SLA QoS 2002. 12. 13 Email: really97@postech.ac.kr
QoS QoS SLA POS-SLMS (-Service Level Monitoring System)
SLA (Service Level Agreement) SLA SLA TM Forum SLA QoS QoS SLA
SLA QoS QoS SLA POS-SLMS ( Service Level Monitoring System)
SLM (Service Level Management) Business Level Management Customer Customer Interface Management Service Level Management SLA Creation SLA Assessment SLA Negotiation SLA Reporting SLA Provisioning SLA Maintenance SLA Monitoring Network Level Management -SLM7 -
SLA QoS QoS Parameters SLA SLA Contract Problem Notification Performance Data Data SLA Monitoring Network Monitoring Methods
SNMP
Internet2, NIMI, NLANR, CAIDA, IPPM, Surveyor ICMP TCP/UDP / IPMP ( IP Measurement Protocol )
SLA - WorldCom Service Name: Private Label DSL (Access) SLA QoS Parameters in SLA Network Availability Network Latency Data Delivery Mean Time To Restore Guaranteed Avg. 99.7% Avg. 30ms Avg. 95% 24hrs-Premium Degree 48hrs-Basic Measuring Periods A month 4-hour intervals for 5 consecutive days 4-hour intervals for 5 consecutive days A month Measuring Points From DSLAM to WorldCom s ATM switch From WAN interface of end user (CPE) to WorldCom s ATM switch From WAN interface of end user (CPE) to WorldCom s ATM switch From WAN interface of end user (CPE) to WorldCom s ATM switch Credits 10% of the MRC 10% of the MRC 10% of the MRC 10% of the MRC
SLA - WorldCom Measuring Methods Network Availability Network Latency Data Delivery MTRS (Mean Time to Restore Service) (TotalNo.DSL Circuit* TotalMinutesInMonth) - ( TotalMinutesDSL CircuitOutagesInMonth) Circuits* TotalMinutesIn Month The time it takes for 64 byte packet to traverse from the WAN interface of a customer s DSL CPE. First measurement is the NMC-to-CPE network delay by PING test. Second measurement is the NMC-to-MSC network delay by PING test. (NMC-to-CPE Delay - NMC-to-MSC Delay) /2 NMC: Network Management Center MSC: Metro Service Center A minimum of 100 packets per measurement to ensure statistical validity. The average data delivery is then calculated as the mathematical average of all measurements WorldCom is committed to restoring DLS service within certain periods of time based on the severity of the problem in addition to whether single or multiple clients are affected.
SLA 4 ro 1Mbps, Light 500kbps, AS 1, 24 AS, 3 3. KT Hanaro Telecom Thrunet Onse Telecom / RTT, /, Ping Error Rate Meg@Feel, / RTT, /,. / RTT, /,,.(., Real-time streaming data..(, Real-time streaming data. SLA Meg@Feel Program SLA Web Page Load Test Visual Traceroute SLA KT DSLAM Meg@Feel End to End 60 10 KT KT KT 60% 1.. KT Visual Traceroute. Meg@Feel SLA SLA. SLA. SLA SLA. SLA. SLA...
MTRS ( ) QoS Availability ( ) Delivery ( ) QoS Parameters Latency ( ) Bandwidth ( ) MTBF ( )
(NPM) NPMs Availability Loss Delay Utilization Connectivity Functionality One way loss RT loss One way delay RTT delay Delay variance Capacity Bandwidth Throughput
QoS,,, QoS
Q={q1, q2, q3, q4} : a set of QoS Parameters N={n1, n2, n3, n4, n5, n6} : a set of NPMs 2 N : the power set of N E={e1, e2, e3, e4, } : a set of Evaluation Functions => m(x) : Measurement Mapping => n(x) : Evaluation Mapping Q q1 q2 q3 q4 QoS Parameter m(x) 2 N. {n1,n2} {n2, n3}. {n4}. {n5,n6}. NPM n(x) E e1 e2 e3 e4 e5.. Evaluation Functio For each element in N, H, I, J and K should be considered => m(x): N (H, I, J, K) N NPM (N1,N2,N3,N4) H I J K Monitoring Method (A,P,S) Monitoring Point Monitoring Period Agent Type (aa, na, ta, sa)
QoS Parameters NPMs Availability Delivery Latency Bandwidth MTBF MTRS Availability Loss Delay Utilization Connectivity Functionality One way loss RT loss One way delay RTT Delay Delay variance Capacity Bandwidth Throughput
QoS NPM Availability Connectivity 100 * 100 (%) Functionality 100 *100 (%) Delivery Latency Bandwidth One way Loss RT Loss One way Delay RT Delay Delay Variance Throughput ( ) ( ) 100 *100(%) ( ) ( ) 100 *100(%) timestamp - timestamp timestamp - timestamp N 1 ( i RTT ( N ) i= 1 RTT 2 )
SLA Related SLM Components Customer Business System SLA Maintenance System Reporting System Billing System Service Planning and Development Reporting Manager Problem Manager Data Store Parameter Mapper Customer SLA Performance Analyzer Map DB PM Collector PM Collector PM Collector Customer SLA module SLA Agent SLA Agent SLA Agent Monitoring module SLA Agent SLA Agent Parameter Mapper module
POS-SLMS(-Service Level Monitoring System) Gigabit Ethernet Backbone Network : IP PC : OS : Linux Redhat 7.3 10/100 Ethernet card CPU : Pentium-III 800 MHz RAM : 256 MB : C/PHP
POS-SLMS 141.223.180.22 POS-SMS Test Machine INTERNET 1Gbps Optical Link CISCO 7513 SLA SLA Agent Agent -Packet -Packet Generator Generator PM PM Collector Collector Performance Analyzer Presenter L4 Switch Customer SLA DB Map DB Data Store DB IRL GES Gigabit Ethernet Backbone RSM RSM Parameter Mapper RSM RSM RSM RSM RSM SLA Agent - Packet Generator RSM 141.223.82.146 POS-SMS PIRL Test Machine
POS-SLMS NPM Connectivity Availability Ping Delivery One way packet loss RT Loss Availability DPNM Ping TCP Ping UDP TCPUDP 100KB 30 Availability DPNM (10 ) (10 ) (10 ) (10 ) 99.999% 0.1% 1ms RTT Latency Throughput Bandwidth :
POS-SLMS
QoS QoS SLA
ISP, SLA