County courts need all routers in the civic ASN to exit via the ISP…

Question

County courts need all routers in the civic ASN to exit via the ISP that offers the better SLA, without using MED toward customers. Which BGP attribute should they set for outbound preference inside the AS?

Accepted Answer

LOCALPREF, which influences path selection for outbound traffic consistently across iBGP speakers — LOCALPREF is the sticky note passed around the whole ASN saying ‘prefer this ISP exit.’ Set it high on the better-SLA path and every iBGP speaker gets the memo. Weight is a sticky note that never leaves one router’s desk.

Answer

MED, because it is always compared before LOCALPREF and is mandatory between confederations

Answer

Origin code Incomplete on every ISP prefix to force hot-potato routing

Answer

Cisco Weight on a single border router so every other router inherits the same exit

County courts need all routers in the civic ASN to exit via the ISP that offers the better SLA, without using MED toward customers. Which BGP attribute should they set for outbound preference inside the AS?

Short Explanation

Full Explanation