BFD Multipoint Active Tails.
draft-ietf-bfd-multipoint-active-tail-09

Document Type Active Internet-Draft (bfd WG)
Last updated 2018-07-05 (latest revision 2018-06-18)
Replaces draft-spallagatti-bfd-multipoint-active-tail
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Internet Engineering Task Force                                  D. Katz
Internet-Draft                                          Juniper Networks
Updates: XXXX (RFC BFD for Multi-point                           D. Ward
         Networks) (if approved)                           Cisco Systems
Intended status: Standards Track                      S. Pallagatti, Ed.
Expires: December 20, 2018                        Individual Contributor
                                                          G. Mirsky, Ed.
                                                               ZTE Corp.
                                                           June 18, 2018

                      BFD Multipoint Active Tails.
                draft-ietf-bfd-multipoint-active-tail-09

Abstract

   This document describes active tail extensions to and updates the
   Bidirectional Forwarding Detection (BFD) protocol for multipoint
   networks.

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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   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 December 20, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

Katz, et al.            Expires December 20, 2018               [Page 1]
Internet-Draft         BFD Multipoint Active Tails             June 2018

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology and Acronyms  . . . . . . . . . . . . . . . . . .   3
   3.  Keywords  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Operational Scenarios . . . . . . . . . . . . . . . . . . . .   4
     5.1.  No Head Notification  . . . . . . . . . . . . . . . . . .   5
     5.2.  Head Notification . . . . . . . . . . . . . . . . . . . .   5
       5.2.1.  Head Notification Without Polling . . . . . . . . . .   5
       5.2.2.  Head Notification and Tail Solicitation with
               Multipoint Polling  . . . . . . . . . . . . . . . . .   6
       5.2.3.  Head Notification with Composite Polling  . . . . . .   6
   6.  Protocol Details  . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Multipoint Client Session . . . . . . . . . . . . . . . .   7
     6.2.  Multipoint Client Session Failure . . . . . . . . . . . .   8
     6.3.  State Variables . . . . . . . . . . . . . . . . . . . . .   8
       6.3.1.  New State Variables . . . . . . . . . . . . . . . . .   8
       6.3.2.  New State Variable Value  . . . . . . . . . . . . . .   9
       6.3.3.  State Variable Initialization and Maintenance . . . .   9
     6.4.  Controlling Multipoint BFD Options  . . . . . . . . . . .  10
     6.5.  State Machine . . . . . . . . . . . . . . . . . . . . . .  11
     6.6.  Session Establishment . . . . . . . . . . . . . . . . . .  11
     6.7.  Discriminators and Packet Demultiplexing  . . . . . . . .  11
     6.8.  Controlling Tail Packet Transmission  . . . . . . . . . .  12
     6.9.  Soliciting the Tails  . . . . . . . . . . . . . . . . . .  12
     6.10. Verifying Connectivity to Specific Tails  . . . . . . . .  13
     6.11. Detection Times . . . . . . . . . . . . . . . . . . . . .  14
     6.12. MultipointClient Down/AdminDown Sessions  . . . . . . . .  14
     6.13. Base BFD for Multipoint Networks Specification Text
           Replacement . . . . . . . . . . . . . . . . . . . . . . .  14
       6.13.1.  Reception of BFD Control Packets . . . . . . . . . .  15
       6.13.2.  Demultiplexing BFD Control Packets . . . . . . . . .  15
       6.13.3.  Transmitting BFD Control Packets . . . . . . . . . .  16
   7.  Assumptions . . . . . . . . . . . . . . . . . . . . . . . . .  16
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  17
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