19-2
Cisco 10000 Series Router Quality of Service Configuration Guide
OL-7433-09
Chapter 19 Configuring Quality of Service for PVC Bundles
PVC Bundles
•
Use Weighted Random Early Detection (WRED) to further differentiate service across traffic that
has different precedence, DSCP, or MPLS EXP levels.
To determine which PVC in the bundle to use to forward an IP or MPLS packet, the router examines the
packet’s priority bits or Type of Service (ToS) field, or the packet’s EXP bits. Each PVC in the bundle
is configured to carry packets whose priority matches the configured precedence, DSCP, or MPLS EXP
level. Combined with a queuing mechanism at the output interface, this offers a complete QoS solution
for both data and voice, and allows for further granularization of data types to differentiate data
priorities.
The router supports both ATM and Frame Relay PVC bundles.
Figure 19-1
shows a PVC bundle.
Figure 19-1
PVC Bundle
Feature History for PVC Bundles
System Limits for PVC Bundles
Table 19-1
lists the system limits for PVC bundles.
Cisco IOS Release
Description
Required PRE
Release 12.0(26)S
PVC bundles over ATM and Frame Relay were introduced
on the PRE1 and included support for IP precedence and
DSCP-based PVC selection. The ATM PVC Bundle
Enhancement—MPLS EXP-Based PVC Selection feature
and the Frame Relay PVC Bundles with QoS Support for
IP and MPLS feature were also introduced.
PRE1
132316
Point-to-Point
Table 19-1 System Limits for PVC Bundles
Bundle
Type
Max. No. of Members
Per Bundle
Max. No. of Bundles
Per System
ATM
8
16,000
Frame Relay
8
16,000
