draft-ietf-idr-cease-subcode-06.txt   draft-ietf-idr-cease-subcode-07.txt 
Network Working Group Enke Chen Network Working Group Enke Chen
Internet Draft Cisco Systems Internet Draft Cisco Systems
Expiration Date: December 2005 Vincent Gillet Expiration Date: July 2006 Vincent Gillet
France Telecom France Telecom
Subcodes for BGP Cease Notification Message Subcodes for BGP Cease Notification Message
draft-ietf-idr-cease-subcode-06.txt draft-ietf-idr-cease-subcode-07.txt
1. Status of this Memo Status of this Memo
By submitting this Internet-Draft, each author represents that any By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware applicable patent or other IPR claims of which he or she is aware
have been or will be disclosed, and any of which he or she becomes have been or will be disclosed, and any of which he or she becomes
aware will be disclosed, in accordance with Section 6 of BCP 79. aware will be disclosed, in accordance with Section 6 of BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
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other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
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and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html. http://www.ietf.org/shadow.html.
2. Abstract Abstract
This document defines several subcodes for the BGP Cease NOTIFICATION This document defines several subcodes for the BGP Cease NOTIFICATION
message that would provide more information to aid network operators message that would provide more information to aid network operators
in correlating network events and diagnosing BGP peering issues. in correlating network events and diagnosing BGP peering issues.
3. Specification of Requirements 1. Specification of Requirements
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC-2119]. document are to be interpreted as described in RFC 2119 [RFC-2119].
4. Introduction 2. Introduction
This document defines several subcodes for the BGP Cease NOTIFICATION This document defines several subcodes for the BGP Cease NOTIFICATION
message that would provide more information to aid network operators message that would provide more information to aid network operators
in correlating network events and diagnosing BGP peering issues. in correlating network events and diagnosing BGP peering issues. It
also recommends that a BGP speaker implement a backoff mechanism in
re-trying a BGP connection after the speaker receives a NOTIFICATION
message with certain CEASE subcode.
5. Subcode Definition 3. Subcode Definition
The following subcodes are defined for the Cease NOTIFICATION The following subcodes are defined for the Cease NOTIFICATION
message: message:
Subcode Symbolic Name Subcode Symbolic Name
1 Maximum Number of Prefixes Reached 1 Maximum Number of Prefixes Reached
2 Administrative Shutdown 2 Administrative Shutdown
3 Peer De-configured 3 Peer De-configured
4 Administrative Reset 4 Administrative Reset
5 Connection Rejected 5 Connection Rejected
6 Other Configuration Change 6 Other Configuration Change
7 Connection Collision Resolution 7 Connection Collision Resolution
8 Out of Resources 8 Out of Resources
6. Subcode Usage 4. Subcode Usage
If a BGP speaker decides to terminate its peering with a neighbor If a BGP speaker decides to terminate its peering with a neighbor
because the number of address prefixes received from the neighbor because the number of address prefixes received from the neighbor
exceeds a locally configured upper bound (as described in [BGP-4]), exceeds a locally configured upper bound (as described in [BGP-4]),
then the speaker MUST send to the neighbor a NOTIFICATION message then the speaker MUST send to the neighbor a NOTIFICATION message
with the Error Code Cease, and the Error Subcode "Maximum Number of with the Error Code Cease, and the Error Subcode "Maximum Number of
Prefixes Reached". The message MAY optionally include the Address Prefixes Reached". The message MAY optionally include the Address
Family information [BGP-MP] and the upper bound in the "Data" field Family information [BGP-MP] and the upper bound in the "Data" field
as shown in Figure 1 where the meaning and use of the <AFI, SAFI> as shown in Figure 1 where the meaning and use of the <AFI, SAFI>
tuple is the same as defined in [BGP-MP, sect. 7]. tuple is the same as defined in [BGP-MP, sect. 7].
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If a BGP speaker decides to send a NOTIFICATION message with the If a BGP speaker decides to send a NOTIFICATION message with the
Error Code Cease as a result of the collision resolution procedure Error Code Cease as a result of the collision resolution procedure
(as described in [BGP-4]), then the subcode SHOULD be set to (as described in [BGP-4]), then the subcode SHOULD be set to
"Connection Collision Resolution". "Connection Collision Resolution".
If a BGP speaker runs out of resources (e.g., memory) and decides to If a BGP speaker runs out of resources (e.g., memory) and decides to
reset a session, then the speaker MAY send a NOTIFICATION message reset a session, then the speaker MAY send a NOTIFICATION message
with the Error Code Cease, and the Error Subcode "Out of Resources". with the Error Code Cease, and the Error Subcode "Out of Resources".
