draft-ietf-rtgwg-uloop-delay-08.txt   draft-ietf-rtgwg-uloop-delay-09.txt 
Routing Area Working Group S. Litkowski Routing Area Working Group S. Litkowski
Internet-Draft B. Decraene Internet-Draft B. Decraene
Intended status: Standards Track Orange Intended status: Standards Track Orange
Expires: April 15, 2018 C. Filsfils Expires: May 16, 2018 C. Filsfils
Cisco Systems Cisco Systems
P. Francois P. Francois
Individual Individual
October 12, 2017 November 12, 2017
Micro-loop prevention by introducing a local convergence delay Micro-loop prevention by introducing a local convergence delay
draft-ietf-rtgwg-uloop-delay-08 draft-ietf-rtgwg-uloop-delay-09
Abstract Abstract
This document describes a mechanism for link-state routing protocols This document describes a mechanism for link-state routing protocols
to prevent local transient forwarding loops in case of link failure. to prevent local transient forwarding loops in case of link failure.
This mechanism proposes a two-step convergence by introducing a delay This mechanism proposes a two-step convergence by introducing a delay
between the convergence of the node adjacent to the topology change between the convergence of the node adjacent to the topology change
and the network wide convergence. and the network wide convergence.
As this mechanism delays the IGP convergence it may only be used for As this mechanism delays the IGP convergence it may only be used for
skipping to change at page 2, line 10 skipping to change at page 2, line 10
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
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Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on April 15, 2018. This Internet-Draft will expire on May 16, 2018.
Copyright Notice Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
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publication of this document. Please review these documents publication of this document. Please review these documents
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described in [I-D.ietf-rtgwg-microloop-analysis]. described in [I-D.ietf-rtgwg-microloop-analysis].
5. Specification 5. Specification
5.1. Definitions 5.1. Definitions
This document will refer to the following existing IGP timers. These This document will refer to the following existing IGP timers. These
timers may be standardized or implemented as a vendor specific local timers may be standardized or implemented as a vendor specific local
feature. feature.
o LSP_GEN_TIMER: The delay used to batch multiple local events in o LSP_GEN_TIMER: The delay between two consecutives local LSP/LSA
one single local LSP/LSA update. In IS-IS, this timer is defined generation. From an operational point of view, this delay is
as minimumLSPGenerationInterval in [ISO10589]. In OSPF version 2, usually tuned to batch multiple local events in one single local
LSP/LSA update. In IS-IS, this timer is defined as
minimumLSPGenerationInterval in [ISO10589]. In OSPF version 2,
this timer is defined as MinLSInterval in [RFC2328]. It is often this timer is defined as MinLSInterval in [RFC2328]. It is often
associated with a vendor specific damping mechanism to slow down associated with a vendor specific damping mechanism to slow down
reactions by incrementing the timer when multiple consecutive reactions by incrementing the timer when multiple consecutive
events are detected. events are detected.
o SPF_DELAY: The delay between the first IGP event triggering a new o SPF_DELAY: The delay between the first IGP event triggering a new
routing table computation and the start of that routing table routing table computation and the start of that routing table
computation. It is often associated with a damping mechanism to computation. It is often associated with a damping mechanism to
slow down reactions by incrementing the timer when the IGP becomes slow down reactions by incrementing the timer when the IGP becomes
unstable. As an example, [I-D.ietf-rtgwg-backoff-algo] defines a unstable. As an example, [I-D.ietf-rtgwg-backoff-algo] defines a
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[RFC2328] Moy, J., "OSPF Version 2", STD 54, RFC 2328, [RFC2328] Moy, J., "OSPF Version 2", STD 54, RFC 2328,
DOI 10.17487/RFC2328, April 1998, DOI 10.17487/RFC2328, April 1998,
<https://www.rfc-editor.org/info/rfc2328>. <https://www.rfc-editor.org/info/rfc2328>.
15.2. Informative References 15.2. Informative References
[I-D.ietf-rtgwg-backoff-algo] [I-D.ietf-rtgwg-backoff-algo]
Decraene, B., Litkowski, S., Gredler, H., Lindem, A., Decraene, B., Litkowski, S., Gredler, H., Lindem, A.,
Francois, P., and C. Bowers, "SPF Back-off algorithm for Francois, P., and C. Bowers, "SPF Back-off algorithm for
link state IGPs", draft-ietf-rtgwg-backoff-algo-05 (work link state IGPs", draft-ietf-rtgwg-backoff-algo-06 (work
in progress), May 2017. in progress), October 2017.
[I-D.ietf-rtgwg-microloop-analysis] [I-D.ietf-rtgwg-microloop-analysis]
Zinin, A., "Analysis and Minimization of Microloops in Zinin, A., "Analysis and Minimization of Microloops in
Link-state Routing Protocols", draft-ietf-rtgwg-microloop- Link-state Routing Protocols", draft-ietf-rtgwg-microloop-
analysis-01 (work in progress), October 2005. analysis-01 (work in progress), October 2005.
[RFC3906] Shen, N. and H. Smit, "Calculating Interior Gateway [RFC3906] Shen, N. and H. Smit, "Calculating Interior Gateway
Protocol (IGP) Routes Over Traffic Engineering Tunnels", Protocol (IGP) Routes Over Traffic Engineering Tunnels",
RFC 3906, DOI 10.17487/RFC3906, October 2004, RFC 3906, DOI 10.17487/RFC3906, October 2004,
<https://www.rfc-editor.org/info/rfc3906>. <https://www.rfc-editor.org/info/rfc3906>.
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