Weight, like all BGP attributes, is present for EVERY route in the BGP
table.  So, if the route is sourced from another router, it will need to be
assigned a weight.  The assigned weight will be 0.  (Weight has
local-significance only, and is not transited)

So, routes sourced locally will have a local weight of 32k.  Routes sourced
remotely will have a weight of 0.  Using route-maps, you can adjust these
weights if needed.

As to why it's 32k, I assume it has something to do with the fact that the
BGP table is de-coupled from the routing table, and ensuring that routers
advertize themselves as the "best-path" as oposed to chosing another BGP
route as best.  However, this is off the top of my head, I'm sure Halabi or
Doyle would have more on this in their books.

--Wes




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