Bedienungsanleitung Netgear GC110P (Seite 394 von 416) (Englisch)

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Configuration Examples

394

Insight Managed 8-Port Gigabit Ethernet Smart Cloud Switch with 2 SFP Fiber Ports

4. On the IP Rules page (see Configure Rules for a Basic IP ACL on page 303), create a

second rule for IP ACL 1 with the following settings:

• Sequence Number. 2

• Action. Permit

• Match Every. True

5. Click the Add button.

6. On the IP Binding Configuration page (see Configure IP ACL Interface Bindings on

page 323), assign ACL ID 1 to the interface Gigabit ports 2, 3, and 4, and assign a

sequence number of 1.

By default, this IP ACL is bound on the inbound direction, so it examines traffic as it

enters the switch.

7. Click the Apply button.

8. Use the IP Binding Table page to view the interfaces and IP ACL binding information. (See

View or Delete IP ACL Bindings in the IP ACL Binding Table on page 325)

The IP ACL in this example matches all packets with the source IP address and subnet mask

of the Finance department’s network and deny it on the Ethernet interfaces 2, 3, and 4 of the

switch. The second rule permits all non-Finance traffic on the ports. The second rule is

required because an explicit deny all rule exists as the lowest priority rule.

Differentiated Services (DiffServ)

Standard IP-based networks are designed to provide best effort data delivery service. Best

effort service implies that the network delivers the data in a timely fashion, although there is

no guarantee that it does. During times of congestion, packets might be delayed, sent

sporadically, or dropped. For typical Internet applications, such as email and file transfer, a

slight degradation in service is acceptable and in many cases unnoticeable. However, any

degradation of service can negatively affect applications with strict timing requirements, such

as voice or multimedia.

Quality of Service (QoS) can provide consistent, predictable data delivery by distinguishing

between packets with strict timing requirements from those that are more tolerant of delay.

Packets with strict timing requirements are given special treatment in a QoS-capable

network. With this in mind, all elements of the network must be QoS capable. If one node

cannot meet the necessary timing requirements, this creates a deficiency in the network path

and the performance of the entire packet flow is compromised.

Two basic types of QoS are supported:

• Integrated Services. Network resources are apportioned based on request and are

reserved (resource reservation) according to network management policy (RSVP, for

example).

• Differentiated Services. Network resources are apportioned based on traffic

classification and priority, giving preferential treatment to data with strict timing

requirements.

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