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					Network Performance Analysis

      ABC Corporation




                        PREPARED FOR: IT Manager
                                  ABC Corporation

                         PREPARED BY: Joe Barger
                               The Northstar Group

                                DATE: Oct 1, 2006
                                                      Network Performance Analysis




                                  Table of Contents


Section I: Executive Summary

Section II: Methodology

Section III: Analysis by Location

A. Location A Analysis
        1. Traffic Discovery and Analysis
        2. Network Efficiency
        3. Link Utilization

B. Location B Analysis
        1. Traffic Discovery and Analysis
        2. Network Efficiency
        3. Link Utilization

C. Location C Analysis
        1. Traffic Discovery and Analysis
        2. Network Efficiency
        3. Link Utilization

Section IV: Special Supplement
        Microsoft Exchange Performance Analysis

Section V: Summary and Recommendations




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                                                                 Network Performance Analysis




About The Northstar Group
The Northstar Group provides a comprehensive solution to help customers improve
business performance. Core competencies are in the areas of network infrastructure
design, application traffic management and networking products. The Northstar Group is
an authorized Packeteer partner and has fully certified Packeteer experts on staff. For over
11 years, we have provided top rate service for enterprise customers throughout the
Southern California region.




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                                                                Network Performance Analysis


Section I: Executive Summary

The Northstar Group conducted a Network Performance Analysis over a one-week
period at Customer locations A, B and C. For each location, a multi-part analysis was
conducted, including:

    1. Traffic Discovery and Analysis – Identifies and classifies applications running on
       the network
    2. Network Efficiency - Identifies percentage of network traffic devoted to packet
       retransmissions
    3. Bandwidth Utilization – Examines inbound and outbound link utilization to
       determine the peak and average link utilization and understand capacity
       requirements

In addition, a specific analysis of Microsoft Exchange traffic was performed in response
to ABC’s concerns about recent performance issues.


Section II: Methodology
The Northstar Group deployed Packeteer PacketShapers at Locations A, B and C to
collect data for the analysis. The Packet Shapers were installed without incident in the
network, and immediately began gathering data about ABC Corporation’s network. The
devices were deployed at each location for one week in order to compile a realistic view
of network behavior. The PacketShapers gathered statistics on the types of traffic, the top
users, the latency of specific applications, and WAN performance based on bandwidth
utilization and retransmissions. The subsequent report is tailored to focus on the
locations experiencing the most severe performance issues.

Joe Barger, a network engineer for The Northstar Group and a Packeteer Certified
Specialist, conducted the analysis. Reports were generated from the data gathered. The
Northstar Group’s network performance analysis team reviewed the reports, and
recommendations for corrective action were discussed and have been documented in this
report for review with ABC Corporation.




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                                                                  Network Performance Analysis


 Section III. Analysis by Location

 A. Location A Analysis

         1. Traffic Discovery and Analysis

 Traffic Discovery is the process of identifying the application and traffic types that are
 running over the wide area link for this location. The objective for this analysis is to
 identify the 10 most active applications and reveal the bandwidth usage for each
 application in bits-per-second as well as the percentage of total bandwidth used by each
 application for inbound and outbound traffic.



                                                                          Inbound:
                                                                          The combination of
                                                                          Dcom and Exchange
                                                                          make up 29% of overall
                                                                          bandwidth utilization for
                                                                          ABC. Web browsing
                                                                          makes up another 22%.
                                                                          The NetBIOS-IP traffic
                                                                          is the protocol for
                                                                          windows file and drive
                                                                          sharing and uses another
                                                                          13%.



Outbound:
Appliance
Replication traffic
consumed 74% of
outbound bandwidth
utilization. This
application needs to
be reviewed by ABC
to determine if this
activity can take
place after hours.




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                                                               Network Performance Analysis
        2. Network Efficiency
The next thing to analyze is bandwidth use in comparison to the CIR and port speed.
Additionally, the number of retransmissions gives us an idea of packet loss across the
network, which can be indicative of congestion or over-subscription. The general term
for this is Network Efficiency. This graph indicates that during most of the day,
retransmitted packets are rare. The percentages represented here indicate that on average,
100% of the throughput is good which means that packets are not being retransmitted. If
there is a decrease in percentage of throughput, it is due to network congestion and/or
overflowing router queues. Both can cause packet loss and timeouts, which force
retransmissions and exacerbate the original problem.



                                                                       Inbound:
                                                                       Overall inbound
                                                                       retransmissions are
                                                                       very low indicating
                                                                       excellent network
                                                                       efficiency for
                                                                       ABC.




    Outbound:
    Overall outbound
    retransmissions are
    very low indicating
    excellent network
    efficiency for
    ABC.




