Internet DRAFT - draft-carpenter-anima-grasp-config
draft-carpenter-anima-grasp-config
ANIMA B.E. Carpenter
Internet-Draft Univ. of Auckland
Intended status: Standards Track 21 September 2021
Expires: 25 March 2022
GRASP Configuration Management Objective
draft-carpenter-anima-grasp-config-00
Abstract
This document specifies a technical objective for dynamic
configuration of the GeneRic Autonomic Signaling Protocol (GRASP)
defined by RFC 8990.
Status of This Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Format of the GRASP Objective . . . . . . . . . . . . . . . . 2
4. Validation . . . . . . . . . . . . . . . . . . . . . . . . . 3
5. Implementation Status [RFC Editor: please remove] . . . . . . 4
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
7. Security Considerations . . . . . . . . . . . . . . . . . . . 4
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
9.1. Normative References . . . . . . . . . . . . . . . . . . 4
9.2. Informative References . . . . . . . . . . . . . . . . . 5
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 5
A.1. Draft-00 . . . . . . . . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
The GeneRic Autonomic Signaling Protocol (GRASP) is specified in
[RFC8990]. It has a few parameters that might need configuration to
non-standard values, but since any form of manual configuration is to
be avoided in an autonomic network, this document describes how GRASP
can configure itself within a given autonomic network. For the
general model of such a network, see [RFC8993].
The method is for an authoritative source in the autonomic network,
most likely associated with the Network Operations Center (NOC), to
use GRASP's flooding mechanism to periodically distribute a GRASP
objective (as defined in [RFC8990]) to all GRASP nodes in that
network. Each node will then validate the contents of the objective
as much as possible, and then apply any relevant configuration
changes locally.
2. Terminology
The key words "*MUST*", "*MUST NOT*", "*REQUIRED*", "*SHALL*",
"*SHALL NOT*", "*SHOULD*", "*SHOULD NOT*", "*RECOMMENDED*", "*NOT
RECOMMENDED*", "*MAY*", and "*OPTIONAL*" in this document are to be
interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only
when, they appear in all capitals, as shown here.
3. Format of the GRASP Objective
The formal definition of the GRASP objective is as follow, defined in
fragmentary CDDL [RFC8610].
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objective = ["GraspConfig", objective-flags, loop-count, objective-value]
loop-count = 0..255 ; as in the GRASP specification
objective-flags /= ; as in the GRASP specification
objective-value /= { 1*gc-element }
gc-element = ( gc-element-codepoint => gc-element-value )
gc-element-codepoint = uint
gc-element-value = any
Initially, the following codepoints are defined:
gc-element-codepoint //= ( &(sender:0) => ipv6-address )
ipv6-address = bytes .size 16
This provides the address of the original sender of the flooded
objective.
gc-element-codepoint //= ( &(sender-loop-count:1) => 1..255 )
This provides the original loop count at the sender, so that the
receiver can compute how many hops the flood has taken.
gc-element-codepoint //= ( &(grasp-version:2) => 1..255 )
At the moment there is only one version of GRASP. This element is
reserved for possible future use.
gc-element-codepoint //= ( &(max-multicast:3) => 1..65535 )
gc-element-codepoint //= ( &(max-unicast:4) => 1..65535 )
These elements can be used to change the default maximum message
sizes for multicast and unicast GRASP messages respectively. The
sizes *MUST NOT* be reduced below the default specified by [RFC8990].
4. Validation
Upon receipt of a changed configuration element, each GRASP node
*MUST* validate it to the extent possible. The sender and sender-
loop-count elements may be used as part of the validation process.
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5. Implementation Status [RFC Editor: please remove]
An experimental Autonomic Service Agent (ASA) supporting the
"GraspConfig" objective has been added to the Python prototype
implementation of GRASP. This ASA periodically checks for the
flooded objective and reconfigures GRASP's multicast and unicast
maximum message sizes accordingly. Another experimental ASA has been
implemented to periodically flood the "GraspConfig" objective as
would be done by a NOC, based on a JSON file expressing the required
configuration. No problems were observed while running these two
ASAs at the same time as other GRASP operations. Code is on Github
(https://github.com/becarpenter/graspy).
6. IANA Considerations
This document defines a new GRASP Objective Option name,
"GraspConfig". The IANA is requested to add this to the GRASP
Objective Names Table registry defined by [RFC8990] (if approved).
Open issue: Should IANA also register the gc-element-codepoints? (A
similar registration is described in [I-D.eckert-anima-grasp-dnssd]
for the proposed "SRV." group of GRASP objectives. Another option
would be to change "GraspConfig" to "SRV.GraspConfig".)
7. Security Considerations
The security considerations of [RFC8990] apply.
8. Acknowledgements
TBD
9. References
9.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
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[RFC8610] Birkholz, H., Vigano, C., and C. Bormann, "Concise Data
Definition Language (CDDL): A Notational Convention to
Express Concise Binary Object Representation (CBOR) and
JSON Data Structures", RFC 8610, DOI 10.17487/RFC8610,
June 2019, <https://www.rfc-editor.org/info/rfc8610>.
[RFC8990] Bormann, C., Carpenter, B., Ed., and B. Liu, Ed., "GeneRic
Autonomic Signaling Protocol (GRASP)", RFC 8990,
DOI 10.17487/RFC8990, May 2021,
<https://www.rfc-editor.org/info/rfc8990>.
9.2. Informative References
[I-D.eckert-anima-grasp-dnssd]
Eckert, T., Boucadair, M., Jacquenet, C., and M. H.
Behringer, "DNS-SD Compatible Service Discovery in GeneRic
Autonomic Signaling Protocol (GRASP)", Work in Progress,
Internet-Draft, draft-eckert-anima-grasp-dnssd-02, 12 July
2021, <https://datatracker.ietf.org/doc/html/draft-eckert-
anima-grasp-dnssd-02>.
[RFC8993] Behringer, M., Ed., Carpenter, B., Eckert, T., Ciavaglia,
L., and J. Nobre, "A Reference Model for Autonomic
Networking", RFC 8993, DOI 10.17487/RFC8993, May 2021,
<https://www.rfc-editor.org/info/rfc8993>.
Appendix A. Change Log
A.1. Draft-00
* Original version
Author's Address
Brian E. Carpenter
The University of Auckland
School of Computer Science
PB 92019
Auckland 1142
New Zealand
Email: brian.e.carpenter@gmail.com
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