End-to-end QoS deployment techniques for Cisco Catalyst series switches
Examine various QoS components, including congestion management, congestion
avoidance, shaping, policing/admission control, signaling, link efficiency mechanisms, and classification and marking
Map specified class of service (CoS) values to various queues and maintain CoS values through the use of 802.1q tagging on the Cisco Catalyst 2900XL, 3500XL and Catalyst 4000 and 2948G/2980G CatOS Family of Switches
Learn about classification and rewrite capabilities and queue scheduling on the Cisco Catalyst 5000
Implement ACLs, ACPs, ACEs, and low-latency queuing on the Cisco Catalyst 2950 and 3550 Family of Switches
Understand classification, policying, and scheduling capabilities of the Catalyst 4000 and 4500 IOS Family of Switches
Configure QoS in both Hybrid and Native mode on the Catalyst 6500 Family of Switches Utilize Layer 3 QoS to classify varying levels of service with the Catalyst 6500 MSFC and Flexwan
Understand how to apply QoS in campus network designs by examining end-to-end case studies
Quality of service (QoS) is the set of techniques designed to manage network resources. QoS refers to the capability of a network to provide better service to selected network traffic over various LAN and WAN technologies. The primary goal of QoS is to provide flow priority, including dedicated bandwidth, controlled jitter and latency (required by some interactive and delay-sensitive traffic), and improved loss characteristics.
While QoS has become an essential technology for those organizations rolling out a new
Case Study
Figure 4-4 illustrates a network that consists of two Catalyst 5000 switches implementing several QoS features to differentiate service in network.
Figure 4-4. Case Study Topology
A time-sensitive application using the Systems Network Architecture (SNA) protocols exists in the network depicted in Figure 4-4. In this topology, the application handles banking
transactions. The client and servers send only untagged frames. To classify frames accordingly, the Switch-1 configuration consists of classification based on ingress port. This configuration is illustrated by the set port qos command in Example 4-17.
Furthermore, a telephony gateway exists in the network. The telephony gateway sends keepalive packets to other telephony devices across VLAN boundaries to the core of the network. The telephony gateway transmits all keepalives with UDP source and destination ports of 25000. The telephony gateway does not tag the frames, and as a result does not apply a CoS value to transmitted frames. To classify the frames appropriately, both Catalyst 5500 switches use ACL-based classification and marking to set the CoS value of frames matching the signature of the telephony keepalives. As a result, these switches only classify the keepalive frames and not regular traffic. Example 4-17 illustrates this ACL-based classification configuration for Switch-1.
For appropriate congestion management of frames, the switch-to-switch connections and the ports connecting the SNA servers and the telephony gateway all utilize WRED scheduling. The WRED scheduling is nondefault to apply heavier weighted scheduling to packets with a CoS value of 5. Example 4-18 shows this configuration for Switch-1.
• Table of Contents
• Index
Cisco Catalyst QoS: Quality of Service in Campus Networks By Mike Flannagan CCIE® No. 7651, Richard Froom CCIE No. 5102, Kevin Turek CCIE No. 7284
Publisher: Cisco Press Pub Date: June 06, 2003
ISBN: 1-58705-120-6 Pages: 432
End-to-end QoS deployment techniques for Cisco Catalyst series switches
Examine various QoS components, including congestion management, congestion
avoidance, shaping, policing/admission control, signaling, link efficiency mechanisms, and classification and marking
Map specified class of service (CoS) values to various queues and maintain CoS values through the use of 802.1q tagging on the Cisco Catalyst 2900XL, 3500XL and Catalyst 4000 and 2948G/2980G CatOS Family of Switches
Learn about classification and rewrite capabilities and queue scheduling on the Cisco Catalyst 5000
Implement ACLs, ACPs, ACEs, and low-latency queuing on the Cisco Catalyst 2950 and 3550 Family of Switches
Understand classification, policying, and scheduling capabilities of the Catalyst 4000 and 4500 IOS Family of Switches
Configure QoS in both Hybrid and Native mode on the Catalyst 6500 Family of Switches Utilize Layer 3 QoS to classify varying levels of service with the Catalyst 6500 MSFC and Flexwan
Understand how to apply QoS in campus network designs by examining end-to-end case studies
Quality of service (QoS) is the set of techniques designed to manage network resources. QoS refers to the capability of a network to provide better service to selected network traffic over various LAN and WAN technologies. The primary goal of QoS is to provide flow priority, including dedicated bandwidth, controlled jitter and latency (required by some interactive and delay-sensitive traffic), and improved loss characteristics.
