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OnSite 2800 Series User Manual | 8 • Link scheduler configuration |
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NAPT
Profile
Context |
| IP |
use command | router | |
Interfaces | ACL |
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Profile |
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| bind command |
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Circuit |
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Ports | Ethernet |
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Service
Policy
Profile
use command
bind command
PVC
Serial |
Figure 17. IP context and related elements
Configuring quality of service (QoS)
In the OnSite 2800, the link scheduler enables the definition of QoS profiles for network traffic on a certain interface, as shown in figure 17. 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 net- works, and
•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 OnSite 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 OnSite and the queueing would happen in the modem, which does not distinguish between packet types. To improve QoS, you can configure the OnSite to send no more data to the Internet than the modem can carry. This keeps the modem’s queue empty and gives the OnSite 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
Configuring quality of service (QoS) | 95 |