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ISP 를 위한 초고속망 구축 기술

ISP 를 위한 초고속망 구축 기술. 장우현 whchang@bora.net 데이콤 EC 인터넷사업본부 보라넷팀. Topics. LAN WAN Server System Traffic Caching Access Network (home-to-ISP), Monitoring, Accounting 은 다루지 않았음. LAN parts. Bandwidth 의 변화 Shared 10Mbps Switched 10Mbps Shared 100Mbps Switched 100Mbps

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ISP 를 위한 초고속망 구축 기술

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  1. ISP를 위한 초고속망 구축 기술 장우현 whchang@bora.net 데이콤 EC인터넷사업본부 보라넷팀

  2. Topics • LAN • WAN • Server System • Traffic Caching • Access Network (home-to-ISP), Monitoring, Accounting 은 다루지 않았음

  3. LAN parts • Bandwidth의 변화 • Shared 10Mbps • Switched 10Mbps • Shared 100Mbps • Switched 100Mbps • Switched 2Nx100Mbps • Switched 1Gbps • Shared N x Gbps

  4. BORANet Router Port의 Bandwidth Usage 변화

  5. High Speed LAN Solutions • 100Mbps FDDI • 100Mbps FastEthernet • ATM LAN Emulation • FastEtherChannel • 2^N x FastEthernet • Gigabit Ethernet Interface • IP Ring (Gigabit)

  6. FastEtherChannel • 2^N x FastEthernet (N = 1,2,3) • Router <-> Switch • Switch <-> Switch • Logical One Interface • 여러업체에서 지원 • MAE-WEST, PAIX, DACOM BORANet등에서 이용 200M 800M 400M

  7. Gigabit Ethernet Interface • Most of the famous vendors are providing the Gigabit Interface • ‘98년중부터 출시됨 • Cisco, 3Com, .... • Alteon, Foundry, ... • FastEtherChannel 보다 성능, 확장성, 비용면에서 유리 • FasEtherChannel은 Gigabit Interface로 가기 위한 Interim Solution • 가능하다면 100M Interface에서 Gigabit Interface로 바로 전이하는 것이 바람직

  8. IP Ring • Shared Gigabit Ring • (Wide Area) Local Area Network • Same Network Address • based on SONET/SDH • FDDI 100Mbps 한계를 벗어남 • IP Ring will come to us Soon! 수원 10.0.0.3 서울 10.0.0.1 Gigabit Ring based on SONET/SDH 10.0.0.2 안양

  9. WAN Parts • Bandwidth의 변화 • 9.6/56/64Kbps • Fractional T1/E1 • T1/E1 • T3 • OC3/STM1 (155M) • OC12/STM4 (620M) • OC48/STM16 (2.48G)

  10. DACOM <-> KT 간 Bandwidth 변화

  11. High Speed WAN Solutions • ATM • Packet Over SONET/SDH

  12. POS (Packet Over SONET/SDH) • A high-speed WAN transport that leaves LAN traffic in its native format • Packet-Over-SONET/SDH is the serial transmission of data over SONET frames through the use of Point-to-Point Protocol (PPP) • RFC 1619, PPP over SONET/SDH • RFC 1662, PPP in HDLC-like Framing

  13. Benefit of POS • High utilization of WAN bandwidth • Packet over SONET provides 98% utilization POS ATM EtherSize(Byte) SPEEff.% SPEEff.% 64 128 256 512 1024 1518 2048 4352 4488 86.8 94 97 98.6 99.3 99.5 99.6 99.8 99.8 43 69 75 85 86 88 89 89 89

  14. Which One? POS or ATM • Consider IP over SONET/SDH when business model or majority of traffic is IP Centric • Consider ATM for aggregation of multiple services on a common transmission infrastructure

  15. BORANet Backbone • T3 now • We are considering the POS for the national and int’l backbone • DACOM BORANet <-> KT KORNET • T3 x 3 now -> POS • 1 x STM1 • 2 x STM1 • 1 x STM4

  16. Server System Parts • One Big Machine: No way • Use Multiple Machine • to serve the large and bursty traffic • Server Rack DNS Servers Video Servers Web Servers

  17. Share the Disk Storage • Dedicated NFS Server System이용 • Hot Swappable Disk without Setup • High Speed I/O Operations • Multiple Fast Interfaces

  18. Server Load 분산 • DNS Round-Robin이용한 load 분산 • Layer 4 Switch이용한 load 분산 • Application port number를 보고 분산시킴 • DNS, Web, Telnet, FTP, NNTP, etc. ip: 10.0.0.1 port: 23 Layer 4 Switch 10.0.0.2 session 10개 10.0.0.3 session 10개 10.0.0.4 session 9개 Layer 2 Switch

  19. Off-the-Topic • Don’t consider only SUN, HP, DEC, .... • They are expensive. • We can buy the systems having same performance and quality with SUN, HP, DEC at half-price

  20. Traffic Caching • Web Traffic Caching • save the cost for WAN connection • improve the performance at the user-view • upto 50% hit ratio • Most of Korea ISPs are caching the traffic to save the int’l circuit • 투자비를 2~3개월안에 회수 가능 • DNS Request Caching • improve the response time

  21. Traffic Caching (cont.) • Many ISPs in the world are installing the cache-farms at their POPs. San Francsico New York Dallas cache -farm cache -farm cache -farm

  22. Traffic Caching (cont.) • Web Caching Servers • Inktomi, Netcache, Cisco Cache, CacheFlow, ... • L4 Switches • Alteon, Foundry, RAD, ... • Gigabit Interface 지원 • Layer2 Switch 로 기능으로도 뛰어남

  23. Challenges of IP Network • Accounting • Class of Services • Quality of Services • High-Speed Switching • VPN provided by the service provider’s network

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