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Introduction 1-28

NAM / Traffic Analyzer v3.5 Tutorial

Introduction 1-28

NAM / Traffic Analyzer v3.5 Tutorial

Traffic Analyzer Software

Differentiated-Services Monitoring (DS-MON)

Traffic Analyzer Software

Differentiated-Services Monitoring (DS-MON)

NAM-Embedded Traffic Analyzer

DSMON

MIB

DSMON

MIB

FTP

SNMP

ICMP

http

FTP

SNMP

Ethernet Header

IP Header

TCP Header

Ethernet

FTP Data

(DSCP0)

(

(DSCP0

)

(DSCP0) (DSCP24)(DSCP24)

(DSCP26)

(DSCP40)

DiffServ monitoring can be used to:

• Validate planning assumptions

and QoS allocations

• Detect incorrectly marked or

unauthorized traffic

DiffServ monitoring can be used to:

• Validate planning assumptions

and QoS allocations

• Detect incorrectly marked or

unauthorized traffic

DiffServ Monitoring

The NAM also incorporates Differentiated Services (DiffServ) monitoring by implementing DSMON, a

DiffServ monitoring specification. An extension of the RMON methodology, DSMON looks into the IP header

of every packet to identify the DiffServ code point that defines how DiffServ, enabled on devices, should

handle a packet. Couple this ability with RMON packet analysis and you can see how the NAM can give you

the same host, application, and conversation pair statistics for every DiffServ code point (DSCP) it observes.

In essence, the NAM aggregates statistics by DSCP and it also supports grouping of DSCPs into classes of

service that map onto the QoS policies that you have implemented. This enables you to fully customize how

the NAM reports DiffServ statistics so that it matches your environment.

Using the NAM DiffServ monitoring capabilities, you can identify which hosts, conversations, and

applications participate in each grouping of DiffServ classes. You can use this information to validate and

tune your planning assumptions and QoS allocations. You can also use it to detect incorrectly marked or

unauthorized traffic.