0 0
Eth 1/ 1 1 0
Eth 1/ 1 2 0
Eth 1/ 1 3 0
.
.
.
Eth 1/ 1 61 0
Eth 1/ 1 62 0
Eth 1/ 1 63 0
Console#