Internet-Draft MNA NFFRR October 2022
Beeram, et al. Expires 24 April 2023 [Page]
Workgroup:
MPLS Working Group
Internet-Draft:
draft-li-mpls-mna-nffrr-00
Published:
Intended Status:
Informational
Expires:
Authors:
V. P. Beeram
Juniper Networks
T. Saad
Cisco Systems
I. Meilik
Broadcom
T. Li
Juniper Networks
J. Drake
Juniper Networks

MPLS Network Actions for No Further Fast Reroute

Abstract

Protection switching for MPLS traffic was first introduced in "Fast Reroute Extensions to RSVP-TE for LSP Tunnels". Since then, Fast Reroute (FRR) has been successfully used in many MPLS networks to help ensure high availability in the face of failures.

If there are multiple failures in a network, there are circumstances where FRR, if applied multiple times, can result in sub-optimal behavior, such as forwarding loops. Thus, it is useful to indicate in the forwarding plane that the attached traffic should not be subjected to further FRR redirection.

This document describes a network action for identifying such traffic to be used in conjunction with "MPLS Network Action (MNA) Header Encodings".

Status of This Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at https://datatracker.ietf.org/drafts/current/.

Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress."

This Internet-Draft will expire on 24 April 2023.

Table of Contents

1. Introduction

Protection switching for MPLS traffic was first introduced in [RFC4090]. Since then, Fast Reroute (FRR) has been successfully used in many MPLS networks to help ensure high availability in the face of failures.

If there are multiple failures in a network, there are circumstances where FRR, if applied multiple times, can result in sub-optimal behavior, such as forwarding loops. [I-D.kompella-mpls-nffrr] Thus, it is useful to indicate in the forwarding plane that the attached traffic should not be subjected to further FRR redirection.

This document describes a network actions for identifying such traffic to be used in conjunction with "MPLS Network Action (MNA) Header Encodings" [I-D.jags-mpls-mna-hdr] as part of the MPLS Network Action architecture. [I-D.ietf-mpls-miad-mna-requirements] [I-D.ietf-mpls-mna-fwk]

1.1. Requirement 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.

2. The No Further Fast Reroute (NFFRR) Action

Packets that indicate the NFFRR action should not be subject to further FRR operations.

3. Security Considerations

The forwarding plane is insecure. If an adversary can affect the forwarding plane, then they can inject data, remove data, corrupt data, or modify data. MNA additionally allows an adversary to make packets perform arbitrary network actions.

Link-level security mechanisms can help mitigate some on-link attacks, but does nothing to preclude hostile nodes.

4. IANA Considerations

This document requests that IANA allocate a bit position (TBA1) from the MPLS "In-Stack MPLS Network Action Indicator Flags" registry for the No Further Fast Reroute Action. The allocation should reference this document.

5. Normative References

[I-D.ietf-mpls-miad-mna-requirements]
Bocci, M. and S. Bryant, "Requirements for MPLS Network Action Indicators and MPLS Ancillary Data", Work in Progress, Internet-Draft, draft-ietf-mpls-miad-mna-requirements-00, , <https://www.ietf.org/archive/id/draft-ietf-mpls-miad-mna-requirements-00.txt>.
[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-01, , <https://www.ietf.org/archive/id/draft-ietf-mpls-mna-fwk-01.txt>.
[I-D.jags-mpls-mna-hdr]
Rajamanickam, J., Gandhi, R., Zigler, R., Song, H., and K. Kompella, "MPLS Network Action (MNA) Header Encodings", Work in Progress, Internet-Draft, draft-jags-mpls-mna-hdr-02, , <https://www.ietf.org/archive/id/draft-jags-mpls-mna-hdr-02.txt>.
[I-D.kompella-mpls-nffrr]
Kompella, K. and W. Lin, "No Further Fast Reroute", Work in Progress, Internet-Draft, draft-kompella-mpls-nffrr-03, , <https://www.ietf.org/archive/id/draft-kompella-mpls-nffrr-03.txt>.
[RFC2119]
Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, , <https://www.rfc-editor.org/info/rfc2119>.
[RFC4090]
Pan, P., Ed., Swallow, G., Ed., and A. Atlas, Ed., "Fast Reroute Extensions to RSVP-TE for LSP Tunnels", RFC 4090, DOI 10.17487/RFC4090, , <https://www.rfc-editor.org/info/rfc4090>.
[RFC8174]
Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, , <https://www.rfc-editor.org/info/rfc8174>.

Authors' Addresses

Vishnu Pavan Beeram
Juniper Networks
1133 Innovation Way
Sunnyvale, CA 94089
United States
Tarek Saad
Cisco Systems
Israel Meilik
Broadcom
Tony Li
Juniper Networks
John Drake
Juniper Networks