ITU-T Workshop on Bridging the Standardization Gap and Interactive Training Session (Cyberjaya, Malaysia, 29 June – 1 July 2010 ) Implementation of IPTV Content Delivery network and NG-CD Technology Yeong-il Seo, Director KT Network R&D Lab Cyberjaya, Malaysia, 29 June – 1 July 2010
Contents IPTV Content Delivery model Multicast deployment issues for IPTV Multicast VPN for IPTV P 2 P as Content Delivery technology P 4 P introduction as NG-CD Cyberjaya, Malaysia, 29 June – 1 July 2010 2
IPTV Content Delivery model IPTV Content Delivery Model Main: real time broadcast Main : Vo. D Real time broadcast channel service Native IP Multicast model • High Available, Qo. S guaranteed, Secure, Stable IPTV multicast network + Vo. D Alternative Multicast (Unicast) model • Server based • CDN based • P 2 P based Hybrid Model • Native IP multicast + Alternative multicast • Overlay multicast + + Next Generation Content Delivery Model ? Cyberjaya, Malaysia, 29 June – 1 July 2010 3
IPTV CD network architecture APT CO Vo. D (Hot source) HE router Vo. D IPTV Edge Small Aggregation SW (L 3) internet Customer side IGMPv 2 Big aggregation switch Advanced IP BB mcast access HE router BB IX, overseas, IDC IPTV Head. End Center Head. End MSDP PIM-SM layer features HE center/ ㅇ Bi-directional IPTV service, PPV service, Data broadcast service, VOD service, T-Internet/ T-Communication service Vo. D server farm BB (IP Premium) Access (aggregation SW) Small L 3 STB ㅇ Guarantee of Real time broadcast service stability : Qo. S guarantee, HA for Multicast network, Stable multicast routing, OAM, Multicast Security ㅇ IP address assignment and authentication ㅇ Multicast features & Qo. S enabled ㅇ Last mile device for PIM-SM/IGMP, Qo. S enabled ㅇIPTV data decoding, IGMP, Vo. D(D&P or Streaming), SD/HD, H. 264/MPEG 2/WMT Cyberjaya, Malaysia, 29 June – 1 July 2010 4
IPTV CD network requirement for implementation Advanced IP network technology in converged IP network High Quality TPS, especially PSTN emulation service over IP High Quality IPTV service with stable IP multicast technology Wibro service Multicast VPN, Managed L/L for enterprise customer Which advanced IP network technology are needed ? Cyberjaya, Malaysia, 29 June – 1 July 2010 One Network, Multi Services! 5
IPTV CD network deployment issue Design considerations for IPTV multicast Address High availability Qo. S Security Multicast Topology Multicast Addressing issues IANA allocation of class D address http: //www. iana. org/assignments/multicast-addresses For interoperable multicast channels, Should use ‘GLOP’ address. Globally routed private address : 233/8 How to use? : 233. 16 bit official AS #. 0/24 Ex) KORNET Case (AS number 4766) : 233. 18. 158. 0/24, Other AS number 5662 case : 233. 22. 30. 0/24 Site-local address : 239/8 Cyberjaya, Malaysia, 29 June – 1 July 2010 6
Design considerations for IPTV multicast : HA Other Unknown Why HA ? Link Failure u Time to Recover from Layer 1 failure u Congestion 9% 36% Router Operations 32% Congestion: 5% u Software Upgrade u Hardware Upgrade u Configuration Errors 23% Router Failures u Software failures Which HA features? u Hardware failures * Source: University of Michigan u DOS Attacks Multicast Traffic ready condition for whole PIM links The Use of Static IGMP Join, No service interruption from Link/Node failure No service interruption from PIM neighbor cutoff Fully redundant system architecture & topology Robust network against Any Do. S attacks ISSU Qo. S : Perfect provisioning, Diffserv for IPTV traffic and monitoring Cyberjaya, Malaysia, 29 June – 1 July 2010 7
Design considerations for IPTV multicast : Security Multicast security Critical issue for multicast network RP security RP : Group range filtering For example, except approved GLOP address for KT IPTV service (: 233. 18. 158. 0/24), whole other group range should be filtered in RP. PIM register message filtering : only approved source can register to RP MSDP SA filter : Limitation for SA information per MDSP peer, per source, per instance PIM router security Multicast Route limit To protect network against any kind of Worm attack via multicast routing update BSR message filtering PIM authentication among each neighbors TCP/ICMP message filtering for 224/4 Because only UDP traffic around 224/4 is used for IPTV service Last mile PIM router Filtering all multicast traffic except approved IGMP join messages ; Protection against multicast source spoofing Cyberjaya, Malaysia, 29 June – 1 July 2010 8
Design considerations for IPTV multicast : Topology Multicast Topology Optimal RP positioning ? RP position vs. Multicast traffic delay ? RP position vs. Multicast Stability ? Loop free, Delay/Jitter independent, stability guarantee topology Optimal position to exchange SA information amongst multicast service provider Tree topology case like KT, Best test result : HE=RP Optimal RP redundancy ? Dynamic RP vs. Anycast RP Multicast Traffic Load balancing issue Based on source IP, channels Cyberjaya, Malaysia, 29 June – 1 July 2010 9
