Cisco 7100 Series Spezifikationen PDF herunterladen (Seite 39)

Intranet VPN Business Scenario 3-9

Step 2—Configuring Quality of Service

You conﬁgure QoS features throughout a network to provide for end-to-end QoS delivery.

The following three components are necessary to deliver QoS across a heterogeneous

network:

• QoS within a single network element, which includes queuing, scheduling, and trafﬁc

shaping features.

• QoS signaling techniques for coordinating QoS from end-to-end between network

elements.

• QoS policing and management functions to control and administer end-to-end trafﬁc

across a network.

Not all QoS techniques are appropriate for all network routers. Because edge routers and

backbone routers in a network do not necessarily perform the same operations, the QoS

tasks they perform might differ as well.

In general, edge routers perform the following QoS functions:

• Packet classiﬁcation and prioritization

• Admission control, such as queuing and policing

• Bandwidth management

In general, backbone routers perform the following QoS functions:

• Congestion management

• Congestion avoidance

Cisco IOS QoS service models, features, and sample conﬁgurations are explained in detail

in the Quality of Service Solutions Conﬁguration Guide and the Quality of Service

Solutions Command Reference. Refer to these two publications as you plan and implement

a QoS strategy for your VPN, because there are various QoS service models and features

that you can implement on your VPN.

This section contains basic steps to conﬁgure QoS weighted fair queuing (WFQ), which

applies priority (or weights) to identiﬁed trafﬁc, on the GRE tunnel you conﬁgured in the

“Step 1—Conﬁguring the Tunnel” section on page 3-4 and includes the following tasks:

1 Conﬁguring Weighted Fair Queuing

2 Verifying Weighted Fair Queuing

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Cisco 7100 Series Spezifikationen Seite 39