BGP Local Preference is an internal BGP preference attribute used to favor an exit path inside an autonomous system.
Simple definition
BGP Local Preference is an internal BGP preference attribute used to favor an exit path inside an autonomous system. It belongs to the Réseau vocabulary.
What is it used for?
Its main purpose is to influence BGP best-path selection without advertising that preference to eBGP neighbors.
How does it work?
the value is compared during best-path selection and a higher value is generally preferred.
Key points
- Scope: An internal BGP preference attribute used to favor an exit path inside an autonomous system.
- Operational goal: Influence BGP best-path selection without advertising that preference to eBGP neighbors.
- Mechanism: the value is compared during best-path selection and a higher value is generally preferred.
Points to watch
Inconsistent policy can create asymmetric or unexpected paths.
In short
BGP Local Preference is a Réseau concept to know when you need to influence BGP best-path selection without advertising that preference to eBGP neighbors.