Multicast VPN for IPTV & case study q With multicast VPN m Bidirectional e-learning/internal broadcasting service for VPN customer m Customized Advertisement service for Bank/Hospital/Gas station/Fastfood chain store/Department store/Government agency etc. q MPLS L 3 VPN case m Usually, Metro Ethernet, TDM access line m MPLS Label binding for multicast traffic is Not available. m With GRE, multicast traffic can be transmitted through each VRF’s MDT. q X 4 Biz(IPSec VPN) case m Usually, x. DSL access line m Also, IPSec cannot handle multicast traffic. m With GRE, multicast traffic can be transmitted through each IPSec tunnel. Ø GRE over IPSec Multicast over IPSec VPN PE * VPE : VPN Edge router Cyberjaya, Malaysia, 29 June – 1 July 2010 * PE : Premium Edge router 10
P 2 P Trends as Content Delivery Explosive increase of P 2 P traffic in ISP BB Good technology, but not so good impact on modern society Infringement of copyright : Free sharing of music & movie titles With P 2 P, Kids can easily access to pornographic/violent movies. P 2 P must be a major menace to Telco Explosive increase of P 2 P traffic force ISP’s CAPEX/OPEX increase. P 2 P based IPTV, So. IP, CDN User % 1% 27% 5% 49% 10% Cyberjaya, Malaysia, 29 June – 1 July 2010 Traffic rate 63% 20% 80% 11
Why Heavy User traffic increase ? q Why Heavy User traffic increase ? : Multi-flow unfairness issue m TCP fairness issue : In current IP network, Same Bandwidth per each TCP flow Ø Each flow’s BW= 1/total flow m By exploiting ‘TCP fairness issue’, such as P 2 P application, Ø Host, who is using P 2 P application, can generate bulk TCP flows and can monopolize bandwidth usage in some specific congested link. Ø Lifetime of P 2 P session is maintained until each file transfer is complete (minutes~hours), it can make normal users slowdown Host A 100 Mbps shared Link HTTP, FTP e-mail Host A P 2 P HTTP Host B q P 2 P over UDP case m UDP traffic injection in congested link TCP traffic : more serious performance degradation m More serious concern, a matter of time, go on increasing q Related article : http: //www. theregister. co. uk/2008/12/01/richard_bennett_utorrent_udp/ “Bit. Torrent declares war on Vo. IP, gamers!” Gamers, Vo. IP and video conference users beware. The leading Bit. Torrent software authors have declared war on you ~~~~~~~the developers of the u. Torrent P 2 P application have decided to make the UDP protocol the default transport protocol for file transfers. 12 Cyberjaya, Malaysia, 29 June – 1 July 2010
Impact & Menace of P 2 P technology as CD on Telco’s business Low-cost P 2 P based CDN solution Low price broadband subscriber line with P 2 P CDN solution Sales Loss of Telco IDC Big Menace to Telco’s TPS P 2 P based free/low cost So. IP solution, P 2 P over Wifi/Wibro/LTE Emergence of P 2 P based low cost/free Vo. IP solution such as Skype(out) Collapse of PSTN overseas call market, menace to Telco So. IP market P 2 P based low cost Vo. IP solution over wireless/mobile internet access menace to cellular communication market Wifi Direct, Wifi P 2 P direct P 2 P communication amongst Wifi terminal which has AP capability P 2 P based IPTV In CAPEX/OPEX perspective, by using of P 2 P based IPTV solution, Portal/OTT can have ‘cost competitive advantage’ comparing with Telco case. Easy free riding of Telco network, not necessary to deploy total IPTV network/server Cyberjaya, Malaysia, 29 June – 1 July 2010 13
cf. P 2 P based content delivery solution Cyberjaya, Malaysia, 29 June – 1 July 2010 14
P 4 P introduction as NG-CD P 4 P (Proactive network Provider Participation for P 2 P) Definition : Framework for ISP and P 2 P application to collaborate for the optimization of peer-to-peer connections Why P 4 P ? “Close & Optimal” peer selection for the performance increase of P 2 P application With P 2 P traffic localization, increase of ISP’s network efficiency and save of ISP CAPEX/OPEX Cyberjaya, Malaysia, 29 June – 1 July 2010 15
P 4 P introduction as NG-CD P 4 P component i. Tracker (ISP Portal Service) From ISP’s Network information i. Tacker is providing ‘optimal path and topology information’ to p. Tracker (Application Tracker, App. Tracker) Interworking with i. Tracker, p. Tracker is providing ‘optimal peer information’ to each P 2 P application Case study Comcast case (draft-livingood-woundy-p 4 p-experiences-02) Application download performance increase Overall P 2 P download performance : 15% increase Comcast internal P 2 P download performance : 50% ~ 80% increase P 2 P traffic localization effect Upload traffic : 34% decrease Download traffic : 80% decrease Cyberjaya, Malaysia, 29 June – 1 July 2010 16
IETF trend for NG-CD ALTO information export service P 2 P application service delivery optimization Application Level Traffic Optimization P 4 P: Provider Portal for P 2 P Applications) P 2 P traffic localization effect Application download performance increase NG-CD based on Routing Proximity Best path for content routing by using of ISP network information Routing info, BW info, Performance info from RTT/one-way delay Cyberjaya, Malaysia, 29 June – 1 July 2010 17
Q&A How to contact speaker? Tel : +82 -42 -870 -8333 E-mail : syi 1@kt. com Skype ID : syi 101 Cyberjaya, Malaysia, 29 June – 1 July 2010 18
Скачать презентацию ITU-T Workshop on Bridging the Standardization Gap and
de336c58d78a8057f34812b29b9087ef.ppt