< draft-ietf-lsr-isis-rfc5306bis-00.txt   draft-ietf-lsr-isis-rfc5306bis-01.txt >
IS-IS for IP Internets L. Ginsberg IS-IS for IP Internets L. Ginsberg
Internet-Draft P. Wells Internet-Draft P. Wells
Obsoletes: 5306 (if approved) Cisco Systems, Inc. Obsoletes: 5306 (if approved) Cisco Systems, Inc.
Intended status: Standards Track October 01, 2018 Intended status: Standards Track December 13, 2018
Expires: April 4, 2019 Expires: June 16, 2019
Restart Signaling for IS-IS Restart Signaling for IS-IS
draft-ietf-lsr-isis-rfc5306bis-00 draft-ietf-lsr-isis-rfc5306bis-01
Abstract Abstract
This document describes a mechanism for a restarting router to signal This document describes a mechanism for a restarting router to signal
to its neighbors that it is restarting, allowing them to reestablish to its neighbors that it is restarting, allowing them to reestablish
their adjacencies without cycling through the down state, while still their adjacencies without cycling through the down state, while still
correctly initiating database synchronization. correctly initiating database synchronization.
This document additionally describes a mechansim for a router to This document additionally describes a mechansim for a router to
signal its neighbors that it is preparing to initiate a restart while signal its neighbors that it is preparing to initiate a restart while
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
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 4, 2019. This Internet-Draft will expire on June 16, 2019.
Copyright Notice Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the Copyright (c) 2018 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
(https://trustee.ietf.org/license-info) in effect on the date of (https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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is in the UP state and subsequently goes DOWN, the event MAY be is in the UP state and subsequently goes DOWN, the event MAY be
ignored since it is possible this is an expected side effect of ignored since it is possible this is an expected side effect of
the restart. Use of the Control Plane Independent state as the restart. Use of the Control Plane Independent state as
signalled in BFD control packets [RFC5880] SHOULD be considered signalled in BFD control packets [RFC5880] SHOULD be considered
in the decision to ignore a BFD Session DOWN event in the decision to ignore a BFD Session DOWN event
c. On a Point-to-Point circuit, transmission of LSPs, CSNPs, and c. On a Point-to-Point circuit, transmission of LSPs, CSNPs, and
PSNPs MAY be suppressed. It is expected that the PDUs will not PSNPs MAY be suppressed. It is expected that the PDUs will not
be received. be received.
Use of the PR bit provides a means to safely support restart periods
which are significantly longer than standard holdtimes.
2.3. Adjacency (Re)Acquisition 2.3. Adjacency (Re)Acquisition
Adjacency (re)acquisition is the first step in (re)initialization. Adjacency (re)acquisition is the first step in (re)initialization.
Restarting and starting routers will make use of the RR bit in the Restarting and starting routers will make use of the RR bit in the
restart TLV, though each will use it at different stages of the restart TLV, though each will use it at different stages of the
(re)start procedure. (re)start procedure.
2.3.1. Adjacency Reacquisition during Restart 2.3.1. Adjacency Reacquisition during Restart
The restarting router explicitly notifies its neighbor that the The restarting router explicitly notifies its neighbor that the
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