cinkler@bute a21: resilience strategies in mmm networks qor: quality of resilience by tibor cinkler...

cinkler@BUTE

A21: Resilience Strategies in MMM Networks QoR: Quality of Resilience

By Tibor Cinkler

[email protected]

NOBEL WP2 May 18 Berlin 2cinkler@BUTE

Three Topics:

• Activities and Workplane WP2 A21: 15 min, May 18 14:00

“Resilience Strategies in 3M Networks”

• Technical presentations May 18 16:00

“On Quality of Resilience (QoR)”


“Brief explanation of BUTE SW tool for inter-domain and intra-domain routing”


1. “Resilience Strategies in MMM Networks”: Activities and work-plan of WP2 A21

Protection/restoration in multi-layer/domain/service networks

M5: Glossary for Resilience

M6: QoR: Quality of Resilience– Definition of required levels of Resilience / Reliability / Protection / Restoration

– Classification of Services According their QoR requirements

M7: Reference network for 3M resilienceNoE e-Photon/ONe (and IP NOBEL) European Reference Network

Topology, resources, traffic


1. “Resilience Strategies in 3M Networks”: Activities and work-plan of WP2 A21

M8: Overview of Resilience Mechanisms in MultiLayer networks

- How GMPLS/ASTN supports resilience? (Ctrl and Mngmnt)

- Proposals for potential extension of the Ctrl plane to better support resilience

- Resilience at different layers (Study IST LIONs documents) including IP, Ethernet, ...

- Interoperation and interactions between layers

- Traffic Grooming for more efficient resilience

- End-to-end (path), link, span, segment, p-cycle, RPR

- within and between domains (Overview of PNNI, BGP-4, etc.)

- protection, restoration, MPLS Fast Rerouting



M11:

Overview of Resilience Mechanisms in Multi-LAYER Multi-DOMAIN

Networks

M11:

Overview and Evaluation of Routing Mechanisms in Multi-LAYER

Multi-DOMAIN Networks static or dynamic (on-line, real-time)

D17



M18: Evaluation of Various Resilience Strategies in Multi-LAYER Networks

Evaluation Criteria:– How complex the calculation is? (OPEX)– Amount of resources (capacity) required (CAPEX)– Speed of reaction (<50ms?)– Availability improvement (Protects Against Single or Multiple Simultaneous

Failures)

Availability Studies

M20: Evaluation of Various Resilience Strategies in Multi-DOMAIN Networks

Same Evaluation Criteria

M22: Finalising the Deliverable D27 on Resilience (and TE) in MMM networks.


Contribution to Deliverables

• D12, D15, D17, D27, D31

• D17: Preliminary report on new methods for route management (intra- and inter-domain), and accurate statistical models for evaluating the impact on QoS (March 2005) [led by P15: T-Systems]

– D17 will describe new methods for route management (intra- and inter-domain), so that the QoS performance figures are taken into account in the routing decisions. On the other hand, accurate statistical models based on user’s traffic characterization and modelling will be defined in order to be used in traffic engineering and resilience studies

• D27: Final report on traffic engineering & resilience strategies for NOBEL solutions (October 2005) [led by P22: IMEC]

– D27 will describe efficient QoS assurance and resilience solutions to optimise network resources based on the statistical models previously described in D17. Survivability studies will investigate resilience strategies in multi-layer/domain/service networks (such as optical restoration/protection, MPLS Fast Reroute, etc.) and their interworking. On the other hand traffic/network engineering studies will be focused on solutions to optimise utilisation of network resources, QoS assurance and congestions avoidance.


Reference Network1. With Graph Maker

• Freely available with source


2. yEd: more features, but no sourceextended GraphML


E-Tools needed: 1. repository & VC

• Repository instead of attachments v/vo Version control– BSCW http://bscw.gmd.de/

– http://ausweb.scu.edu.au/aw03/papers/cassidy/paper.html

– Microsoft Exchange, Windows 2003

– WIKI, TWIKI http://twiki.org/cgi-bin/view/TWiki/WebHome

– WinCVS www.wincvs.org, cvs www.cvshome.org

– Code Versioning System web repository http://cvs.dyne.org/viewcvs.cgi/

– IBM Informics

– Savannah: http://bebas.vlsm.org/v01/software/SourceForge/savannah.html

– Total Commander with an scp plug-in


E-Tools needed 2.VoIP

Windows Messanger (Built in into Windows XP)• Net Meeting -> Office Live Meeting www.placeware.com penzert

Yahoo Messanger 5.6 http://messenger.yahoo.com/ conference Call with WebCam (for: Windows Mac Linux)

• Private Chat Room can be easily created! A lot of advertyisment...• Yahoo! Business Messenger 2.0 (with WEB conferencing) for money

PicoPhone 1.63 http://www.vitez.it/picophone/index.html

Speak Freely 7.6a http://speak-freely.sourceforge.net/ (for: Windows Mac Linux)

Skype 0.97.0.6 http://www.skype.com/ • For conference Call!!! Up to 5 parties only :( • P2P, Windows only (XP or 2000), Typically goes trough Firewalls, No video available!

