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NOBEL WP2 Meeting. Alcatel CIT D27 TE planned activities Madrid, 11-13.04.05. D27 TE planned contributions. Multicriteria Routing Algorithms: end-to-end simulation results of proposals described in D17

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nobel wp2 meeting

NOBEL WP2 Meeting

Alcatel CIT

D27 TE planned activities

Madrid, 11-13.04.05

d27 te planned contributions
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
d27 te multi criteria routing 1 2004 achievements and plans for 2005
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
d27 te multi criteria routing 2 plans for 2005 cont
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)
d27 te multi criteria routing 3 plans for 2005 cont
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
d27 te multi criteria routing 4 issues and questions
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: [email protected]

d27 te virtual topology design 1
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
d27 te virtual topology design 2
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

d27 traffic modelling
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

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