Root cause notification to solve BGP path hunting

Document Type Expired Internet-Draft (individual)
Authors Keyur Patel  , Chandra Appanna  , Prodosh Mohapatra  , John Scudder  , Jim Uttaro 
Last updated 2010-08-08
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Whenever a prefix is withdrawn using BGP withdrawal mechanism, it triggers a number of updates in certain scenarios before the prefix is completly withdrawn from the entire BGP network. This phenomenon is popularly known as _path exploration_ or _path hunting_ and occurs because of path vector property of BGP. It results in a series of unwanted or redundant transitions that overloads the BGP network. This document describes a mechanism to help limit the amount of such path exploration by defining two optional transitive path attributes for BGP: SPEAKERID_PATH and ROOT_CAUSE.


Keyur Patel (
Chandra Appanna (
Prodosh Mohapatra (
John Scudder (
Jim Uttaro (

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