Route Filtering

Concept/Framework Core NetworkTransport ResilienceSecurityService Assurance Telecommunications
Definition

Route filtering is the policy process of allowing or blocking specific routes based on attributes such as prefix, source, neighbor, or policy rules.

Key Points
  • Prevents undesired prefixes from entering or leaving a routing domain.
  • Used to reduce leakage, enforce policy, and limit route propagation.
  • Appears in BGP and interior routing designs.
  • Supports cleaner boundaries between routing domains and administrative zones.
Concept

It is a control mechanism for route visibility and propagation, not a route creation mechanism.

Explainer

Route filtering is commonly applied at routing boundaries to control what is learned and what is advertised. It is distinct from route summarization and route redistribution.

Cite this entry

Route Filtering. ConnectedEarth Knowledge Base. https://connectedearth.space/knowledge-base/route-filtering/ (updated 13 September 2026).