Multicast DNS Discovery Relay
draft-sctl-dnssd-mdns-relay-00
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Network Working Group S. Cheshire
Internet-Draft Apple Inc.
Intended status: Standards Track T. Lemon
Expires: January 4, 2018 Nominum, Inc.
July 3, 2017
Multicast DNS Discovery Relay
draft-sctl-dnssd-mdns-relay-00
Abstract
This document extends the Discovery Proxy for Multicast DNS-Based
Service Discovery specification. It describes a lightweight relay
mechanism, a Discovery Relay, which allows Discovery Proxies to
provide service on links to which the hosts on which they are running
are not directly attached.
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 http://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 January 4, 2018.
Copyright Notice
Copyright (c) 2017 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
(http://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
include Simplified BSD License text as described in Section 4.e of
Cheshire & Lemon Expires January 4, 2018 [Page 1]
Internet-Draft mDNS Discovery Relay July 2017
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Protocol Overview . . . . . . . . . . . . . . . . . . . . . . 5
3.1. Connections between Discovery and Discovery Relays . . . 5
3.2. mDNS Messages On Links . . . . . . . . . . . . . . . . . 6
4. Orchestration . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1. Orchestration System Functional Overview . . . . . . . . 7
4.2. Orchestration Primitives . . . . . . . . . . . . . . . . 7
4.2.1. Link Present . . . . . . . . . . . . . . . . . . . . 7
4.2.2. Link Remove . . . . . . . . . . . . . . . . . . . . . 8
4.2.3. Discovery Proxy Available . . . . . . . . . . . . . . 8
4.2.4. Discovery Proxy Resigning . . . . . . . . . . . . . . 8
4.2.5. Discovery Relay Available . . . . . . . . . . . . . . 9
4.2.6. Discovery Relay Resigning . . . . . . . . . . . . . . 9
4.3. Orchestration System Behavior . . . . . . . . . . . . . . 10
4.3.1. Link Present . . . . . . . . . . . . . . . . . . . . 10
4.3.2. Link Remove . . . . . . . . . . . . . . . . . . . . . 10
4.3.3. Discovery Proxy Available . . . . . . . . . . . . . . 10
4.3.4. Discovery Proxy Resigning . . . . . . . . . . . . . . 11
4.3.5. Discovery Relay Available . . . . . . . . . . . . . . 11
4.3.6. Discovery Relay Resigning . . . . . . . . . . . . . . 12
4.3.7. Node Available . . . . . . . . . . . . . . . . . . . 12
4.3.8. Node Resigning . . . . . . . . . . . . . . . . . . . 12
4.4. Discovery Proxy Performer Behavior . . . . . . . . . . . 12
4.4.1. Link Present . . . . . . . . . . . . . . . . . . . . 13
4.4.2. Link Removed . . . . . . . . . . . . . . . . . . . . 13
4.4.3. Discovery Proxy Available . . . . . . . . . . . . . . 13
4.4.4. Discovery Proxy Resigning . . . . . . . . . . . . . . 14
4.4.5. Discovery Relay Available . . . . . . . . . . . . . . 14
4.4.6. Discovery Relay Resigning . . . . . . . . . . . . . . 15
4.5. Discovery Relay Performer Behavior . . . . . . . . . . . 15
4.5.1. Link Present . . . . . . . . . . . . . . . . . . . . 15
4.5.2. Link Removed . . . . . . . . . . . . . . . . . . . . 15
4.5.3. Discovery Proxy Available . . . . . . . . . . . . . . 15
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