draft-ietf-idr-bgp-dpa-01.txt   draft-ietf-idr-bgp-dpa-02.txt 
INTERNET-DRAFT Enke Chen INTERNET-DRAFT Enke Chen
<draft-ietf-idr-bgp-dpa-01.txt> Tony Bates <draft-ietf-idr-bgp-dpa-02.txt> Tony Bates
Expires in six months MCI MCI
June 1995 July 1995
Destination Preference Attribute for BGP Destination Preference Attribute for BGP
<draft-ietf-idr-bgp-dpa-01.txt> <draft-ietf-idr-bgp-dpa-02.txt>
Status of this Memo Status of this Memo
This document is an Internet Draft. Internet Drafts are working This document is an Internet Draft. Internet Drafts are working
documents of the Internet Engineering Task Force (IETF), its Areas, documents of the Internet Engineering Task Force (IETF), its Areas,
and its Working Groups. Note that other groups may also distribute and its Working Groups. Note that other groups may also distribute
working documents as Internet Drafts. working documents as Internet Drafts.
Internet Drafts are draft documents valid for a maximum of six Internet Drafts are draft documents valid for a maximum of six
months. Internet Drafts may be updated, replaced, or obsoleted by months. Internet Drafts may be updated, replaced, or obsoleted by
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multi-provider Internet. multi-provider Internet.
Destination Preference Attribute (DPA) Destination Preference Attribute (DPA)
This document proposes the DPA path attribute, which is an optional This document proposes the DPA path attribute, which is an optional
transitive attribute of fixed length. The attribute is represented transitive attribute of fixed length. The attribute is represented
by a pair <AS#, DPA value>. The AS# is a two octet non-negative by a pair <AS#, DPA value>. The AS# is a two octet non-negative
integer, which denotes the AS that specifies the preference. The DPA integer, which denotes the AS that specifies the preference. The DPA
value is a four octet non-negative integer. value is a four octet non-negative integer.
The DPA attribute has Type Code 10. Code 10 is chosen so as not to The DPA attribute has Type Code 11.
conflict with existing and other proposed codes.
Route Selection Process Route Selection Process
The DPA attributes are considered comparable only if the DPA The DPA attributes are considered comparable only if the DPA
attributes are present in all the routes being compared and are set attributes are present in all the routes being compared and are set
by the same AS. by the same AS.
The comparable DPA attributes shall be used as a selection criteria, The comparable DPA attributes shall be used as a selection criteria,
after the "local_pref" attribute is evaluated, and before the after the "local_pref" attribute is evaluated, and before the
evaluation of the AS path length and the multi-exit-discriminator evaluation of the AS path length and the multi-exit-discriminator
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insightful comments and suggestions. insightful comments and suggestions.
References References
[1] Rekhter, Y., and Li, T., "A Border Gateway Protocol 4 (BGP-4)", [1] Rekhter, Y., and Li, T., "A Border Gateway Protocol 4 (BGP-4)",
RFC1771, March 1995. RFC1771, March 1995.
[2] Y. Rekhter, and P. Gross, "Application of the Border Gateway [2] Y. Rekhter, and P. Gross, "Application of the Border Gateway
Protocol in the Internet", RFC1772, March 1995. Protocol in the Internet", RFC1772, March 1995.
[3] Chen, E., and Bates, T., "Analysis and Critique of the Current [3] Chen, E., and Bates, T., "Current Practice of Implementing
Practice of Implementing Symmetric Routing in the Multi-Provider Symmetric Routing and Load Sharing in the Multi-Provider Internet",
Internet", INTERNET-DRAFT, <draft-ietf-idr-symm-multi-prov-01.txt>, INTERNET-DRAFT, <draft-ietf-idr-symm-multi-prov-01.txt>, June 1995.
June 1995.
[4] Chen, E., and Bates, T., "Application of the BGP Destination [4] Chen, E., and Bates, T., "Application of the BGP Destination
Preference Attribute in Implementing Symmetric Routing", INTERNET- Preference Attribute in Implementing Symmetric Routing", INTERNET-
DRAFT, <draft-ietf-idr-dpa-application-01.txt>, June 1995. DRAFT, <draft-ietf-idr-dpa-application-01.txt>, June 1995.
[5] Antonov, V., "BGP AS Path Metrics", INTERNET DRAFT, <draft-ietf- [5] Antonov, V., "BGP AS Path Metrics", INTERNET DRAFT, <draft-ietf-
idr-bgp-metrics-00.txt>, March 1995. idr-bgp-metrics-00.txt>, March 1995.
[6] Rekhter, Y., "Routing in a Multi-provider Internet", RFC1787, [6] Rekhter, Y., "Routing in a Multi-provider Internet", RFC1787,
April 1995. April 1995.
 End of changes. 

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