Specifications

© 2006 Cisco Systems, Inc.
All rights reserved.
Scenarios 3-34
NAM / Traffic Analyzer v3.5 Tutorial
© 2006 Cisco Systems, Inc. All rights reserved.
Scenarios 3-34
NAM / Traffic Analyzer v3.5 Tutorial
Scenario 3
QoS Monitoring (Using DiffServ and ART)
Scenario 3
QoS Monitoring (Using DiffServ and ART)
DST MAC xx-xx-xx-xx-xx-xx
SRC MAC yy-yy-yy-yy-yy-yy
-----------------------------------------
IP Header
DiffServ Field XXXXXX
.
.
.
0 DSCP0
1
2
3
4 AZT1
.
.
.
64
DSCP0
DSCP = 0
DSCP0
DSCP = 0
AZT1
DSCP = 4
AZT1
DSCP = 4
Other
DSCP = 1
2, 3, 5-63
Other
DSCP = 1
2, 3, 5-63
Traffic Statistics
Application Statistics
Host Statistics
Traffic Statistics
Application Statistics
Host Statistics
Traffic Statistics
Application Statistics
Host Statistics
Differentiated Services Monitoring
Request/Response
Application Response Time
Application Response Time
Profile
(User Configurable)
Scenario 3 - QoS Monitoring (Using DiffServ and ART)
Networks today increasingly incorporate quality-of-service (QoS) technologies to prioritize traffic. The NAM
provides several monitoring features to allow you to view prioritized traffic to help ensure proper configuration
and to minimize misuse.
The Differentiated Services field in the IP header portion of a packet can be set to a value between 0 and 63
(Differentiated Services Code Point [DSCP] value). The network infrastructure equipment can then process
the packets for forwarding according to this value. The use of DSCP values, and the configuration of the
networking equipment to utilize them in forwarding decisions, allows the network designer to implement
different levels of services for different applications based on the DSCP value.
The NAM can collect statistics based on the DSCP value in much the same way as it collects statistics per
VLAN. This gives the network manager the ability to verify and monitor a QoS implementation. The NAM
can also measure application response times for a server to ensure that service levels are being met.
Dean wants to see what server farm (port Gi1/2) traffic is currently using DSCP values and check to see if
any of the servers are experiencing slow response times. If so, Dean knows that he can reconfigure some of
the network infrastructure equipment to give a higher priority to the server traffic. To perform this scenario,
Dean needs to create a Differentiated Services (DiffServ) profile, enable monitoring for the profile, view
results, enable the Application Response Time (ART) feature for desired traffic, and view those results.