Feature History For Qos Packet Marking; Benefits Of Qos Packet Marking - Cisco 10000 Series Configuration Manual

Chapter 7 Marking Traffic

Feature History for QoS Packet Marking

Cisco IOS Release
Release 12.0(17)SL
Release 12.0(22)S
Release 12.2(16)BX
Release 12.3(7)XI1
Release 12.2(28)SB
Release 12.2(31)SB2
Release 12.2(33)SB

Benefits of QoS Packet Marking

Network Partitioning and Categorizing
Packet marking allows you to partition your network into multiple priority levels or classes of service.
Layer 2 to Layer 3 Mapping
If a packet that needs to be marked to differentiate user-defined QoS services is leaving the router and
entering a switch, the router can set the class of service (CoS) value of the packet because the switch can
process the Layer 2 CoS header marking.
Weighted Random Early Detection Configuration
Weighted random early detection (WRED) uses IP precedence values or IP DSCP values to determine
the drop probability of a packet. Therefore, you can use the IP precedence and IP DSCP markings with
the WRED feature.
Improved Bandwidth Management in ATM Networks
The ability to set the ATM CLP bit allows you to extend your IP QoS policies into an ATM network. As
congestion occurs in the ATM network, cells with the CLP bit set are more likely to be dropped, resulting
in improved network performance for higher priority traffic and applications.
OL-7433-09
Description
The marking feature was introduced on the router.
This feature was enhanced to support MPLS experimental
marking.
This feature was introduced on the PRE2 and enhanced to
support 802.1Q class of service marking.
This feature was enhanced on the PRE2 to support MPLS
experimental marking on all imposed label entries and
discard-class marking.
This feature was integrated in Cisco IOS
Release 12.2(28)SB for the PRE2.
This feature was introduced on the PRE3 for class of
service marking. Enhancements to the modular QoS CLI
allow you to mark the IP DSCP bits of traffic on the L2TP
access concentrator (LAC). The Class-Based Frame Relay
DE Bit Marking and Tunnel Header Marking features were
also introduced on the PRE3.
This feature was enhanced to support Class-Based Frame
Relay DE Bit Marking on the PRE4.
Cisco 10000 Series Router Quality of Service Configuration Guide
QoS Packet Marking
Required PRE
PRE1
PRE1
PRE2
PRE2
PRE2
PRE3
PRE3, PRE4
7-3