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draft-ietf-rtgwg-lfa-manageability-03

draft-ietf-rtgwg-lfa-manageability-03. S. Litkowski , Orange B. Decraene , Orange K. Raza , Cisco C. Filsfils, Cisco M. Horneffer , DT P. Sarkar, Juniper. Reminder. Goal : Addressing management aspects of Loop Free Alternates Policy based LFA selection :

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draft-ietf-rtgwg-lfa-manageability-03

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  1. draft-ietf-rtgwg-lfa-manageability-03 S. Litkowski, Orange B. Decraene, Orange K. Raza, Cisco C. Filsfils, Cisco M. Horneffer, DT P. Sarkar, Juniper

  2. Reminder • Goal : Addressing management aspects of Loop Free Alternates • Policy based LFA selection : • Applicable to both LFA & rLFA • Tie-breakers for selecting the LFA are not flexible enough to accommodate for all cases. • Calling for a policy based LFA selection, controlled by the SP according to local constraints • Based on multiple criterions with a default but customized relative order of preference. • Applied per protected interface or set of destinations. • Some operational aspects

  3. Diffsbetween -01 & -03 • Adding ECMP LFA case (loadsharingbetweenLFAs) : D D Pathlist P1 P2 Pathlist, primary if1 if2 M=10 L3 bundle L3 bundle Pathlist, backup FRR S if3 ECMP FRR path if4

  4. Diffsbetween -01 & -03 • Alternatepathattributesretrieval : • connectedalternate => no need of extra computation D S->N attributesretrievedfrom SPT(S) N->D attributesretrievedfrom SPT(N), alreadycomputedby LFA computation E N M=10 S

  5. Diffsbetween -01 & -03 • Alternatepathattributesretrieval : • remotealternate => extra computation required D S->PQ attributesretrievedfrom SPT(S) PQ->D attributesrequires SPT rooted at PQ N E PQ Number of PQ candidates maybevery high !!! A S

  6. Diffsbetween -01 & -03 • Alternatepathattributesretrieval : • remotealternate => prune somePQs ! Link RemoteRemote alternatealternatealternate ------------- ------------------ ------------- Alternates | LFA | | rLFA (PQs) | | Static | sources | | | | | tunnels | ------------- ------------------ ------------- | | | | | | | ---------------------- | | | Prune somePQs | | | | (sortingstrategy) | | | ---------------------- | | | | | | | ------------------------------------------------ | Collectalternateattributes | ------------------------------------------------ | | ------------------------- | Evaluatepolicy | ------------------------- | | Best alternates Seedraft-psarkar-rtgwg-rlfa-node-protection

  7. Diffsbetween -01 & -03 • Addedsome use cases : • whycoverage information isrequired • Fixing sometext in criteriondetailled info to fit WG comments

  8. Implementations • Threevendorknownimplementations: • Two successfully evaluated in Service Provider lab

  9. Nextsteps ? • Wetookintoaccount all WG comments • Document is stable • Is thereanyother point to takeintoaccount ? • Is theresomeblocking points ? • WGLC ?

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