It is RECOMMENDED that a BGP speaker implement a backoff mechanism in It is RECOMMENDED that a BGP speaker behave as though the
DampPeerOscillations attribute [BGP-4] was true for this peer when
re-trying a BGP connection after the speaker receives a Cease re-trying a BGP connection after the speaker receives a Cease
NOTIFICATION message with subcode of "Administrative Shutdown", or NOTIFICATION message with subcode of "Administrative Shutdown", or
"Peer De-configured", or "Connection Rejected", or "Out of "Peer De-configured", or "Connection Rejected", or "Out of
Resources". An implementation SHOULD impose an upper bound on the Resources". An implementation SHOULD impose an upper bound on the
number of consecutive automatic retries. Once this bound is reached, number of consecutive automatic retries. Once this bound is reached,
the implementation would stop re-trying any BGP connections until the implementation would stop re-trying any BGP connections until
some administrative intervention. some administrative intervention, i.e., set the AllowAutomaticStart
attribute [BGP-4] to FALSE.
7. IANA Considerations 5. IANA Considerations
This document defines the subcodes 1 - 8 for the BGP Cease This document defines the subcodes 1 - 8 for the BGP Cease
NOTIFICATION message. Future assignments are to be made using either NOTIFICATION message. Future assignments are to be made using either
the Standards Action process defined in [RFC-2434], or the Early IANA the Standards Action process defined in [RFC-2434], or the Early IANA
Allocation process defined in [kompella-zinin], or the "First Come Allocation process defined in [RFC-4020]. Assignments consist of a
First Served" policy defined in [RFC-2434]. name and the value.
8. Security Considerations 6. Security Considerations
This extension to BGP does not change the underlying security issues This extension to BGP does not change the underlying security issues
inherent in the existing BGP. inherent in the existing BGP.
9. Acknowledgments 7. Acknowledgments
The authors would like to thank Yakov Rekhter, Pedro Marques, Andrew The authors would like to thank Yakov Rekhter, Pedro Marques, Andrew
Lange and Don Goodspeed for their review and suggestions. Lange and Don Goodspeed for their review and suggestions.
10. Normative References 8. References
[BGP-4] Y. Rekhter, T. Li and S. Hares, "A Border Gateway Protocol 4 8.1. Normative References
(BGP-4)", <draft-ietf-idr-bgp4-26.txt>, October 2004.
[BGP-4] Y. Rekhter, T. Li and S. Hares, Eds., "A Border Gateway
Protocol 4 (BGP-4)", RFC 4271, January 2006.
[BGP-MP] Bates, T., Chandra, R., Katz, D. and Y. Rekhter, [BGP-MP] Bates, T., Chandra, R., Katz, D. and Y. Rekhter,
"Multiprotocol Extensions for BGP-4", RFC 2858, June 2000. "Multiprotocol Extensions for BGP-4", RFC 2858, June 2000.
[RFC-2434] Narten, T., Alvestrand, H., "Guidelines for Writing an [RFC-2434] Narten, T., Alvestrand, H., "Guidelines for Writing an
IANA Considerations Section in RFCs", RFC 2434, October 1998. IANA Considerations Section in RFCs", RFC 2434, October 1998.
[RFC-2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC-2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997. Requirement Levels", BCP 14, RFC 2119, March 1997.
11. Non-normative References 8.2. Informative References
[kompella-zinin] Kompella, K., Zinin, A., "Early IANA Allocation of [RFC-4020] Kompella, K. and A. Zinin, "Early IANA Allocation of
Standards Track Codepoints", Work in progress Standards Track Code Points", BCP 100, RFC 4020, February 2005.
12. Author Information 9. Author Information
Enke Chen Enke Chen
Cisco Systems, Inc. Cisco Systems, Inc.
170 W. Tasman Dr. 170 W. Tasman Dr.
San Jose, CA 95134 San Jose, CA 95134
USA
Email: enkechen@cisco.com Email: enkechen@cisco.com
Vincent Gillet Vincent Gillet
France Telecom Longues Distances France Telecom Longues Distances
61, rue des Archives 61, rue des Archives
75003 Paris FRANCE 75003 Paris FRANCE
Email: vgi@opentransit.net Email: vgi@opentransit.net
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found in BCP 78 and BCP 79. found in BCP 78 and BCP 79.
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such proprietary rights by implementers or users of this such proprietary rights by implementers or users of this
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Copyright (C) The Internet Society (2005). Copyright (C) The Internet Society (2006).
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