C H A P T E R
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Cisco 10000 Series Router Quality of Service Configuration Guide
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Configuring Quality of Service for PVC Bundles
Networks can span many geographical locations and can utilize the full spectrum of networking
technologies available for both network access and the network core. In some networks the core
connections are over existing low-speed Frame Relay or ATM networks. Because service providers have
invested substantially in these networks, providers need a way to differentiate themselves from other
providers and increase profitability while using these low-speed links. The Cisco 10000 series router
offers advanced IP QoS as a solution.
The Cisco 10000 series router provides IP QoS over multiple ATM and Frame Relay PVCs combined
into PVC bundles. By using PVC bundles and QoS-based PVC selection to carry packets, service
providers can increase bandwidth between two routers when the connectivity is limited to low-speed
switched circuits.
This chapter describes PVC bundles and QoS-based PVC selection over ATM and Frame Relay PVCs.
It includes the following topics:
•
PVC Bundles, page 19-1
•
ATM PVC Selection, page 19-4
•
Frame Relay PVC Selection, page 19-31
•
Related Documentation, page 19-53
PVC Bundles
A PVC bundle is a group of permanent virtual circuits (PVCs) combined into a logical group with a
single, virtual interface that connects to a peer system. PVC bundles enable service providers to offer
different levels of service through the use of IP precedence, differentiated services code point (DSCP),
and Multiprotocol Label Switching (MPLS) experimental (EXP) levels, and QoS features. Using the
PVC bundle management software, you can create a bundle of PVCs between a pair of connected routers
and assign different QoS characteristics to individual PVCs in the bundle. Each PVC in a bundle has its
own traffic class and traffic parameters, and is configured to carry packets whose priority matches the
configured range.
Using PVC bundles, you can do the following:
•
Create differentiated service by distributing IP precedence, DSCP, or MPLS EXP levels over
different PVCs in the bundle.
•
Map a single precedence, DSCP, or MPLS EXP level or a range of levels to each discrete PVC in
the bundle, thereby enabling individual PVCs in the bundle to carry packets marked with different
levels.
