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SDR Working Group K. Varadhan
INTERNET DRAFT USC
September 13, 1993
Expiration Date: March 12, 1993
BGP SDRP_SPEAKERS Attribute
Status of this Memo
This document specifies an attribute to be added to BGP-4 to allow
SDRP speakers in different domains to identify one another through
BGP-4.
This document is an Internet Draft, and can be found as draft-ietf-
sdr-sdrp-speakers-00.txt in any standard internet drafts repository.
Internet Drafts are working documents of the Internet Engineering
Task Force (IETF), its Areas, and its Working Groups. Note that
other groups may also distribute working documents as Internet
Drafts.
Internet Drafts are draft documents valid for a maximum of six
months. Internet Drafts may be updated, replaced, or obsoleted by
other documents at any time. It is not appropriate to use Internet
Drafts as reference material or to cite them other than as a
``working draft'' or ``work in progress.''
1. Attribute Name and Code
SDRP_SPEAKERS 8
2. Attribute Meanings
The BGP attribute[3] SDRP_SPEAKERS is an optional, transitive
attrribute. The attribute value is a tuple <d-i length, d-i set>:
d-i length
is a 2-octet field, indicating the number of SDRP[1]
speakers encoded in the d-i set.
d-i set
is a set of tuples <domain identifier, IP address>:
"domain identifier" is a 2-octet field; it indicates
the AS number of the autonomous system containing the
Expiration Date March 12 1993 [Page 1]
INTERNET DRAFT September 93
SDRP speaker.
"IP address" is a 4-octet field indicating the IP
address of the SDRP speaker in the given domain.
This attribute is defined for BGP-4. Throught the rest of this
document, when referring to BGP, we always mean BGP-4, as
defined in [3].
3. Motivation for the Attribute
The early prototype implementations of SDRP expect to use BGP/IDRP
date to populate the D-FIB. The proposed attribute will allow SDRP
speakers in different domains to identify one another.
4. Description of the Attribute
Each BGP speaker in a domain, that has SDRP speakers configured in
the domain, may add this attribute to routes that it generates.
A BGP speaker that learns of a route containing this attribute
MAY pass the attribute on unchanged to other adjacent BGP
speaker.
A BGP speaker that aggregates multiple routes into one MAY
combine the 2 attributes into one SDRP_SPEAKERS attribute, and
MAY advertise anything from the combined set.
5. Security Considerations
Security Considerations are not discussed in this memo.
6. Author's Addresses
Kannan Varadhan
Dept. of Computer Science,
University of Southern California,
Los Angeles, Ca 90087.
kannan@caldera.usc.edu
Expiration Date March 12 1993 [Page 2]
INTERNET DRAFT September 93
References
[1] Deborah Estrin, Daniel Zappala, Tony Li, and Yakov Rekhter.
``Source demand routing: Packet format and forwarding specification
(version 1)''. Internet Draft, In Preparation, March 1993.
[2] Vince Fuller, Tony Li, Jessica Yu, and Kannan Varadhan.
``Supernetting: an address assignment and aggregation strategy''.
Internet Draft, In Preparation, July 1992.
[3] Yakov Rekhter and Tony Li. ``A border gateway protocol 4 (BGP-4)''.
Internet Draft, In Preparation, June 1992.
Expiration Date March 12 1993 [Page 3]