Persistent Route Oscillation in BGP Constrained Route Distribution

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Last updated 2017-09-14 (latest revision 2017-03-13)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


RFC4684 defines Multi-Protocol BGP (MP-BGP) procedures that allow BGP speakers to exchange Route Target reachability information (RT- Constrain) to restrict the propagation of Virtual Private Network (VPN) routes. In network scenarios where hierarchical route reflection (RR) is used, the existing RT-Constrain mechanism may result in persistent route oscillations within RRs. This document describes the problem and proposes a solution.


Dongling Duan (
Jakob Heitz (
Keyur Patel (
Jeffrey Haas (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)