OSPF/BGP Fast Convergence

 For OSPF:

a) Failure Detection: BFD

b) Failure Propogation : OSPF Timers (Throttle timers)

• OSPF “timers throttle lsa all <lsa-start> <lsa-hold> <lsa-max>” command

sub-second lsa-hold timer requires “timers lsa arrival n” tuning on all nodes within the area to tune “MinLSArrival”

c) SPF Calculation:

incremental SPF (iSPF) only calculates part of the SPT which is affected

OSPF Example: timers throttle spf 50 100 2000

d) RIB and FIB update: depends on scale and the trigger

e) Platform/Infrastructure: