Route Target Constrained Distribution of Routes with no Route Targets

Document Type Expired Internet-Draft (idr WG)
Authors Eric Rosen  , Keyur Patel  , Jeffrey Haas  , Robert Raszuk 
Last updated 2020-04-03 (latest revision 2019-10-01)
Replaces draft-rosen-idr-rtc-no-rt
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state Waiting for Implementation
Other - see Comment Log
Document shepherd John Scudder
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This Internet-Draft is no longer active.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


There are a variety of BGP-enabled services in which the originator of a BGP route may attach one or more "Route Targets" to the route. By means of a procedure known as "RT Constrained Distribution" (RTC), a given BGP speaker (call it "B") can announce the set of RTs in which it has interest. The implication is that if a particular route (call it "R") carries any RTs at all, BGP speaker B wants to receive route R if and only if B has announced interest in one of the RTs carried by R. However, if route R does not carry any RTs at all, prior specifications do not make it clear whether B's use of RTC implies that it does not want to receive route R. This has caused interoperability problems in the field, as some implementations of RTC do not allow B to receive R, but some services presuppose that B will receive R. This document updates RFC 4684 by clarifying the effect of the RTC mechanism on routes that do not have any RTs.


Eric Rosen (
Keyur Patel (
Jeffrey Haas (
Robert Raszuk (

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