A Broadband Network Management Practice: KT Internet

1. A Broadband Network Management Practice: KT Internet 2006.9.28 Jinhyoun Youn (jyoun@kt.co.kr) KT Network Strategic Group/ Internet Department

2. Contents • Brief History of KT Internet Service and NMS • KT Internet Management Systems Experiences • NeOSS-IP Core NMS • Performance Measurements • Traffic Analysis • Routing Information Management • New Features for Premium Networks • Future Directions

3. Brief History of KT Internet Service

4. Brief History of KT Internet NMSs • At the initial stage(~1996), primitive monitoring and fault management functions based on the production systems like Openview or CiscoWorks were the main usage of Internet NMS • As the network grew, in-house software were much more preferred and KOSMOS(Kornet Service Managements and Operation Support systems,1996) was the first integrated style Internet NMS for KT. Simple monitoring functions were expanded to reacheability and availability management • As the portion of the Internet (and data networks) grew in the revenue, the interoperability with other infrastructure (espeially the main telco infrastructure) got much more important, and NEOSS-IP was confronted in 2002. Various Measurements and analysis were added.

5. KT Internet Service and Mgmt • NeOSS-IP and its sub systems • CORE-NMS, Premium NMS, Multicast NMS, • Access NMS • Analysis Systems

6. NeOSS-IP and its Subsystems • NeOSS-IP is an NMS system for IP networks in KT NeOSS systems • NeOSS-IP includes subsystems for operation tools like • Traffic, Performance, RIB analysis systems • Configurations, Remote Operations support tools

7. Performance Measurements • IPAS(Internet Performance Analysis System) • As a start point of service level (quality) managements • Like sorts of network weather systems • UDP/TCP active measurements over thousands of paths per minutes using probes (special-purposed routers) • Focus on UDP and jitter delay and loss rather than simple ICMP stuffs

8. Performance Measurements(2) • What we can learn from IPAS • General Packet Transmission or IP Service Quality Levels over the backbone networks • Abrupt packet transmission delays due to events on the backbone networks

9. Traffic Analysis • Three ways of Traffic Understanding • General traffic volume analysis using CORE-NMS • Traffic flow analysis using routers and IP-FLOW system • Traffic Packet Analysis using PACAS(Packet Characteristics Analysis system)

10. Traffic Analysis (2) • What we can learn from CORE-NMS • The total traffic volumes over KT backbone, overseas, IX networks • The link utilizations • What we can learn from IP-FLOW • The general trend of the traffic usage ex. per applications(ports), per ASN, per POPs/Access services and so on

11. Traffic Analysis (3) • What we can learn from PACAS • The analysis results can be used directly for engineering • Illegal packets with wrong IPs • DDOS packets • Out-of-Sequence/Order ratio and so on • Packet Level Characteristics • PDF of Packet Arrivals • Traffic volumes at tiny time units(micorseconds units) • Microscopic version of data which we can get from IP-Flows i.e. per ports/IP Addrs/ASN traffic distribution and so on

12. Routing Information Management • IRIMS(IP Routing Information Managements System) • Routes(Prefixes) changes archives • Realtime change monitoring supported • Routing Daemons and SNMP are used together

13. Routing Information Management(2) • What we can learn from IRIMS • Real time routing information change monitoring • BGP Session and prefix changes monitoring • ISIS links changes monitoring • FLAPS and routing process overloads • Inconsistent AS

14. New Features for Premium Networks • MPLS managements • New elements for MPLS: LDP, LSP, LIB, MPLS IFs and Tunnels • Dynamic LSP managements • MPLS-TE Prototypes • QoS Managements • New elements for QoS(DIFF_SERV) : Queues and policies • DIFF_SERV management with backbone policy server • Per class Traffic, Delay, Jitter, Loss • Per Tunnel Traffic • Multicast Managements • New elements for Multicasts: Multicast tunnels, RPs, Ifs, • IGMP, PIM_SM, MSDP Management

15. Near Future: Beyond Broadband • Service Needs • More bandwidths • Various access technology • Personalization • Convergences in services • BCN Service Concepts Broadband Convergence Network high-quality broadband multimedia services Integrating telecom, broadcasting, and Internet seamlessly at anywhere, anytime, and using any devices KEYWORDS: QoS, IPv6, MPLS, IMS, Convergence

16. BCN at the moment • BcN(backbone network-the premium network) has been deploying since 2005 • DIFFSERV for the basic backbone CoS • MPLS for the enhanced availability • Packetized Voice, IP-TV, and Wibro on the premium network • CoS applied for service classes • BcN Service Infrastructure including various control mechanisms will be implemented soon • IMS based service control systems: Resources and Services(Session) • Large-scale user(subscribers) handling features

17. NMS Expectations • The volumes, numbers, core-technologies of the networks will be continuously increasing • The underlying network functions and the services will be tightly coupled and the layering conventions will be ambiguous AS IS • BROADBAND and its components have been the main NMS objects so far • Mainly networks, elements, and facilities are main concerns for NMS To Be • Ubiquitous service and convergence might be regarded as the next theme • End-to-end application/service supports will be the next concerns

18. Concluding Remarks : What we will do • Even though the underlying technologies or networks is expected to be more complex, the NMS and its view for operators should be simpler: Integrated but selectable(and flexible) user interfaces • On the shared platforms, the interoperability between NMS systems for various networks/services should be achieved. • To support convergence trends, the unified platform for supporting customers will be more important.