Hi Les, > \Well no. If some nodes in the network do NOT use LSPs they receive for > several seconds while other nodes use them immediately this will certainly > negatively impact convergence. That has been clearly demonstrated in real > networks in the past. > I don’t see how you can safely enable what you propose unless all nodes in > the area support it.
I’m not following this line of reasoning. Today, thanks to the vagaries of flooding, different segments arrive at different times. There’s not a lot that the transmitter can do to ensure that the intermediate nodes do The Right Thing, whatever that may be. Different implementations will SPF at different times, creating inconsistent results. In other words, things are not safe today. The whole point of this exercise is to try to help everyone align on convergence. What we’d really like is for everything to flood and then somehow magically everyone SPFs at the exact same time. Unfortunately, this only happens at Hogwarts. The proposal on the table is to convey some amount of temporal dependency so that receivers can make a slightly more intelligent decision about when to SPF. I’m not seeing how more information makes the situation worse. Cheers, Tony
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