DNS Reverse IP AMT Discovery
draft-ietf-mboned-driad-amt-discovery-00

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Last updated 2019-01-25
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Mboned                                                        J. Holland
Internet-Draft                                 Akamai Technologies, Inc.
Updates: 7450 (if approved)                             January 25, 2019
Intended status: Standards Track
Expires: July 29, 2019

                      DNS Reverse IP AMT Discovery
                draft-ietf-mboned-driad-amt-discovery-00

Abstract

   This document updates RFC 7450 (AMT) by extending the relay discovery
   process to use a new DNS resource record for source-specific AMT
   relay discovery when joining source-specific multicast channels.  A
   multicast sender configures a reverse IP DNS zone with the new
   AMTRELAY RR (defined in this document) to advertise a set of relays
   that can receive and forward multicast traffic from that sender
   inside a unicast AMT tunnel, in order to transit non-multicast-
   capable network segments.

Status of This Memo

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   This Internet-Draft will expire on July 29, 2019.

Copyright Notice

   Copyright (c) 2019 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
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   carefully, as they describe your rights and restrictions with respect

Holland                   Expires July 29, 2019                 [Page 1]
Internet-Draft                    DRIAD                     January 2019

   to this document.  Code Components extracted from this document must
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Background  . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
       1.2.1.  Relays and Gateways . . . . . . . . . . . . . . . . .   4
       1.2.2.  Definitions . . . . . . . . . . . . . . . . . . . . .   4
   2.  Relay Discovery Operation . . . . . . . . . . . . . . . . . .   5
     2.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Signaling and Discovery . . . . . . . . . . . . . . . . .   6
     2.3.  Optimal Relay Selection . . . . . . . . . . . . . . . . .   8
     2.4.  Guidelines for Restarting Discovery . . . . . . . . . . .   9
       2.4.1.  Overview  . . . . . . . . . . . . . . . . . . . . . .   9
       2.4.2.  Tunnel Stability  . . . . . . . . . . . . . . . . . .  11
       2.4.3.  Flow Health . . . . . . . . . . . . . . . . . . . . .  11
       2.4.4.  Relay Loading and Shutdown  . . . . . . . . . . . . .  11
       2.4.5.  Relay Discovery Messages vs. Restarting Discovery . .  12
       2.4.6.  Connecting to Multiple Relays . . . . . . . . . . . .  13
     2.5.  DNS Configuration . . . . . . . . . . . . . . . . . . . .  13
     2.6.  Waiting for DNS resolution  . . . . . . . . . . . . . . .  13
   3.  Example Deployments . . . . . . . . . . . . . . . . . . . . .  14
     3.1.  Example Receiving Networks  . . . . . . . . . . . . . . .  14
       3.1.1.  Tier 3 ISP  . . . . . . . . . . . . . . . . . . . . .  14
       3.1.2.  Small Office  . . . . . . . . . . . . . . . . . . . .  15
     3.2.  Example Sending Networks  . . . . . . . . . . . . . . . .  18
       3.2.1.  Sender-controlled Relays  . . . . . . . . . . . . . .  18
       3.2.2.  Provider-controlled Relays  . . . . . . . . . . . . .  19
   4.  AMTRELAY Resource Record Definition . . . . . . . . . . . . .  20
     4.1.  AMTRELAY RRType . . . . . . . . . . . . . . . . . . . . .  20
     4.2.  AMTRELAY RData Format . . . . . . . . . . . . . . . . . .  20
       4.2.1.  RData Format - Precedence . . . . . . . . . . . . . .  21
       4.2.2.  RData Format - Discovery Optional (D-bit) . . . . . .  21
       4.2.3.  RData Format - Type . . . . . . . . . . . . . . . . .  22
       4.2.4.  RData Format - Relay  . . . . . . . . . . . . . . . .  22
     4.3.  AMTRELAY Record Presentation Format . . . . . . . . . . .  22
       4.3.1.  Representation of AMTRELAY RRs  . . . . . . . . . . .  22
       4.3.2.  Examples  . . . . . . . . . . . . . . . . . . . . . .  23
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