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AR185 - pc_evans - 03-04-2024
Keywords here are 'only ever uses the MPLS B Network'. Any option that sets a preferences is invalid.
Modifying the weight, local preference or AS Path prepending allows traffic to go through MPLS A during an outage.
AS Path filtering is the only option. It allows connectivity to Branch A, but would prevent Branch b from learning routes from MPLS A.