InBGP (Border Gateway Protocol), when evaluating multiple routes to the same destination, the first attribute that is considered is thelocal preferencevalue. Thelocal preferenceis a BGP attribute used to influence outbound routing decisions within an Autonomous System (AS).
Step-by-Step Breakdown:
* Local Preference:Thelocal preferenceattribute is used to determine which path is preferred for traffic leaving the AS. The higher the local preference value, the more preferred the route.
* BGP Path Selection:The BGP path selection process evaluates the following attributes in this order:
* Local Preference(higher is preferred)
* AS Path(shorter is preferred)
* Origin(IGP > EGP > incomplete)
* MED (Multi-Exit Discriminator)(lower is preferred)
Juniper Reference:
* BGP Path Selection: In Junos, thelocal preferenceattribute is the first to be evaluated when determining the best path for outbound traffic.