BGP Multi-homing Part 6: iBGP RR + Shadow Session + ECMP

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This video introduces a "shadow session", which is an additional iBGP session from core/edge routers to a route-reflector for the purpose of learning a diverse path. This is an excellent study resource for #CCNP Enterprise, #CCIE Enterprise Infrastructure (EI) and Service Provider (SP), and #CCDE.

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If We lost the primary session, will the secondary sessions advertise the best path or it is allowed to advertise only the diverse path?

nanisyako