draft-ietf-idr-bgp-bestpath-selection-criteria-02.txt   draft-ietf-idr-bgp-bestpath-selection-criteria-03.txt 
IDR Working Group Rajiv Asati IDR Working Group Rajiv Asati
Internet Draft Cisco Systems Internet Draft Cisco Systems
Intended status: Informational Intended status: Informational
Expires: Nov 2011 Expires: Nov 2011
May 5, 2011 July 26, 2011
BGP Bestpath Selection Criteria BGP Bestpath Selection Criteria
draft-ietf-idr-bgp-bestpath-selection-criteria-02.txt draft-ietf-idr-bgp-bestpath-selection-criteria-03.txt
Abstract Abstract
BGP specification [RFC4271] prescribes 'BGP next-hop reachability' BGP specification [RFC4271] prescribes 'BGP next-hop reachability'
as one of the key 'Route Resolvability Condition' that must be as one of the key 'Route Resolvability Condition' that must be
satisfied before the BGP bestpath candidate selection. This satisfied before the BGP bestpath candidate selection. This
condition, however, may not be sufficient (as explained in the condition, however, may not be sufficient (as explained in the
Appendix section) and desire further granularity. Appendix section) and desire further granularity.
This document defines enhances the "Route Resolvability Condition" This document defines enhances the "Route Resolvability Condition"
to facilitate the next-hop to be resolved in the chosen data plane. to facilitate the next-hop to be resolved in the chosen data plane.
Status of this Memo Status of this Memo
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Copyright Notice Copyright Notice
Copyright (c) 2011 IETF Trust and the persons identified as the Copyright (c) 2011 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
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Table of Contents Table of Contents
1. Introduction...................................................2 1. Introduction...................................................2
2. Specification Language.........................................3 2. Specification Language.........................................3
3. Route Resolvability Condition - Modification...................3 3. Route Resolvability Condition - Modification...................3
4. Conclusions....................................................4 4. Conclusions....................................................4
5. Security Considerations........................................5 5. Security Considerations........................................4
6. IANA Considerations............................................5 6. IANA Considerations............................................4
7. Acknowledgments................................................5 7. Acknowledgments................................................5
8. Appendix.......................................................5 8. Appendix.......................................................5
9. References.....................................................8 9. References.....................................................8
Author's Addresses................................................9 Author's Addresses................................................9
1. Introduction 1. Introduction
As per BGP specification [RFC4271], when a router receives a BGP As per BGP specification [RFC4271], when a router receives a BGP
path, BGP must qualify it as the valid candidate prior to the BGP path, BGP must qualify it as the valid candidate prior to the BGP
bestpath selection using the 'Route Resolvability Condition' bestpath selection using the 'Route Resolvability Condition'
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