Extensions to RT-Constrain in Hierarchical Route Reflection Scenarios

Document Type Expired Internet-Draft (idr WG)
Authors Jie Dong  , Mach Chen  , Robert Raszuk 
Last updated 2018-01-04 (latest revision 2017-07-03)
Replaces draft-dong-idr-rtc-hierarchical-rr
Stream IETF
Intended RFC status (None)
Expired & archived
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Stream WG state WG Document
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IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The Route Target (RT) Constrain mechanism specified in RFC 4684 is used to build a route distribution graph in order 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 cannot guarantee a correct route distribution graph. This document describes the problem scenario and proposes a solution to address the RT-Constrain issue in hierarchical RR scenarios.


Jie Dong (jie.dong@huawei.com)
Mach Chen (mach.chen@huawei.com)
Robert Raszuk (robert@raszuk.net)

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