Internet DRAFT - draft-yan-sidrops-roa-considerations
draft-yan-sidrops-roa-considerations
SIDR Operations Z. Yan
Internet-Draft CNNIC
Intended status: Informational R. Bush
Expires: September 26, 2021 Internet Initiative Japan
G. Geng
Jinan University
J. Yao
CNNIC
March 25, 2021
Problem Statement and Considerations for ROAs issued with Multiple
Prefixes
draft-yan-sidrops-roa-considerations-06
Abstract
The address space holder needs to issue an ROA object when it
authorizes one or more ASes to originate routes to multiple prefixes.
During the process of ROA issuance, the address space holder needs to
specify an origin AS for a list of IP prefixes. Besides, the address
space holder has a free choice to put multiple prefixes into a single
ROA or issue separate ROAs for each prefix based on the current
specification. This memo analyzes and presents some operational
problems which may be caused by the misconfigurations of ROAs
containing multiple IP prefixes. Some suggestions and considerations
also have been proposed.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on September 26, 2021.
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Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Problem statement and Analysis . . . . . . . . . . . . . . . 3
4. Suggestions and Considerations . . . . . . . . . . . . . . . 3
5. Security Considerations . . . . . . . . . . . . . . . . . . . 4
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
8.1. Normative References . . . . . . . . . . . . . . . . . . 5
8.2. Informative References . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
Route Origin Authorization (ROA) is a digitally signed object which
is used to identify that a single AS has been authorized by the
address space holder to originate routes to one or more prefixes
within the address space[RFC6482].If the address space holder needs
to authorize more than one ASes to advertise the same set of address
prefixes, the holder must issue multiple ROAs, one per AS number.
However, at present there are no mandatory requirements in any RFCs
describing that the address space holders must issue a separate ROA
for each prefix or a ROA for multiple prefixes.
Each ROA contains an "asID" field and an "ipAddrBlocks" field. The
"asID" field contains one single AS number which is authorized to
originate routes to the given IP address prefixes. The
"ipAddrBlocks" field contains one or more IP address prefixes to
which the AS is authorized to originate the routes. The ROAs with
multiple prefixes is a common case that each ROA contains exactly one
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AS number but may contain multiple IP address prefixes in the
operational process of ROA issuance.
2. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
3. Problem statement and Analysis
As mentioned above, the address space holder needs to issue an ROA
object when it authorizes one or more ASes to originate routes to
multiple prefixes. During the process of ROA issuance, the address
space holder needs to specify an origin AS for a list of IP prefixes.
Besides, the address space holder has a free choice to put multiple
prefixes into a single ROA or issue separate ROAs for each prefix
based on the current specification.
In reality, the address space holders tend to issue each ROA object
with fewer IP prefixes, but they still tend to put multiple prefixes
into one single ROA.
A large number of experiments for the process of ROA issuance have
been made on our RPKI testbed, it is found that the misconfigurations
during the issuance may cause the ROAs which have been issued to be
revoked.
Another potential influence of misconfigurations of ROAs containing
multiple IP prefixes on BGP routers may be considered. For the ROA
containing multiple prefixes, once increase or delete one <AS,
ip_prefix> pair in it, this ROA will be reissued. Through
sychronization with repository, RPs fetch a new ROA object and then
notify and send all the <AS, ip_prefix> pairs in this ROA to BGP
routers. That is to say, the update of the ROA containing multiple
IP address prefixes will lead to redundant transmission between RP
and BGP routers . So frequent update of these ROAs will increase the
convergency time of BGP routers and reduce their performance
obviously.
4. Suggestions and Considerations
Based on the statistical and experimental analysis, following
suggestions should be considered during the process of ROA issuance:
1) The issuance of ROAs containing a large number of IP prefixes may
lead to misconfigurations more easily than ROAs with fewer IP
prefixes.
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A ROA which contains a large number of IP prefixes is more vulnerable
to misconfigurations, because any misconfiguration of these prefixes
may cause the legitimate ROA to be revoked. Besides, since the
misconfigurations of ROAs containing a larger number of IP address
prefixes may lead to much more serious consequences (a large-scale
network interruption) than ROAs with fewer IP address prefixes, it is
suggested to avoid issuing ROAs with a large number of IP address
prefixes.
2) The number of ROAs containing multiple IP prefixes should be
limited and the number of IP prefixes in each ROA should also be
limited.
The extreme case (a single ROA can only contain one IP address
prefix) may lead to too many ROA objects globally, which may in turn
become a burden for RPs to synchronize and validate all these ROA
objects with the fully deployment of RPKI. So a tradeoff between the
number of ROAs and the number of IP prefixes in a single ROA should
be considered.
3) A safeguard scheme is essential to protect the process of ROA
issuance
Considering the misconfigurations during the process of ROA issuance
are inevitable and the serious consequences they may lead to, a
safeguard scheme to protect and monitor the process of ROA issuance
should be considered.
5. Security Considerations
TBD.
6. IANA Considerations
This document does not request any IANA action.
7. Acknowledgements
The authors would like to thanks the valuable comments made by
members of sidrops WG.
This document was produced using the xml2rfc tool [RFC2629].
8. References
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8.1. 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>.
[RFC6482] Lepinski, M., Kent, S., and D. Kong, "A Profile for Route
Origin Authorizations (ROAs)", RFC 6482,
DOI 10.17487/RFC6482, February 2012,
<https://www.rfc-editor.org/info/rfc6482>.
8.2. Informative References
[RFC2629] Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629,
DOI 10.17487/RFC2629, June 1999,
<https://www.rfc-editor.org/info/rfc2629>.
Authors' Addresses
Zhiwei Yan
CNNIC
No.4 South 4th Street, Zhongguancun
Beijing, 100190
P.R. China
Email: yanzhiwei@cnnic.cn
Randy Bush
Internet Initiative Japan
Email: randy@psg.com
Guanggang Geng
Jinan University
No.601, West Huangpu Avenue
Guangzhou 510632
China
Email: gggeng@jnu.edu.cn
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Jiankang Yao
CNNIC
No.4 South 4th Street, Zhongguancun
Beijing, 100190
P.R. China
Email: yaojk@cnnic.cn
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