ICQ 2003b http://web.icq.com/ (http://www.icq.com/icqtour/)• PC to PC (ICQ Phone), Video Chat, SMS kuldesre is van lehetoseg, Phone to PC call (this

is a novelty!)


Second Topic:

• Activities and workplane WP2 A21: 15 min, May 18 14:00







2. Partners Interested in QoR

1. TIlab, It, [email protected],

2. Marconi, De, [email protected]

3. AGH, Pl: Krzysztof [email protected]

4. BUTE, Hu: Tibor [email protected], Janos [email protected]

5. Siemens, De: [email protected]

6. FT, Fr: [email protected]

7. Alcatel, Fr: [email protected]

8. T-Systems, De: [email protected]

9. UPC, Es: Salvatore [email protected]

10. Telenor, No: [email protected]

11. IMEC, Be: [email protected]

(All A21 partners except Ericsson and Lucent)


2. QoR: Quality of Resilience

Based on:

• R. Clemente, L. Serra, G.D’Orazio G. Cosmo: “A Framework for Class of Service Definition in GMPLS-based Meshed ASTN”, DRCN 2003

• M. Barry, S. Bodamer, J. Späth, M. Jäger, R. Hülsermann: “A Classification Model for Network Survivability Mechanisms”, ITG 2004

• J.F. Lobo, M.L.G. Osma, Eds.: Internal Report Work Package 2: “Common understanding of key aspects inside WP2” (Glossary)

• D. Colle, Ed.: NOBEL Dictionary: Resilience related terminology

• D. Colle, I. Lievens, M. Pickavet: IMEC Contribution to A2.1 – Overview on Resilience Mechanisms


CoS and QoR

• QoS: Class of Service• QoR is part of QoS• Tradeoff between availability and amount of required resources

(OPEX&CAPEX)– For a new connection:

• No resilience at all• Protection against a single failure• Restoration

• Multiple Layers and Multiple Domains• Availability level for a connection

– Against multiple failures: 0, 1, 2, 3

– Shorter out-of-service: < 50ms < nx100ms < nxSecond < nxHours


Number of failures at a time

• Number of failures:– A single link fails [1L]– A single node fails [1N]– Two links (very much influenced by which two?!) [2L]

• If two links adjacent to a single node then it is covered by the upper (1N) case

– A link and a node (not adjacent!) [L+N]• If adjacent then covered by 1N

– Three links [3L]• If adjacent, then covered by either 1N or L+N

– For Multi-Domain case:• Are failures in different domains?• Are Inter-Domain Links affected?

– Multi-Layer case


Out-of-Service

• Out-of-Service Time:– Detection

– Localisation

– Routing

– Allocation

– Assignment

– Switching

– Reverting !!!

• Faster recovery (shorter out-of-service): < 50ms (protection) [P]

< nx100ms (fast (pre-planned) restoration) [FR]

< nxSecond (restoration) [R]

< nxHours (repair)


Trade-offs

• Trade-off: number of failures, requested resources and speed:– P+P+P or P+FR + R or P+Repair

• Protecting: Paths -> Subnetworks (domains) -> Segments –> Links-> Easier and faster to recover after multiple failures!!!

-> More resources needed

A part of working paths protected onlyRCR: Restorable Connection-Count Ratio

For aggregated (lower layer traffic streams)

RBR: Restorable Bandwidth RatioFor Best Effort elastic traffic


Fairness?

• How can we guarantee availability if we give Resilience Priority (RP) to certain connections of an aggregated stream? What if all are “platinum”?

• Is it allowed to take the protection resources of a single-failure-protected connection if needed by a higher RP connection?

• What about the working resources of an unprotected path, that was not affected by failure?


Other Open Questions

• What is the availability of a protection path? (OoS: Out of Service)• What is the blocking probability of a protection path?• Can a protection path be established after a certain waiting time?• Should the Availability (e.g., 99.999%) counted for one year or

some other period?• Global and local (e.g., Within a routing domain) reconfiguration

performed by the MP?


Third Topic:

• Activities and workplane WP2 A21: 15 min, May 18 14:00






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