Internet DRAFT - draft-bao-idr-flowspec-statistics
draft-bao-idr-flowspec-statistics
IDR Working Group L. Bao
Internet-Draft Huawei Technologies
Intended status: Standards Track 8 December 2023
Expires: 10 June 2024
BGP Flow Specification Extensions for Traffic Statistics
draft-bao-idr-flowspec-statistics-00
Abstract
RFC8955 defines a Border Gateway Protocol Network Layer Reachability
Information (BGP NLRI) encoding format that can be used to distribute
(intra-domain and inter-domain) traffic Flow Specifications for IPv4
unicast and IPv4 BGP/MPLS VPN services. This allows the routing
system to propagate information regarding more specific components of
the traffic aggregate defined by an IP destination prefix. It also
specifies BGP Extended Community encoding formats, which can be used
to propagate Traffic Filtering Actions along with the Flow
Specification NLRI. Those Traffic Filtering Actions encode actions a
routing system can take if the packet matches the Flow Specification.
This document extends RFC 8955 with New traffic Filtering Actions.
statistic for bytes rate per second and statistic for packets rate
per second are useful in specified Flow processing scenario.
Status of This Memo
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This Internet-Draft will expire on 10 June 2024.
Copyright Notice
Copyright (c) 2023 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Please review these documents carefully, as they describe your rights
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 2
2. Traffic Filtering Actions . . . . . . . . . . . . . . . . . . 3
3. Security Considerations . . . . . . . . . . . . . . . . . . . 3
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 4
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.1. Normative References . . . . . . . . . . . . . . . . . . 4
6.2. Informative References . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
[RFC8955] obsoletes "Dissemination of Flow Specification Rules"
[RFC5575] (see Appendix B for the differences). This document also
obsoletes "Clarification of the Flowspec Redirect Extended Community"
[RFC7674], since it incorporates the encoding of the BGP Flow
Specification Redirect Extended Community in Section 7.4.
When performing an action on a flow, you need to continuously observe
the flow status, whether packets are continuously sent, and the
statistic bytes rate and packets rate for the Flow Specification.
This allows you to perform the next step on the flow. Therefore, the
Action field in section 7.3 of [RFC8955] needs to be extended to add
an action for flow statistics.
1.1. Requirements Language
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
BCP14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
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2. Traffic Filtering Actions
Traffic-Action (traffic-action) Sub-Type 0x07 is defined in [RFC8955]
(see Section 7.2). The traffic-action Extended Community consists of
6 octets of which only the 2 least significant bits of the 6th octet
(from left to right) are defined by this document, as shown in
Figure 1.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Traffic Action Field |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tr. Action Field (cont.) |S|T|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: Traffic-Action Extended Community Encoding
The S and T bit are defined as:
T Terminal Action (bit 47): When this bit is set, the traffic
filtering engine will evaluate any subsequent Flow Specifications
(as defined by the ordering procedure in RFC8955 Section 5.1). If
not set, the evaluation of the traffic filters stops when this
Flow Specification is evaluated.
S Sample (bit 46): Enables traffic sampling and logging for this
Flow Specification (only effective when set).
Other 2 significant bits of the 6th octet of traffic-action is
required to identify and indicate the action of statistics. One bit
is statistic-rate-bytes on a flow at an interval of per second.
Another bit is statistic-rate-packets on a flow at an interval of per
second.
SRB Statistic rate bytes per second (bit TBD ): Enables traffic
statistic for this Flow Specification for bytes rate per second.
SRP Statistic rate packets per second (bit TBD ): Enables traffic
statistic for this Flow Specification for packets rate per second.
3. Security Considerations
TBD
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4. IANA Considerations
The "traffic-action" Extended Community (Section 7.3) defined in
[RFC8955] has 46 unused bits, which can be used to convey additional
meaning. IANA created and maintains a registry entitled "Traffic
Action Fields". IANA has updated the reference for this registry to
RFC 8955. as shown in Figure 2.
Two new bits in the Traffic Action Field field are required for
statistic-rate-bytes and statistic-rate-packets. The Bit Field and
Reference are TBD.
+=====+=======================+===========+
| Bit | Name | Reference |
+=====+=======================+===========+
| 47 | Terminal Action | RFC 8955 |
+-----+-----------------------+-----------+
| 46 | Sample | RFC 8955 |
+-----+-----------------------+-----------+
| TBD | statistic-rate-bytes | TBD |
+-----+-----------------------+-----------+
| TBD | statistic-rate-packets| TBD |
+-----+-----------------------+-----------+
Figure 2: Registry: Traffic Action Fields
5. Acknowledgments
The authors would like to thank Guoqi Xu, Lei Bao, Haibo Wang and
Shunwan Zhuang for their review and discussion of this document.
6. References
6.1. 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>.
[RFC5575] Marques, P., Sheth, N., Raszuk, R., Greene, B., Mauch, J.,
and D. McPherson, "Dissemination of Flow Specification
Rules", RFC 5575, DOI 10.17487/RFC5575, August 2009,
<https://www.rfc-editor.org/info/rfc5575>.
[RFC7674] Haas, J., Ed., "Clarification of the Flowspec Redirect
Extended Community", RFC 7674, DOI 10.17487/RFC7674,
October 2015, <https://www.rfc-editor.org/info/rfc7674>.
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[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>.
[RFC8955] Loibl, C., Hares, S., Raszuk, R., McPherson, D., and M.
Bacher, "Dissemination of Flow Specification Rules",
RFC 8955, DOI 10.17487/RFC8955, December 2020,
<https://www.rfc-editor.org/info/rfc8955>.
6.2. Informative References
Author's Address
Lei Bao
Huawei Technologies
Email: baolei7@huawei.com
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