In the draft:
> Installation of the new route is delayed by time DELAY_TYPEC.
> Until then, the router continues to use its old next-hops.
>DELAY_TYPEB and DELAY_TYPEC are two configurable constants. They
>should be configured with the same value on all routers in the net-
>work and such that following equation is true:
>DELAY_TYPEB > DELAY_TYPEC > fault-propagation-time
>where fault-propagation-time is the time it is expected to take
>routers in the network to propagate new link-state information, cal-
>culate the new SPT, check the safety condition of the neighbors, and
>install required FIB entries.
>Suggested default values for DELAY_TYPEB and DELAY_TYPEC are 4 and 2
- I'm O.K. with DELAY_TYPEB timers at this length.
- But I think DELAY_TYPEC > time for an immediate neighbor to install an
This value is probably not very long (in the order of 100msec). In my
understanding Delay_TYPEC starts ticking very close to the time that updates
are being sent from C to B (In the Figure 1 the immediate neighbor). Once
B has its alternates in place, C can forward to B with no issues.
So I suggest:
DELAY_TYPEB > fault-propagation-time
DELAY_TYPEC > time for an immediate neighbor to install an alternate. I
suppose one could then ask: Could I live with no timer on C?
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