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Configuring quality of service (QoS)
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IPLink 3210 Series Getting Started Guide
7 • Link scheduler configuration
Figure 16. IP context and related elements
Configuring quality of service (QoS)
In the IPLink 3210, the link scheduler enables the definition of QoS profiles for network traffic on a certain
interface, as shown in
figure 16
. QoS refers to the ability of a network to provide improved service to selected
network traffic over various underlying technologies including Frame Relay, Ethernet and 802.x type networks,
and IP-routed networks. In particular, QoS features provide improved and more predictable network service by
providing the following services:
•
Supporting dedicated bandwidth
•
Improving loss characteristics
•
Avoiding and managing network congestion
•
Shaping network traffic
•
Setting traffic priorities across the network
Applying scheduling at the bottleneck
When an IPLink acts as an access router, the access link is the point where intelligent use of scarce resources
really makes a difference. Frequently, the access link modem is outside of the IPLink and the queueing would
happen in the modem, which does not distinguish between packet types. To improve QoS, you can configure
the IPLink to send no more data to the Internet than the modem can carry. This keeps the modem’s queue
empty and gives the IPLink control over which packet is sent over the access link at what time.
Using traffic classes
The link scheduler needs to distinguish between different types of packets. We refer to those types as “traffic-
classes”. You can think of the traffic-class as if every packet in the IPLink has a tag attached to it on which the
classification can be noted. The access control list “stage” (ACL) can be used to apply such a traffic-class name
to some type of packet based on its IP-header filtering capabilities. The traffic-class tags exist only inside the
IPLink router, but layer 2 priority bits (802.1pq class-of-service) and IP header type-of-service bits (TOS field)
Ser
ial
PVC
IP
router
bind command
Service
Policy
Profile
Ethe
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et
use command
bind command
use command
NAPT
Profile
ACL
Profile
Context
Interfaces
Circuit
Ports
Summary of Contents for IPLink 3210 Series
Page 4: ...Summary Table of Contents IPLink 3210 Series Getting Started Guide 4...
Page 10: ...Table of Contents IPLink 3210 Series Getting Started Guide 10...
Page 18: ...About this guide IPLink 3210 Series Getting Started Guide 18...
Page 90: ...90 Chapter 8 LEDs status and monitoring Chapter contents Status LEDs 91...
Page 110: ...110 Appendix E IPLink 3210 Series factory configuration Chapter contents Introduction 111...
Page 112: ...112 Appendix F Installation checklist Chapter contents Introduction 113...