1 / 38

LAN/WAN Optimization Techniques

This agenda details crucial LAN/WAN optimization techniques, focusing on current traffic dynamics, equipment inventory assessments, and forecasting growth. Key elements include operational evaluation criteria for performance, availability, reliability, cost, and security. We will delve into traffic types, response times, protocol overheads, and the impact of messaging on overall network performance. Additionally, we address the importance of understanding equipment and communication needs for effective network design, emphasizing trend forecasting for anticipating future demand.

wynn
Download Presentation

LAN/WAN Optimization Techniques

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LAN/WAN Optimization Techniques

  2. Agenda • Current Traffic • Equipment Inventory and Forecasted Growth • Operational Evaluation Criteria • Network Design Decision Approach

  3. Current Traffic • Loads • Traffic classes • Traffic response times • Transaction types • Protocol overhead

  4. Loads • Traffic Loads : the volume of data communication traffic -data -data transmission overhead

  5. Loads (cont.) • Traffic Load is generally calculated by analytically-based NDTs on the following parameters: -message definition -message characteristics - traffic load is required by NDTs for each location on the network

  6. Loads (cont.) • NDTs calculate traffic load based on standard deviations from average values account for these peaks and valleys in traffic volume -peak -normal -valley

  7. Traffic classes • Traffic loads should be broken down into these types of traffic classes for message prioritizing -real time -interactive -file transfer

  8. Traffic response times • Average transaction response times RT=I+CPU+O

  9. Traffic response times (cont.) • Polling environments : I or O =T+W+S

  10. Traffic response times (cont.) • Service times • Transmission time is the time needed to send the entire message (overhead and text) down the line

  11. Traffic response times (cont.) • Connection delay is the time needed by the front-end processor to establish a connection with terminal, including modem turnarounds • Polling delay is attributed to multipoint lines in which terminals must wait their turn before being polled by the front-end processor

  12. Traffic response times (cont.) • Arrival rates: number of messages that arrive at all the terminals on the line • Line utilization (U) • Waiting time (W) P-K formula:

  13. Transaction types • The most appropriate approach calculates response time based on the varied mixture of transaction types that each location supports

  14. Protocol overhead • Control messages are necessary in both poll and select scenarios to inquire if the terminal has data to send or is ready to receive -polling mode -select mode -control message : requires data rates, line sizes -protocol overhead

  15. Protocol overhead (cont.)

  16. agenda • Current Traffic • Equipment Inventory and Forecasted Growth • Operational Evaluation Criteria • Network Design Decision Approach

  17. Equipment Inventory and Forecasted Growth • Equipment inventory • Inventory • forecasting

  18. Equipment inventory • Without an accurate awareness of the communications network, design and analysis is impractical • Equipment inventories and growth forecasts develop an understanding of the network that is fundamental to any engineering process

  19. Inventory • An essential of network design is identifying communications equipment • Physical resources -compatibility -meet the needs of the network’s users

  20. Inventory (cont.) • Location-in order to identifying communication equipment types, locations of all devices must be specified -equipment types and locations are known, fixed, unalterable -equipment types and location possibilities are known - equipment locations determination accommodates an unlimited selection of possibilities • Types-reference 6.4 communication hardware

  21. forecasting • Network engineers need to consider forecasted growth when conducting design exercises • Forecasting growth is critical during network design • Once current and future applications of data communications have been identified, engineer must forecast growth trends in usage over the planning period

  22. Forecasting (cont.) • Forecasting based on trends is the safest method of determining the future of data communications traffic demands -trend lines are independent of business activity -outside affects are suspected -trend lines generally follow business activity

  23. Forecasting (cont.) • trend lines are not directly dependent on business activity, survey must be conducted in an attempt to explain the independence • Purpose of surveys is to establish the aspects of business activity on which the data communications usage will depend

  24. agenda • Current Traffic • Equipment Inventory and Forecasted Growth • Operational Evaluation Criteria • Network Design Decision Approach

  25. Operational Evaluation Criteria • Performance • Availability • Reliability • Cost • security

  26. Performance • Evaluate what performance criteria are necessary for acceptable operational characteristics of the network -response time -throughput -utilization -blocking rate

  27. Availability • Availability -reliability (MTBF) -serviceability (MTTR) • Serial-overall system availability

  28. Availability (cont.) • Parallel-overall system availability

  29. Reliability • Mean time between failures

  30. Cost • Line cost –recurring monthly service charges & nonrecurring one-time installation costs • Equipment cost • Software cost

  31. security • The most effective security measures involve a variety of barriers of different types and different places

  32. agenda • Current Traffic • Equipment Inventory and Forecasted Growth • Operational Evaluation Criteria • Network Design Decision Approach

  33. Network Design Decision Approach • Network design tool utilization • Cost-performance break-even analysis • Equipment acquisition

  34. Network design tool utilization • This step involved selection of the most appropriate design technique, acquisition of an NDT, development of a network model, and analysis of the model --most critical step of the entire network engineering process

  35. Network design phase

  36. Cost-performance break-even analysis • This step involved generating and evaluating alternative network designs • What-if questions are used to evaluate various alternative configurations -proposals for adding / deleting resources -redesign application to improve the performance -modeling different routing strategies

  37. Cost-performance break-even analysis (cont.) • Each of the various alternative configurations will have associated costs and performance levels • Trade-off between cost/performance

  38. Equipment acquisition • This step involves obtaining the necessary equipment as specified in the optimal optimized network design • Once this step is complete, an optimized implementable design is available as input into the next phase: network management

More Related