SMC Networks TigerAccess SMC7816M Manuel d'utilisateur télécharger pdf (Page 385)

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HAPTER

UALITY

ERVICE

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.

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SMC Networks TigerAccess SMC7816M Manuel d'utilisateur Page 385

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