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- SDR Working Group K. Varadhan
- INTERNET DRAFT USC
- September 13, 1993
- Expiration Date: March 12, 1993
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- BGP SDRP_SPEAKERS Attribute
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- Status of this Memo
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- 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.
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- 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.''
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- 1. Attribute Name and Code
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- SDRP_SPEAKERS 8
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- 2. Attribute Meanings
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- The BGP attribute[3] SDRP_SPEAKERS is an optional, transitive
- attrribute. The attribute value is a tuple <d-i length, d-i set>:
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- d-i length
- is a 2-octet field, indicating the number of SDRP[1]
- speakers encoded in the d-i set.
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- d-i set
- is a set of tuples <domain identifier, IP address>:
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- "domain identifier" is a 2-octet field; it indicates
- the AS number of the autonomous system containing the
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- Expiration Date March 12 1993 [Page 1]
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- INTERNET DRAFT September 93
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- SDRP speaker.
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- "IP address" is a 4-octet field indicating the IP
- address of the SDRP speaker in the given domain.
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- 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].
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- 3. Motivation for the Attribute
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- 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.
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- 4. Description of the Attribute
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- Each BGP speaker in a domain, that has SDRP speakers configured in
- the domain, may add this attribute to routes that it generates.
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- A BGP speaker that learns of a route containing this attribute
- MAY pass the attribute on unchanged to other adjacent BGP
- speaker.
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- 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.
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- 5. Security Considerations
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- Security Considerations are not discussed in this memo.
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- 6. Author's Addresses
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- Kannan Varadhan
- Dept. of Computer Science,
- University of Southern California,
- Los Angeles, Ca 90087.
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- kannan@caldera.usc.edu
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- Expiration Date March 12 1993 [Page 2]
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- INTERNET DRAFT September 93
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- References
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- [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.
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- [2] Vince Fuller, Tony Li, Jessica Yu, and Kannan Varadhan.
- ``Supernetting: an address assignment and aggregation strategy''.
- Internet Draft, In Preparation, July 1992.
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- [3] Yakov Rekhter and Tony Li. ``A border gateway protocol 4 (BGP-4)''.
- Internet Draft, In Preparation, June 1992.
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- Expiration Date March 12 1993 [Page 3]
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