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Routing at CP HotelsThe following diagram indicates the routing design.Data Center AServer Farm ModuleOSPFMainframe & website DMZ also located here (not shown)x 8Internetx 8EBGPCoreAggregation Access Rows of racks of serversHotels ModuleCoreIBGPAggregation (4 pairs)4 OSPF AS’sAccess (4 groupsof 4, 16 total)FrameRelayTo 2000hotelsCall Center ModulePartner ModuleCorporate Internet AccessEBGPStatic routingStatic routingMPLSVPNPartnersVariousconnectionmethodsInternetHQ ModuleHQ 1 & 2OSPFHQ 3 & 4Data Center B(Identical layout)14 Designing Cisco Network Service Architectures (ARCH) v2.0 © 2007 Cisco Systems, Inc.
The routing design uses external Border Gateway protocol (EBGP) to isolate routing in thevarious modules. Most modules use Open Shortest Path First (OSPF) within the module. Eachmodule has a different private BGP autonomous system (AS) number, to simplify writing BGPpolicy rules. The module pair of routers uses EBGP to the two core routers in each data center.Each module router peers with both core routers in its data center. The two data center corepairs each have different BGP AS numbers and also use EBGP to the other data center pair.Each module router pair redistributes the relevant Interior Gateway Protocol (IGP) into BGP.Default is injected into the IGP in each module, so that default points to the core (which thenroutes to the dedicated Internet links).Server Farm ModuleThe Server Module uses OSPF. OSA on the mainframe is isolated behind dedicated Cisco 7300Series model routers, in their own totally stubby area, to isolate the mainframes from routechanges.Server Farm ModuleOSPFMainframe & website DMZ also located herex 8Internetx 8CoreAggregation Access Rows of racks of serversHotel ModuleThe Hotel Module uses EBGP between its core-facing edge routers and the core. It uses IBGPbetween those routers and the aggregation routers. The aggregation routers summarize OSPFinto the IBGP. They are connected to OSPF area 0, but each pair of aggregation routers uses alogically separate OSPF area 0 for its Region. This keeps route changes from a Region frompropagating into the other Regions, and corresponds the fact that hotel to hotel traffic is notallowed.Hotels ModuleCoreIBGPAggregation (4 pairs)4 OSPF AS’sAccess (4 groupsof 4, 16 total)FrameRelayTo 2000hotelsThe 4 access routers in a Region act as Area Border Routers, summarizing their areas into theRegion’s area 0. Each access router uses one area for every 32 sites it connects to.© 2007 Cisco Systems, Inc. Lab Guide 15
Page 1 and 2: ARCHDesigning Cisco NetworkService
Page 3 and 4: Table of ContentsLab Guide 1Overvie
Page 5 and 6: ARCHLab GuideOverviewThis guide pre
Page 7: MegaCorp Campus Case Study Scenario
Page 10: 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: Note128 x 256 Kbps is approximately
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 and 64: Step 5 High Level Storage Design•
Page 65 and 66: • DS-MRI would also need to ident

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