Netgear Switch M4100 Uživatelský manuál stáhnout pdf (Strana 201)

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Chapter 12. DiffServ | 201

ProSafe M4100 and M7100 Managed Switches

• Class. A class consists of a set of rules that identify which packets belong to the class.

Inbound traffic is separated into traffic classes based on Layer 3 and Layer 4 header data

and the VLAN ID, and marked with a corresponding DSCP value. One type of class is

supported: All, which specifies that every match criterion defined for the class must be

true for a match to occur.

• Policy. Defines the QoS attributes for one or more traf

fic classes. An example of an

attribute is the ability to mark a packet at ingress. The 7000 Series Managed Switch

supports a traffic conditions policy. This type of policy is associated with an inbound traffic

class and specifies the actions to be performed on packets meeting the class rules:

- Marking the packet with a given DSCP code point, IP precedence, or CoS

- Policing packets by dropping or re-marking those that exceed the class’

s assigned

data rate

- Counting the traf

fic within the class

• Service.

Assigns a policy to an interface for inbound traffic.

DiffServ

This example shows how a network administrator can provide equal access to the Internet

(or other external network) to different departments within a company. Each of four

departments has its own Class B subnet that is allocated 25 percent of the available

bandwidth on the port accessing the Internet.

Internet

Port 1/0/5

Outbound

Layer 3 Switch

Port 1/0/1

Port 1/0/4

Port 1/0/2

Port 1/0/3

VLAN 10:

Finance

VLAN 20:

Marketing

VLAN 30:

Test

VLAN 40:

Development

Figure 22. Class B subnet with differentiated services

The example is shown as CLI commands and as a Web interface procedure.

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