Frame Relay Qos Overview; Key Parameters - 3Com MSR 50 Series Configuration Manual

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Frame Relay QoS
Overview
Frame Relay QoS

Key Parameters

F
RAME
On a Frame Relay interface, the user can use the general QoS to provide the
services, such as traffic policing, traffic shaping, congestion management, and
congestion avoidance. Furthermore, a Frame Relay network has its own QoS
mechanisms, including Frame Relay traffic shaping, Frame Relay traffic policing,
Frame Relay congestion management, Frame Relay discard eligibility (DE) rule list
and Frame Relay queuing management.
Compared with the general QoS, Frame Relay QoS can provide the service of QoS
for each PVC on an interface. However, the general QoS can only provide the
service of QoS on the whole interface. Therefore, the Frame Relay QoS can provide
more flexible quality services for users.
Figure 486 Frame Relay QoS application
n
For detailed information on Frame Relay, refer to
page 235.
Several important parameters listed below are used for flow control in frame relay:
Allowed Committed Information Rate (CIR ALLOW): sending rate that the
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frame relay network allows normally. When there is no network congestion, it
ensures the user could send data at this rate.
Committed Information Rate (CIR): The minimum sending rate that can be
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provided by virtual circuit. It ensures the user could send data at this rate even
if network congestion occurs.
Committed Burst Size (CBS): packet traffic that frame relay network is
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committed to send within the interval of a Tc. Upon network congestion, frame
relay network ensures this part of traffic could be successfully sent.
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ONFIGURATION
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