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Step 9 High Level VoWLAN Design• The main impact is on the wireless site survey and access point placement. Using LWAPPand controllers keeps the impact on the design minimal: controllers would probably beattached to wing or building switches, depending on how many are needed.— The Location Appliance requirement suggests placing access point s in corners andon building edges, using directional antennas. Internal access point s could then beadded as needed to achieve the appropriate cell sizes and access point densities tosupport Location triangulation and VoWLAN coverage. Since edge and corneraccess point s only cover ¼ or ½ a circle, they add to the access point count.— Using the 3000 square foot per access point figure for a first approximation to thenumber of access point s, then each wing floor would require 20,000 / 3,000 = 7access point s, or more. The 200 users would thus be divided into up to 30 per accesspoint. If they all need to use wireless simultaneously, you would need to deployadditional collocated access points on different channels.— If one knows the floor dimensions, say 100 feet by 200 feet, one can then do a littlemore careful estimation and initial access point placement. This level of detail wouldbe appropriate for a real customer, but is too time-consuming to do in this casestudy.— Each wing would then need 6 x 7 = 42 access points (or more). So one approachwould be to use a 50- access point controller per wing, with fallback to a sparesomeplace else.— Do not forget to include WCS and Location Appliance(s) to manage the WLAN Toestimate the number of Location Appliances, one needs to know what or who isbeing tracked.— Location Appliance coupled with wireless phones would permit locating staff orequipment. On the other hand, tracking staff locations might raise privacy concerns.Step 10 Network Management Design• NetFlow could be used to track traffic volumes and do cost allocation. It would be bestapplied inbound on interfaces in the traffic path. If most traffic will be data center todesktop, NetFlow might be used at the building or wing distribution layer. Note that thiswould miss some localize IP phone or desktop to desktop traffic.• IP SLA could be used to provide the desired information about the WAN. This may be oflimited value for Internet connections, since there is little that can be done to improve onpoor conditions.— IP SLA would most likely be done between the remote router and central siterouters.— As the number of remote connections increases, it might be wise to offload thecentral IP SLA responder role to dedicated routers.— IP SLA should not be needed within the campus or datacenter. However, some toolsshould be used to identify duplex or speed problems with links, and Spanning Treeor routing instability in the network, as all would cause performance problems withtraffic across the campus.60 Designing Cisco Network Service Architectures (ARCH) v2.0 © 2007 Cisco Systems, Inc.
• DS-MRI would also need to identify tools that are:— Cost-effective— Scale to the desired scale— Reasonably easy to manage and use— Produce good reports with the desired information© 2007 Cisco Systems, Inc. Lab Guide 61
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ARCHDesigning Cisco NetworkService
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Table of ContentsLab Guide 1Overvie
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ARCHLab GuideOverviewThis guide pre
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MegaCorp Campus Case Study Scenario
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MegaCorp Campus Design TasksComplet
Page 13 and 14: Case Study 2: CP Hotels Addressing
Page 15 and 16: The following diagram illustrates t
Page 17 and 18: Note128 x 256 Kbps is approximately
Page 19 and 20: The routing design uses external Bo
Page 21 and 22: Addressing at CP HotelsHQ buildings
Page 23 and 24: CP Hotels Design TasksComplete thes
Page 25 and 26: Case Study 3: CP Hotels Network Ini
Page 27 and 28: Series switches use HSRP and EIGRP
Page 29 and 30: Step 3 (E-Commerce Redesign Stateme
Page 31 and 32: Case Study 4: CP Hotels Security an
Page 33 and 34: The following diagram indicates the
Page 35 and 36: The data centers will be connected
Page 37 and 38: Step 2 Review the CP Hotels design
Page 39 and 40: Case Study 5: DS Medical Research I
Page 41 and 42: DS-MRI Design TasksComplete these s
Page 43 and 44: Activity VerificationYour group has
Page 45 and 46: Answer KeyThe recommended solutions
Page 47 and 48: uplinks, since the speeds on the up
Page 49 and 50: Case Study 2 Answer Key: CP Hotels
Page 51 and 52: Another option uses 3 bits for desi
Page 53 and 54: Case Study 3 Answers: CP Hotels Net
Page 55 and 56: Step 3 E-Commerce Refresh• For th
Page 57 and 58: Case Study 4 Answer Key: CP Hotels
Page 59 and 60: Step 2 CP Hotels Security• The to
Page 61 and 62: Case Study 5 Answer Key: DS Medical
Page 63: Step 5 High Level Storage Design•
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