TopicIT Networking →
BGP Community is a tag attached to BGP routes to carry routing policy intent.
Simple definition
BGP Community is a tag attached to BGP routes to carry routing policy intent. It belongs to the Networking vocabulary.
What is it used for?
Its main purpose is to classify routes and apply advertisement, preference, or filtering policies.
How does it work?
routers attach community values to prefixes and consume them in route maps or policies.
Key points
- Scope: A tag attached to BGP routes to carry routing policy intent.
- Operational goal: Classify routes and apply advertisement, preference, or filtering policies.
- Mechanism: routers attach community values to prefixes and consume them in route maps or policies.
Points to watch
Community conventions should be documented and consistent across devices.
In short
BGP Community is a Networking concept to know when you need to classify routes and apply advertisement, preference, or filtering policies.