As per CCO:
BGP selects only one path as the best path. When the path is selected, BGP
puts the selected path in its routing table and propagates the path to its
neighbors.
But...
Step 3 - prefer the path with the largest local preference.
Step 4 - If the local preferences are the same, prefer the path that was
originated by BGP running on this router.

So if RtrA originated 10.0.0.0, it advertises this to its IBGP peer RtrB with
a default Local Preference = 100, now if RtrB is configured with a route-map
that
sets this incoming update's Local Preference to 250, this would result in
RtrA
installing in its route table "to get to 10.0.0.0 prefer taking the path that
goes to RtrB"? So now RtrA propagates this info to RtrB?
Please help make some sense of this.




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