January 2001
Intermediate to advanced
368 pages
11h 35m
English
Content preview from IP Quality of Service
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End-to-End IP QoS 225
Figure 9-7 QoS in an MPLS Network
When an ATM switch doesn’t support MPLS, you can use ATM QoS using the ATM Forum
traffic class (Constant Bit Rate [CBR], Variable Bit Rate [VBR], and ABR) and its IP
interworking, as discussed in Chapter 8, “Layer 2 QoS: Interworking with IP QoS.”
End-to-End IP QoS
You can set the MPLS CoS bits at the edge of the network to provide traffic classification
so that the QoS functions within the network can provide differentiated QoS. As such, to
deliver end-to-end IP QoS across a QoS-enabled MPLS network, you map or copy the
IP precedence value to the MPLS CoS bits at the edge of the MPLS network. ...
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