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Large-Scale WAN Design

Large-Scale WAN Design. 0501_11F8_c1 NW97_EMEA_111. 1. Business Requirements. Cost reduction Voice and data consolidation Maximize network control Manage SP Service Agreements Build Private network Increase efficiency You pay for BW in the WAN, use it right. PBX. Data. Voice. Video.

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Large-Scale WAN Design

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  1. Large-Scale WAN Design 0501_11F8_c1 NW97_EMEA_111 1

  2. Business Requirements • Cost reduction • Voice and data consolidation • Maximize network control • Manage SP Service Agreements • Build Private network • Increase efficiency • You pay for BW in the WAN, use it right

  3. PBX Data Voice Video • Interactive • File transfer • Multiprotocol • http://www • Interoffice PBX • Fax • Modem • Quality • Distance learning • Teleconferencing • Multicast • Quality Traffic

  4. Traffic Mix Spectrum 100%Data Mix 100%Voice Services Real-Time Apps IP over LL FR PPP ATM (cell) IP FR TDM ATM Voice Video FAX Call Center WEB interactive SNA Non Real-Time Apps Voicemail store/forward FAX FTP

  5. 9.6K 56/64K E1/T1 E3/T3 OC3 OC12 OC192 Bandwidth in the Wide Area POS Your Options Will Vary ATM Frame Relay Leased Line X.25

  6. CPE CPE Switch/Router CPE CPE CPE CPE CPE CPE Public vs. Private Networking Where the Services are Performed Public Hybrid Private Public Basic Hybrid (Public Value Added) Private

  7. Switch/Router CPE CPE PBX PBX Campus Campus Public Internet PSTN Public WAN • Customer owned CPE • Switching in cloud • Services • The Internet (IP) • Public ATM • Frame Relay • X.25 service • PSTN • Statistically shared network infrastructure

  8. Switch/Router CPE CPE Frame Relay or X.25 PSTN / ISDN Public: Hub and Spoke Design Frame Relay, X.25 Service, PSTN and ISDN Cost-Usage Based • Low cost of bandwidth • Low cost of management • Reliability and availability provided by the network Cost-Medium Low • Readily available • Flexible topology • Reliability and availability provided by the network

  9. Switch/Router CPE CPE PBX ATM PBX Public: ATM • Variable bandwidth-T1/E1 and above • Guaranteed QoS • Reliability and availability provided by network Cost High, Expected to Fall

  10. CPE CPE CPE PBX PBX Campus Campus Wire/Fibre Private WAN • Customer owns cloud, rents wire/fibre only • CPE Switching • Connection Services • Leased Lines • Dark Fiber • Satellite • Own network infrastructure

  11. CPE CPE CPE Private: Router Network Leased Lines • Predictable bandwidth • Good control over delay • Management and deployment costs Cost- Fixed, High

  12. CPE CPE CPE Private: Switch Network Cell, Frame Relay or X.25 • Very predictable bandwidth • High control over delay • Scalability needs SVCs • Management and deployment costs Campus PBX PBX Cost- Fixed Monthly, High Cost of Ownership, Save on PSTN Charges

  13. PBX Campus Internet Hybrid WAN (Public Value Add) • Cloud extends to CPE • Services • Managed services • Virtual Private Network • Network appears as private network • Statistically allocated BW

  14. PBX Campus Hybrid: SP Managed Services • SP Services • SVCs, Reliability, Availability • Configs, Reporting, Maintenance • Enterprise provides • Security (encryption, L2TP, AAA) RSVP Cost -Varies (Competition), Decrease Costs - Consolidate Voice

  15. Variable bandwidth Variable delay Requires high levels of security Predictable bandwidth, delay QOS w/CAR (IP precedence) Requires high levels of security Hybrid: Public Internet—VPN Internet Basic Cost- Fixed, Low Enhanced Cost- Fixed, Plus QOS Premium

  16. CPE CPE CPE IWF IWF Hybrid: Public ATM PBX • Same as Basic Services • Service (voice)Interworking between FR, PSTN (IWF) • SVC services • Reliability and availability provided by the network ATM Frame Relay PSTN/ISDN Cost - Medium / High, but Save on Long Haul PSTN