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                                                                    Network Performance Analysis


           3. Network Utilization

   Network Utilization is designed to show a link’s average and peak bandwidth
   consumption in bits-per-second. Average bandwidth alone does not tell the complete
   story. Averages, especially over long periods of time, can be misleading and lead to the
   false conclusion that ample capacity exists. However, reports on peak utilization can
   reveal traffic that is hitting a capacity limit frequently. During these periods, there is
   contention for bandwidth and performance suffers for those applications waiting in the
   queue, which are often business-critical applications.




                                                                                Inbound:
                                                                                Inbound utilization
                                                                                generally averages less
                                                                                than a full T-1 with
                                                                                several peaks up to or
                                                                                close to the 4.5Mbps
                                                                                access speed. The delta
                                                                                between the peak and
                                                                                average indicates that
                                                                                the data being received
                                                                                is very bursty.




Inbound:
The average rate of
bandwidth utilization
appears to be fairly well
split among the top ten
applications. Email and
external web browsing are
the largest users of
bandwidth. The three
largest peaks are during
the normal business hours
of Friday, Monday and
Tuesday.




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                                         Network Performance Analysis




                                             Outbound:
                                             Outbound utilization also
                                             generally averages less than a
                                             full T-1 with several peaks up to
                                             or close to the 2.5Mbps access
                                             speed. The delta between peak
                                             and average indicates that the
                                             data being received is quite
                                             bursty. There are several
                                             methods that can reduce the
                                             overall average utilization and
                                             reduce the delta between peak
                                             and average.




Outbound:
The average rate for
outbound utilization
shows that a vast
majority of
bandwidth is being
consumed by the
Appliance
Replication traffic.




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                                                              Network Performance Analysis

Section IV: Special Supplement
In addition to the Network Performance Analysis, an analysis of Microsoft Exchange
traffic was also conducted in response to ABC concerns about recent performance issues




 Exchange Inbound Efficiency                DCOM Inbound Utilization




                                                                  Inbound:
                                                                  DCOM has appeared as a
                                                                  significant consumer of
                                                                  Inbound and Outbound
                                                                  bandwidth utilization. Top
                                                                  talker and listener analysis
                                                                  shows that it is directed to
                                                                  devices not included in the
                                                                  MS Exchange server list
                                                                  supplied by ABC. The email
                                                                  servers that this site has
                                                                  configured should be
                                                                  investigated, as it appears that
                                                                  multiple email servers are
                                                                  being utilized.




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                                                      Network Performance Analysis




 Exchange Outbound Efficiency       DCOM Outbound Utilization




                                                                Outbound:
                                                                A bandwidth
                                                                partition policy
                                                                should be applied to
                                                                email to limit the
                                                                amount of
                                                                bandwidth Microsoft
                                                                Exchange consumes.




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                                                                Network Performance Analysis



Summary
Both inbound and outbound average bandwidth utilization are less than 1.5 Mbps. All
applications analyzed during this project show very bursty traffic, while email and web
browsing, consuming 51% of all bandwidth, monopolize inbound traffic. The Appliance-
Replication traffic consumed 74% of overall outbound bandwidth.

The Northstar Group recommends that the Appliance-Replication application be removed
from the network during normal business hours. If this is not possible, then we
recommend that a bandwidth partition and rate control policy be applied through the on-
going use of PacketShapers. This will greatly reduce the amount of bandwidth required
at this location. We also recommend that a combination of rate, partition and priority
policies be applied to Microsoft Exchange using PacketShapers at the appropriate
locations.

The Northstar Group believes that with the implementation of these recommendations,
bandwidth at this site could be reduced by two thirds to a single T-1. This would greatly
reduce the monthly recurring WAN costs for this site. This would require reducing the
access to the Internet along with removing the Appliance-Replication application. If this
is not possible, the same policies could be applied to reduce bandwidth by a single T-1.

The recommended next steps are:
   1. Apply control policies to each PacketShaper and assess the impact for one week.
   2. Perform a Network Performance Analysis for locations D,E,F.
   3. Add PacketShaper 1700 appliances to locations G, H, I, J, K, L.
   4. Demonstrate Report Center and the benefit of centralized reporting for all
       locations. Add ReportCenter to implementation.


Thanks again for this opportunity to partner with you in providing solutions and services
to your company. We look forward to a continued partnership with ABC Corporation.




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                                                              Network Performance Analysis




Network Performance Analysis Team

Bruce North               President                  bnorth@nstargroup.com
Ali North                 Vice President             anorth@nstargroup.com
Robert Stubbs             Sr. Network Engineer       rstubbs@nstargroup.com
Joe Barger                Network Engineer           jbarger@nstargroup.com


For more information or to schedule a network performance consultation, call
1.949.443.9146 or email us at info@nstargroup.com



The Northstar Group
30 Glastonbury Place
Laguna Niguel, CA 92677

949.338.9146 (v)
949.661.5271 (f)
www.nstargroup.com




Proprietary and Confidential               Page 12                            May 19, 2005

				
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