draft-ietf-idr-as4bytes-02.txt   draft-ietf-idr-as4bytes-03.txt 
Network Working Group Quaizar Vohra Network Working Group Quaizar Vohra
Internet Draft Juniper Networks Internet Draft Juniper Networks
Expiration Date: October 2001 Enke Chen Expiration Date: November 2001 Enke Chen
Network Working Group Redback Networks, Inc. Network Working Group Redback Networks, Inc.
BGP support for four-octet AS number space BGP support for four-octet AS number space
draft-ietf-idr-as4bytes-02.txt draft-ietf-idr-as4bytes-03.txt
1. Status of this Memo 1. Status of this Memo
This document is an Internet-Draft and is in full conformance with This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026. all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
skipping to change at page 3, line 33 skipping to change at page 3, line 33
A BGP speaker that supports 4-octets Autonomous System numbers may A BGP speaker that supports 4-octets Autonomous System numbers may
advertise this to its peers using the BGP Capability Advertisements. advertise this to its peers using the BGP Capability Advertisements.
A BGP speaker that advertises such capability to a particular peer, A BGP speaker that advertises such capability to a particular peer,
and receives from that peer the advertisement of such capability MUST and receives from that peer the advertisement of such capability MUST
encode Autonomous System numbers as 4-octets entities in both the encode Autonomous System numbers as 4-octets entities in both the
AS_PATH and the AGGREGATOR attributes in the updates it sends to the AS_PATH and the AGGREGATOR attributes in the updates it sends to the
peer, and MUST assume that these attributes in the updates received peer, and MUST assume that these attributes in the updates received
from the peer encode Autonomous System numbers as 4-octets entities. from the peer encode Autonomous System numbers as 4-octets entities.
The new attributes, NEW_AS_PATH and NEW_AGGREGATOR should not be The new attributes, NEW_AS_PATH and NEW_AGGREGATOR should not be
carried in the updates between NEW BGP peers. A NEW BGP speaker that carried in the UPDATE messages between NEW BGP peers. A NEW BGP
receives an UPDATE message from a NEW BGP speaker, with the speaker that receives the NEW_AS_PATH and NEW_AGGREGATOR path
NEW_AS_PATH attribute carried in the UPDATE message must ignore the attributes in an UPDATE message from a NEW BGP speaker should discard
attribute. The same applies to the NEW_AGGREGATOR attribute. these path attributes and continue processing the UPDATE message.
4.2. Interaction between NEW and OLD BGP speaker 4.2. Interaction between NEW and OLD BGP speaker
4.2.1. BGP Peering 4.2.1. BGP Peering
Note that peering between a NEW BGP speaker and an OLD one is Note that peering between a NEW BGP speaker and an OLD one is
possible only if the NEW BGP speaker has a 2-octets AS number. possible only if the NEW BGP speaker has a 2-octets AS number.
However, this document doesn't assume that an Autonomous System with However, this document doesn't assume that an Autonomous System with
NEW speakers has to have a globally unique 2-octets AS number - NEW speakers has to have a globally unique 2-octets AS number -
AS_TRANS could be used instead (even if multiple Autonomous System AS_TRANS could be used instead (even if multiple Autonomous System
skipping to change at page 6, line 45 skipping to change at page 6, line 45
In addition, this document introduces two new BGP optional transitive In addition, this document introduces two new BGP optional transitive
attributes. The first is the NEW_AS_PATH attribute, which preserves attributes. The first is the NEW_AS_PATH attribute, which preserves
the AS path information with 4-octet AS numbers across old BGP the AS path information with 4-octet AS numbers across old BGP
speakers. The second is the NEW_AGGREGATOR attribute, which is speakers. The second is the NEW_AGGREGATOR attribute, which is
similar in use to the current AGGREGATOR attribute but it carries similar in use to the current AGGREGATOR attribute but it carries
4-octet AS numbers. The Type Codes for these attributes are to be 4-octet AS numbers. The Type Codes for these attributes are to be
assigned by IANA. assigned by IANA.
Finally, this document introduces a reserved 2-octets AS number - Finally, this document introduces a reserved 2-octets AS number -
AS_TRANS. The AS number for AS_TRANS are to be assigned by the IANA. AS_TRANS. The AS number for AS_TRANS is to be assigned by the IANA.
8. Security Considerations 8. Security Considerations
Security issues are not discussed in this document. Security issues are not discussed in this document.
9. Acknowledgments 9. Acknowledgments
The authors would like to thank Yakov Rekhter and Chaitanya The authors would like to thank Yakov Rekhter, Chaitanya Kodeboyina,
Kodeboyina for the numerous discussions which went into the making of and Jeffrey Haas for the numerous discussions which went into the
this draft. making of this draft.
10. References 10. References
[BGP] Rekhter, Y., Li, T., "Border Gateway Protocol 4", draft-ietf- [BGP] Rekhter, Y., Li, T., "Border Gateway Protocol 4", draft-ietf-
idr-bgp4-12.txt idr-bgp4-12.txt
[EXT-COM] Ramachandra, S., Tappan, D., and Rekter Y. "BGP Extended [EXT-COM] Ramachandra, S., Tappan, D., and Rekter Y. "BGP Extended
Communities Attribute", draft-ramachandra-bgp-ext-communities-02.txt Communities Attribute", draft-ramachandra-bgp-ext-communities-02.txt
[RFC1997] Chandra, R., Traina, P. and T. Li, "BGP Communities [RFC1997] Chandra, R., Traina, P. and T. Li, "BGP Communities
 End of changes. 

This html diff was produced by rfcdiff 1.23, available from http://www.levkowetz.com/ietf/tools/rfcdiff/