Cisco Catalyst 4507R-E Supplementary Manual page 2

Cisco Catalyst 4500 Series Supervisor Engine 6-E
Quality of Service
Queueing and scheduling: Queueing is the QoS mecha-
nism used to empty the queues of data and send the
data onward to its destination. The scheduling options
available in the Supervisor Engine 6-E are per port, per
queue virtual time shaping and sharing (VTSS) and
strict priority queuing. The per port, per queue shaping
and sharing provide flexible options for enterprise
networks with diversified traffic. The Supervisor Engine
6-E includes as many as eight egress queues for traffic
placement, including the option of a priority queue.
Dynamic buffer allocation in the Supervisor Engine 6-E
provides the ability to modify buffering assignments
throughout the chassis regardless of the port. Also, the
scheduling algorithm provides dynamic bandwidth
allocation, such that no bandwidth ever goes unused if a
queue is empty.
QoS Innovations on the Cisco Catalyst 4500
Series Supervisor Engine 6-E Enabled by New
CenterFlex Technology
CenterFlex technology enables many Supervisor Engine
6-E QoS enhancements, including increased configura-
tion flexibility and ease of use with the Modular QoS CLI
(MQC)-compliant command-line interface (CLI). Cisco' s
MQC CLI is a company standard for QoS that provides
configuration simplicity for the network administrator; it
is no longer necessary to understand switch-specific
configurations. This CLI flexibility extends to all current
chassis and line cards and provides them with a larger
number of queues, configurable thresholds per queue,
configurable per port buffering, dynamic bandwidth
allocation, per port and per queue shaping and sharing,
and configuration tools such as QoS groups, and table
maps. All of these features in the Supervisor Engine 6-E
provide the network administrator with a QoS toolkit far
more advanced than those of the previous generation of
supervisor engines in the Cisco Catalyst 4500 Series.
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Deliver a Robust Network with the Cisco
Catalyst 4500 Series Supervisor Engine 6-E QoS
Feature Toolkit
The Supervisor Engine 6-E also provides Auto QoS, a set
of Cisco best-practice predefined macro commands.
The architecture helps enable all QoS features with no
switching performance degradation.
These features provide what is needed in today' s con-
verged networks by allowing a highly customized QoS
profile configuration applied to the ports or VLANs for
maximum flexibility.
At-A-Glance
C45-438302-00 10/07