1. whchang@bora.net ISP 를 위한 초고속망 구축기술 1 ISP 를 위한 초고속망 구축 기술 장우현 whchang@bora.net 데이콤 EC 인터넷사업본부 보라넷팀

2. whchang@bora.net ISP 를 위한 초고속망 구축기술 2 Topics LAN WAN Server System Traffic Caching *Access Network (home-to-ISP), Monitoring, Accounting 은 다루지 않았음

3. whchang@bora.net ISP 를 위한 초고속망 구축기술 3 LAN parts Bandwidth 의 변화 –Shared 10Mbps –Switched 10Mbps –Shared 100Mbps –Switched 100Mbps –Switched 2Nx100Mbps –Switched 1Gbps –Shared N x Gbps

4. whchang@bora.net ISP 를 위한 초고속망 구축기술 4 BORANet Router Port 의 Bandwidth Usage 변화

5. whchang@bora.net ISP 를 위한 초고속망 구축기술 5 High Speed LAN Solutions 100Mbps FDDI 100Mbps FastEthernet ATM LAN Emulation FastEtherChannelFastEtherChannel –2^N x FastEthernet Gigabit Ethernet InterfaceGigabit Ethernet Interface IP Ring (Gigabit)IP Ring (Gigabit)

6. whchang@bora.net ISP 를 위한 초고속망 구축기술 6 FastEtherChannel 2^N x FastEthernet (N = 1,2,3) –Router Switch –Switch Switch –Logical One Interface – 여러업체에서 지원 MAE-WEST, PAIX, DACOM BORANetMAE-WEST, PAIX, DACOM BORANet 등에서 이용 800M400M200M

7. whchang@bora.net ISP 를 위한 초고속망 구축기술 7 Gigabit Ethernet Interface Most of the famous vendors are providing the Gigabit Interface –‘98 년중부터 출시됨 –Cisco, 3Com,.... –Alteon, Foundry,... FastEtherChannel 보다 성능, 확장성, 비용면에서 유리 –FasEtherChannel 은 Gigabit Interface 로 가기 위한 Interim Solution Gigabit Interface 로 바로 전이하는 것이 바람직 – 가능하다면 100M Interface 에서 Gigabit Interface 로 바로 전이하는 것이 바람직

8. whchang@bora.net ISP 를 위한 초고속망 구축기술 8 IP Ring Shared Gigabit Ring Wide Area(Wide Area) Local Area Network –Same Network Address based on SONET/SDH FDDI 100Mbps 한계를 벗어남 IP Ring will come to us Soon! 서울 수원 안양 Gigabit Ring based on SONET/SDH 10.0.0.1 10.0.0.3 10.0.0.2

9. whchang@bora.net ISP 를 위한 초고속망 구축기술 9 WAN Parts Bandwidth 의 변화 –9.6/56/64Kbps –Fractional T1/E1 –T1/E1 –T3 –OC3/STM1 (155M) –OC12/STM4 (620M) –OC48/STM16 (2.48G)

10. whchang@bora.net ISP 를 위한 초고속망 구축기술 10 DACOM KT 간 Bandwidth 변화

11. whchang@bora.net ISP 를 위한 초고속망 구축기술 11 High Speed WAN Solutions ATM Packet Over SONET/SDH

12. whchang@bora.net ISP 를 위한 초고속망 구축기술 12 POS (Packet Over SONET/SDH) native formatA 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. whchang@bora.net ISP 를 위한 초고속망 구축기술 13 Benefit of POS High utilization of WAN bandwidth 98% utilization –Packet over SONET provides 98% utilization Ether Size (Byte) SPE Eff. % POSATM 641282565121024151820484352448886.8949798.699.399.599.699.899.8436975858688898989

14. whchang@bora.net ISP 를 위한 초고속망 구축기술 14 Which One? POS or ATM IP CentricConsider IP over SONET/SDH when business model or majority of traffic is IP Centric multiple servicesConsider ATM for aggregation of multiple services on a common transmission infrastructure

15. whchang@bora.net ISP 를 위한 초고속망 구축기술 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 STM1  1 x STM1  2 x STM1  1 x STM4

16. whchang@bora.net ISP 를 위한 초고속망 구축기술 16 Server System Parts One Big Machine: No way Multiple Machine –Use Multiple Machine –to serve the large and bursty traffic Server RackServer Rack DNS Servers Web ServersVideo Servers

17. whchang@bora.net ISP 를 위한 초고속망 구축기술 17 Share the Disk Storage Dedicated NFS Server SystemDedicated NFS Server System 이용 –Hot Swappable Disk without Setup –High Speed I/O Operations –Multiple Fast Interfaces

18. whchang@bora.net ISP 를 위한 초고속망 구축기술 18 Server Load 분산 DNS Round-Robin 이용한 load 분산 Layer 4 SwitchLayer 4 Switch 이용한 load 분산 –Application port number 를 보고 분산시킴 –DNS, Web, Telnet, FTP, NNTP, etc. ip: 10.0.0.1 port: 23 10.0.0.2 session 10 개 10.0.0.3 session 10 개 10.0.0.4 session 9 개 Layer 2 Switch Layer 4 Switch

19. whchang@bora.net ISP 를 위한 초고속망 구축기술 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. whchang@bora.net ISP 를 위한 초고속망 구축기술 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 2~3 개월안에 회수 가능 DNS Request Caching –improve the response time

21. whchang@bora.net ISP 를 위한 초고속망 구축기술 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. whchang@bora.net ISP 를 위한 초고속망 구축기술 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. whchang@bora.net ISP 를 위한 초고속망 구축기술 23 Challenges of IP Network Accounting Class of Services Quality of Services High-Speed Switching VPN provided by the service provider’s network