LSR R. Chen
Internet-Draft D. Zhao
Intended status: Standards Track ZTE Corporation
Expires: 2 September 2024 1 March 2024
Signaling MNA Capability Using IGP and BGP-LS
draft-chen-lsr-mpls-mna-capability-01
Abstract
This document defines a mechanism to signal MNA Capability using IGP
and Border Gateway Protocol-Link State(BGP-LS).
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This Internet-Draft will expire on 2 September 2024.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Advertising MNA Using IS-IS . . . . . . . . . . . . . . . . . 3
3. Advertising MNA Using OSPF . . . . . . . . . . . . . . . . . 4
4. Signaling MNA in BGP-LS . . . . . . . . . . . . . . . . . . . 4
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
7. Security Considerations . . . . . . . . . . . . . . . . . . . 5
8. Normative References . . . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
[I-D.ietf-mpls-mna-fwk] specifies an architectural framework for the
MPLS Network Actions (MNA) technologies. MNA technologies are used
to indicate actions for Label Switched Paths (LSPs) and MPLS packets
to transfer data needed for these actions.
[I-D.ietf-mpls-mna-hdr] defines the syntax and semantics of network
actions encoded within an MPLS Label Stack. Network actions can be
encoded with or without Ancillary Data (AD), either in or after the
label stack. It defines four types of Label Stack Entry Formats.
However, for the same network action, multiple encoding format are
defined. For example, [I-D.li-mpls-mna-entropy]describes a network
action for entropy and uses LSE Format C to encoded entropy action
within an MPLS Label Stack. [RFC6790]defines MPLS encapsulation with
ELI and entropy labels; [I-D.li-mpls-mna-nrp-selector] describes a
network action for NRP Selector, and it defines LSE Format B or LSE
Format C maybe used to carry the NRP Selector.
The ingress node /Controller should obtain the network action of the
nodes within the MNA infrastructure, which ensure that the
encapsulated data packets by the ingress node can be correctly parsed
by the on-path nodes.
This document defines how the ingress node knows of the network
action all the on-path nodes within the MNA infrastructure. It
defines a mechanism to signal the MPLS Network actions(MNA) using IGP
and BGP-LS.
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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 BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
2. Advertising MNA Using IS-IS
This section defines the MNA-Capabilities Sub-TLV that are inserted
into the IS-IS Router Capability that is defined in [RFC7981].
The format of the MNA-Capabilities Sub-TLV is:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |P|C|N|S|E|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1
where:
Type: TBD.
Length: 4.
Flags: 4 octet of flags. The following are defined:
* E: Entropy flag. If set, then the router is capable of processing
Entropy action in LSE Format B on all interfaces.
* S: 13-bit NRP Selector flag. If set, then the router is capable
of processing 13-bit NRP Selector (NRPS13) on all interfaces.
* N: 20-bit NRP Selector (NRPS20). If set, then the router is
capable of processing 20-bit NRP Selector (NRPS13) on all
interfaces.
* C: 20-bit Entropy and NRP Selector (ENRPS20). If set, then the
router is capable of processing 20-bit Entropy and NRP Selector
(ENRPS20) on all interfaces.
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* P: Performance Measurement with Alternate Marking Method (PMAMM)
flag. If set, then the router is capable of processing PMAMM on
all interfaces.
The TLVs defined in this section are applicable to both OSPFv2,
OSPFv3 and BGP-LS.
3. Advertising MNA Using OSPF
This section defines the MNA-Capabilities TLV that are inserted into
the Router Information Opaque LSA（for OSPFv2）and OSPFv3 Router
Information Opaque LSA（for OSPFv3）(defined in [RFC7770]). The format
of the MNA-Capabilities TLV is the same as section 2.
4. Signaling MNA in BGP-LS
The IGP extensions defined in this document can be advertised via
BGP-LS (distribution of Link-State and Traffic Engineering
information using BGP) [RFC7752] using existing BGP-LS TLVs.
This section defines the following Node Attribute TLV:
+============+==============================+
| Type | Description |
+============+==============================+
| TBD | the MNA-Capabilities TLV |
+------------+------------------------------+
Figure 2
5. Acknowledgements
TBD.
6. IANA Considerations
TBD.
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7. Security Considerations
Procedures and protocol extensions defined in this document do not
affect the IS-IS, OSPFv2 , OSPFv3 and BGP security model. See the
"Security Considerations"section of [RFC7981] for a discussion of IS-
IS security, [RFC7684] for a discussion of OSPFv2 security, the
"Security Considerations"section of [RFC8362] for a discussion of
OSPFv3 security and [RFC4271] for a discussion of OSPFv2 security.