While QoS has become an essential technology for those organizations rolling out a new
Example 4-18. Case Study Configuration for Switch-1
Switch> (enable) show config
This command shows non-default configurations only.
Use 'show config all' to show both default and non-default configurations.
(text deleted) begin
!
# ***** NON-DEFAULT CONFIGURATION *****
!
(text deleted)
!
#qos
set qos enable
set qos ip-filter 5 udp any 25000 any 25000 set qos map 1q4t 1 1 cos 2
set qos map 1q4t 1 2 cos 4
set qos wred-threshold 1q4t tx queue 1 20 30 100 100
!
# default port status is enable
!
!
#module 1 : 2-port 1000BaseX Supervisor IIIG set vlan 5 1/1-2
set trunk 1/1 off negotiate 1-1005 set trunk 1/2 off negotiate 1-1005
!
#module 3 : 24-port 10/100BaseTX Ethernet
• Table of Contents
• Index
Cisco Catalyst QoS: Quality of Service in Campus Networks By Mike Flannagan CCIE® No. 7651, Richard Froom CCIE No. 5102, Kevin Turek CCIE No. 7284
Publisher: Cisco Press Pub Date: June 06, 2003
ISBN: 1-58705-120-6 Pages: 432
End-to-end QoS deployment techniques for Cisco Catalyst series switches
Examine various QoS components, including congestion management, congestion
avoidance, shaping, policing/admission control, signaling, link efficiency mechanisms, and classification and marking
Map specified class of service (CoS) values to various queues and maintain CoS values through the use of 802.1q tagging on the Cisco Catalyst 2900XL, 3500XL and Catalyst 4000 and 2948G/2980G CatOS Family of Switches
Learn about classification and rewrite capabilities and queue scheduling on the Cisco Catalyst 5000
Implement ACLs, ACPs, ACEs, and low-latency queuing on the Cisco Catalyst 2950 and 3550 Family of Switches
Understand classification, policying, and scheduling capabilities of the Catalyst 4000 and 4500 IOS Family of Switches
Configure QoS in both Hybrid and Native mode on the Catalyst 6500 Family of Switches Utilize Layer 3 QoS to classify varying levels of service with the Catalyst 6500 MSFC and Flexwan
Understand how to apply QoS in campus network designs by examining end-to-end case studies
Quality of service (QoS) is the set of techniques designed to manage network resources. QoS refers to the capability of a network to provide better service to selected network traffic over various LAN and WAN technologies. The primary goal of QoS is to provide flow priority, including dedicated bandwidth, controlled jitter and latency (required by some interactive and delay-sensitive traffic), and improved loss characteristics.
While QoS has become an essential technology for those organizations rolling out a new set vlan 1 3/1
set vlan 2 3/2 set vlan 4 3/20-24 set vlan 5 3/3-19
set port qos 3/20-21 cos 5
!
(text deleted)!
#module 15 : 1-port Route Switch Feature Card
!
#module 16 empty
!
(text deleted)
!
