NOBEL WP2 Meeting

1. NOBEL WP2 Meeting Alcatel CIT D27 TE planned activities Madrid, 11-13.04.05

2. D27 TE planned contributions • Multicriteria Routing Algorithms: end-to-end simulation results of proposals described in D17 • Virtual Topology optimisation (IP/MPLS over Transport): include protection in virtual topology design and optimisation of cost function in case of IP/MPLS over SONET/SDH • Traffic Modelling: traces analysis (from UST-IKR) and confrontation with flow model

3. D27 TE: Multi-criteria routing (1)2004 achievements and plans for 2005 • In 2004: Proposal of an RMC Algorithm (Routing with Multiple Criteria): • fast, network state-sensitive • Multi-criteria: transit delay, bandwidth, hop count, administrative cost • Multi-constrained: on above metrics + on the link CoS • Adaptive: choice of criteria customized to operator’s policy and current network management priorities • Planned in 2005 : • Load Balancing based on RMC output : use of the multiple routes per destinations that are output by RMC. • Goal: Without additional network capacity, • Increase network capacity and availability (operator friendly) • Increase goodput and fairness (user friendly) • Minimize packet loss and traffic oscillations

4. D27 TE: Multi-criteria routing (2)plans for 2005 (cont.) • RMC Algorithm designed and tested for distributed IP • Prevention of traffic oscillation and deviation • LS DB synchronization mechanisms • … but adaptable to MPLS • No traffic deviation issues • LS DB synchronization is simpler • Core network & end2end level performance assessment • Optimal traffic measurement and information flooding (planned) • Control mechanisms and fine-tuning: • LS Database Synchronization (specified) • Triggering mechanisms (on-alarms, on-demand) (tests ongoing) • Sensitivity analysis : (to load threshold) (simulation ongoing) • Progressive flow shifting: (specified) • flow shifting granularity, pace and duration (simulation ongoing)

5. D27 TE: Multi-criteria routing (3)plans for 2005 (cont.) • Network & end2end level performance assessment: ongoing RMC implemented on an end2end TCP flows simulator: existing topology, 20 core nodes, different link capacities • Up to 900 000 flows on up to 300 000 DSL terminal nodes simulated • Network-level evaluation: Link utilization, Congestion analysis, Optimization/Sensitivity. • User-level evaluation: Goodputperapplication or per terminal type, Fluctuations of throughput of each application, delays, loss rate etc • First simulation results on distributed IP with synchronized LS DB: overall link load increase • Meet the above mentionned goals

6. D27 TE: Multi-criteria routing (4)issues and questions • DDTE (Distributed Dynamic Traffic Engineering) and resiliency • Contribution of load-sensitive mono or multi-path routing : what performances are expected ? • Which metrics for QoR? Bounds on each metric? • Priorities over multiple contraints: Restoration Time, Satisfaction rate of demands, … • E.g. Protection with Time < 50ms, but for what Blocking probability for connections? • Need for input data • Examples of core networks with different link capacities • Traffic data (ongoing in NOBEL) in « normal case » • Traffic data with cases of local and global load increase • Scenarii of link and router failures Contact: sabine.randriamasy@alcatel.fr

7. D27 TE: Virtual topology design (1) • 2004 (D17): Packet over Circuit e.g. IP/MPLS o OTH (SDH, OTN) • Virtual topology design: • method used to provide intermediate results to FT for their study case “Impact of optical layer pass-through in core networks” in D15 • The tool actually provides dimensioning results • 2005 (D27): Evolutions • Simplified support of statistical multiplexing • Today, the tool use a flow based modelisation to estimate traffic aggregation in the path computation to create the virtual topology • Imposes to have detailed traffic matrices where individual flows per type of applications are described • On the contrary, most Reference networks use simpler traffic matrices (Mean traffic, Peak traffic, or even directly SONET/SDH traffic matrix) • A simplified modeling of stat mux compatible with actual traffic matrices format is interesting for coarser analysis

8. D27 TE: Virtual topology design (2) • 2005 (D27): Evolutions (con’t) • Refinements of cost and inter-working models • Virtual Topology creation relies today only on a simple cost ratio between a Router port and a XC port • Need a finer granularity for the cost ratio depending on functionality required (or not) on each type of line cards • Support of Protection and restoration • Today virtual topology without protection • Improve with 1+1 and shared mesh in transport, FRR at IP level • Possible introduction of third layer (WDM bypass) Contacts: {martin.vigoureux or nicolas.le_sauze} @alcatel.fr

9. D27 Traffic modelling: • Note: not a big activity (1MM in 2005)! • The main goal is to analyse a real trace and compare mesaured aggregated flow characteristics with the flow (/Guerin) bufferless model • Analysis of traces from UST-IKR • Link 100 Mbit/s, close to access, but already quite high bit-rate and aggregated between all the students • Example at peak hour: Sunday 31/10/2004, around 19:00 [average ~ 34 Mbit/s] • Goal: • Analyse time characteristics: evolution of the Coefficient of Variation of the aggregated flow at different time scales relevant with delays encountered in transport networks • Could CoV (t) be approximated by CoV(0) as done in a bufferless model? • Should be able to present some results at next meeting Contact: {ludovic.noirie or nicolas.le_sauze} @alcatel.fr