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The timers in link state protocols are there to prevent a control plane meltdown due to rapidly changing state. Generally speaking, you want to configure these times so the reaction to the first change is almost immediate—assuming the first change is normally a singular event in the state of the network. If multiple events normally happen close together in time, you’re better off to set these timers to react more slowly, so more information can be gathered before the first reaction; the more information SPF has when running, and the more closely all the router’s databases across the network match before SPF is run, the less likely routing loops will form for any length of time. Generally speaking, to set these timers...


Cover of The Art of Network Architecture: Business-Driven Design


SPF timers for OSPF and ISIS considerations