#qos router-mac
set qos router-mac 00-30-f2-c8-8e-dc 5 set qos router-mac 00-30-f2-c8-8e-dc 4 end
• Table of Contents
• Index
Cisco Catalyst QoS: Quality of Service in Campus Networks By Mike Flannagan CCIE® No. 7651, Richard Froom CCIE No. 5102, Kevin Turek CCIE No. 7284
Publisher: Cisco Press Pub Date: June 06, 2003
ISBN: 1-58705-120-6 Pages: 432
End-to-end QoS deployment techniques for Cisco Catalyst series switches
Examine various QoS components, including congestion management, congestion
avoidance, shaping, policing/admission control, signaling, link efficiency mechanisms, and classification and marking
Map specified class of service (CoS) values to various queues and maintain CoS values through the use of 802.1q tagging on the Cisco Catalyst 2900XL, 3500XL and Catalyst 4000 and 2948G/2980G CatOS Family of Switches
Learn about classification and rewrite capabilities and queue scheduling on the Cisco Catalyst 5000
Implement ACLs, ACPs, ACEs, and low-latency queuing on the Cisco Catalyst 2950 and 3550 Family of Switches
Understand classification, policying, and scheduling capabilities of the Catalyst 4000 and 4500 IOS Family of Switches
Configure QoS in both Hybrid and Native mode on the Catalyst 6500 Family of Switches Utilize Layer 3 QoS to classify varying levels of service with the Catalyst 6500 MSFC and Flexwan
Understand how to apply QoS in campus network designs by examining end-to-end case studies
Quality of service (QoS) is the set of techniques designed to manage network resources. QoS refers to the capability of a network to provide better service to selected network traffic over various LAN and WAN technologies. The primary goal of QoS is to provide flow priority, including dedicated bandwidth, controlled jitter and latency (required by some interactive and delay-sensitive traffic), and improved loss characteristics.
While QoS has become an essential technology for those organizations rolling out a new
Summary
The Catalyst 5000 Family of switches supports QoS with only specific Supervisors and line modules. These switches support QoS features limited to classification of untagged frames, marking based on ACEs, and output scheduling. These features classify frames solely on CoS values. For most applications, DSCP classification is desirable. As a result, network designs should not introduce the Catalyst 5000 Family of switches into a QoS end-to-end architecture;
instead, utilize the Catalyst 5000 Family of switches only in existing deployments. In summary, the QoS feature support on the Catalyst 5000 Family of switches is as follows:
QoS support requires one of the following Supervisors: Supervisor III with NFFC II, Supervisor IIG, or Supervisor IIIG.
QoS support requires traffic ingress and egress using the following line modules or uplink modules: X5234-RJ45, X5236-FX-MT, X5239-RJ21, U5537-FETX, or WS-U5538-FEFX-MMF.
No support for input scheduling exists.
Classification based on CoS only; no support for classification based on IP precedence or DSCP.
Marking of CoS and ToS supported with limitations with regard to MLS.
CoS value determines ToS value for ACE-based marking.
Congestion avoidance achieved via WRED using a 1q4t mechanism.
Global mapping of CoS values to thresholds is configurable.
Thresholds are configurable on a global basis.
• Table of Contents
• Index
Cisco Catalyst QoS: Quality of Service in Campus Networks By Mike Flannagan CCIE® No. 7651, Richard Froom CCIE No. 5102, Kevin Turek CCIE No. 7284
Publisher: Cisco Press Pub Date: June 06, 2003
ISBN: 1-58705-120-6 Pages: 432
End-to-end QoS deployment techniques for Cisco Catalyst series switches
Examine various QoS components, including congestion management, congestion
avoidance, shaping, policing/admission control, signaling, link efficiency mechanisms, and classification and marking
Map specified class of service (CoS) values to various queues and maintain CoS values through the use of 802.1q tagging on the Cisco Catalyst 2900XL, 3500XL and Catalyst 4000 and 2948G/2980G CatOS Family of Switches
Learn about classification and rewrite capabilities and queue scheduling on the Cisco Catalyst 5000
Implement ACLs, ACPs, ACEs, and low-latency queuing on the Cisco Catalyst 2950 and 3550 Family of Switches
Understand classification, policying, and scheduling capabilities of the Catalyst 4000 and 4500 IOS Family of Switches
Configure QoS in both Hybrid and Native mode on the Catalyst 6500 Family of Switches Utilize Layer 3 QoS to classify varying levels of service with the Catalyst 6500 MSFC and Flexwan
Understand how to apply QoS in campus network designs by examining end-to-end case studies
Quality of service (QoS) is the set of techniques designed to manage network resources. QoS refers to the capability of a network to provide better service to selected network traffic over various LAN and WAN technologies. The primary goal of QoS is to provide flow priority, including dedicated bandwidth, controlled jitter and latency (required by some interactive and delay-sensitive traffic), and improved loss characteristics.
While QoS has become an essential technology for those organizations rolling out a new