8. Normative References
[I-D.ietf-mpls-mna-fwk]
Andersson, L., Bryant, S., Bocci, M., and T. Li, "MPLS
Network Actions Framework", Work in Progress, Internet-
Draft, draft-ietf-mpls-mna-fwk-06, 24 January 2024,
<https://datatracker.ietf.org/doc/html/draft-ietf-mpls-
mna-fwk-06>.
[I-D.ietf-mpls-mna-hdr]
Rajamanickam, J., Gandhi, R., Zigler, R., Song, H., and K.
Kompella, "MPLS Network Action (MNA) Sub-Stack Solution",
Work in Progress, Internet-Draft, draft-ietf-mpls-mna-hdr-
04, 21 October 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-mpls-
mna-hdr-04>.
[I-D.li-mpls-mna-entropy]
Li, T. and J. Drake, "MPLS Network Action for Entropy",
Work in Progress, Internet-Draft, draft-li-mpls-mna-
entropy-01, 25 April 2023,
<https://datatracker.ietf.org/doc/html/draft-li-mpls-mna-
entropy-01>.
[I-D.li-mpls-mna-nrp-selector]
Li, T., Drake, J., Beeram, V. P., Saad, T., and I. Meilik,
"MPLS Network Actions for Network Resource Partition
Selector", Work in Progress, Internet-Draft, draft-li-
mpls-mna-nrp-selector-00, 5 May 2023,
<https://datatracker.ietf.org/doc/html/draft-li-mpls-mna-
nrp-selector-00>.
[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>.
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[RFC4271] Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A
Border Gateway Protocol 4 (BGP-4)", RFC 4271,
DOI 10.17487/RFC4271, January 2006,
<https://www.rfc-editor.org/info/rfc4271>.
[RFC6790] Kompella, K., Drake, J., Amante, S., Henderickx, W., and
L. Yong, "The Use of Entropy Labels in MPLS Forwarding",
RFC 6790, DOI 10.17487/RFC6790, November 2012,
<https://www.rfc-editor.org/info/rfc6790>.
[RFC7684] Psenak, P., Gredler, H., Shakir, R., Henderickx, W.,
Tantsura, J., and A. Lindem, "OSPFv2 Prefix/Link Attribute
Advertisement", RFC 7684, DOI 10.17487/RFC7684, November
2015, <https://www.rfc-editor.org/info/rfc7684>.
[RFC7752] Gredler, H., Ed., Medved, J., Previdi, S., Farrel, A., and
S. Ray, "North-Bound Distribution of Link-State and
Traffic Engineering (TE) Information Using BGP", RFC 7752,
DOI 10.17487/RFC7752, March 2016,
<https://www.rfc-editor.org/info/rfc7752>.
[RFC7770] Lindem, A., Ed., Shen, N., Vasseur, JP., Aggarwal, R., and
S. Shaffer, "Extensions to OSPF for Advertising Optional
Router Capabilities", RFC 7770, DOI 10.17487/RFC7770,
February 2016, <https://www.rfc-editor.org/info/rfc7770>.
[RFC7981] Ginsberg, L., Previdi, S., and M. Chen, "IS-IS Extensions
for Advertising Router Information", RFC 7981,
DOI 10.17487/RFC7981, October 2016,
<https://www.rfc-editor.org/info/rfc7981>.
[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>.
[RFC8362] Lindem, A., Roy, A., Goethals, D., Reddy Vallem, V., and
F. Baker, "OSPFv3 Link State Advertisement (LSA)
Extensibility", RFC 8362, DOI 10.17487/RFC8362, April
2018, <https://www.rfc-editor.org/info/rfc8362>.
[RFC9089] Xu, X., Kini, S., Psenak, P., Filsfils, C., Litkowski, S.,
and M. Bocci, "Signaling Entropy Label Capability and
Entropy Readable Label Depth Using OSPF", RFC 9089,
DOI 10.17487/RFC9089, August 2021,
<https://www.rfc-editor.org/info/rfc9089>.
Authors' Addresses
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Ran Chen
ZTE Corporation
Nanjing
China
Email: chen.ran@zte.com.cn
Detao Zhao
ZTE Corporation
Nanjing
China
Email: zhao.detao@zte.com.cn
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