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Routing & Switching · Advanced

Extended Community

A 64-bit BGP community with type and value fields, used for route targets, site of origin, EVPN and other functions.

Definition

Extended communities (RFC 4360) carry structured data such as route-target (RT), site-of-origin (SoO), OSPF domain ID and EVPN MAC mobility. They are essential to MPLS L3VPN and EVPN control planes.

Example

route-target export 65000:10 generates an extended community.

Exam tip

Route targets are extended communities; route distinguishers are not attributes at all.

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