  17. Inherent WAN Network Features Public Private Hybrid Recurring Costs Wire Buy equip People cost High Recurring costs +enhancements Cost Equipment Low High Low High but Bundled Wire High Low Low BW control by SP Uncertain availability shared by large customer base High 100 your BW 99.9 availability control all traffic Lowest Service agreement enforcement req’d Control

  18. Layer 3 WAN Layer 2 WAN Branch Branch FRAD FRAD Mobile SOHO FRAD Branch Branch Branch WAN Core WAN Core SOHO Public ATM, T3/E3, T1/E1 Branch SOHO Distribution FRAD Distribution Branch Mobile Branch Branch Access Access WAN Hierarchical Design

  19. Router-Based WAN Branch • Multiprotocol (L3) • IP, IPX, AT, DEC, etc. • Data mostly • Client/server • Legacy IBM • Web traffic • Some voice (emerging) • VoIP, VoFR Mobile SOHO Branch WAN Core SOHO Public SOHO Distribution Branch Mobile Access

  20. Router WAN Core • Public net connections • Frame Relay, ATM, Leased, X.25 • Full/partial mesh • Redundancy, BW +, robust • Efficient feature use • Use fastest switching path Public FR, ATM,Leased Mesh Formula: n x (n-1) 2

  21. Distribution to Core Connection • Redundant connect • Separate COs, parallelism • Route summarization • OSPF • Separate areas/AS • SAP filtering Distribution WAN Core

  22. Distribution to Access Connection Access • Branch connection • Frame, leased, ISDN, X.25 • Permanent backup • Small/home office • ISDN, Frame, X.25, Dial • Dial backup, analog phone • Mobile • PPP, DHCP, security Distribution Branch Mobile Core SOHO Branch

  23. Router WAN Considerations • Layer 3 addressing • Routing protocols • Backup/redundancy • Provisioning public services • Scalability • Features

  24. Routing Protocols: OSPF • Good for partial mesh NBMA networks • Too many link-state updates in full mesh • OSPF guidelines: • Routers per area: 40–50 • Use of STUB areas: external routes not advertised • Use of NSSA: allows limited external route import • OSPF on-demand circuit (rfc1793): reachability presumed • For ISDN, X.25 SVCs, and dialup-->usage sensitive

  25. Switched-Based WAN Branch • Multiservice (Layer 2) • ATM, Frame Relay (interworking), X.25, voice, circuit switching (TDM replacement) • Traffic consolidation • Data, voice, video, • Private network • Reduce costs, increase control and flexibility, better quality, security, and availability FRAD FRAD FRAD Branch Branch WAN Core ATM,T3/E3,T1/E1 Branch FRAD Distribution Branch Branch Access

  26. Switched WAN Core WAN Core ATM, T3/E3, T1/E1 • Full/partial mesh • Redundancy, increased BW • Know traffic patterns • Will traffic takepreferred paths • Trunk speeds and feeds • Size in fail-over capacity

  27. Core to Distribution Connection • Extends switch core • Scalability, connectivity • Redundant connections • Use separate CO facilities Distribution Core

  28. PBX Distribution to Access Connection Access • Frame Relay UNI • FRAD, router • Frame Relay NNI • Public Frame Relay • Frame Relay trunk • Remote Switch concentrator • Circuit switch I/F • PBX (voice) andCircuit emulation PBX FR UNI FRAD Distribution 3174 Core Trunk PBX 3800 DACS PBX CSU FR NNI PBX FR FR UNI (FF) X.25

  29. PBX PBX PBX PBX PBX Multiservice Network DS1 DS3 ATM OC-3 Crop. Data Network DS1 OC-3 DS3 ATM OC-3 DS3 DS1 DS1 DS3 DS3 • Voice, data, andvideo services • Major sites, dispersed HQ • Quality of service • ATM, OptiClass • Congestion control • ForeSight OC-3 OC-3 DS3 OC-3 DS1 DS3 OC-3

  30. PBX Trends: Consolidation PBX PBX Public Voice PSTN or VPN PBX Private Line Voice and Data T1 Public Data PSTN or VPN Decreasing Total Cost Need for Speed Need for QoS/CoS Consolidation/ Maximization Multiservice Carrier Network Private Line Narrowband ATM Broadband ATM

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