IPP> DIR/SLP - Simple Service Discovery Protocol/1.0

IPP> DIR/SLP - Simple Service Discovery Protocol/1.0

IPP> DIR/SLP - Simple Service Discovery Protocol/1.0

Hastings, Tom N hastings at cp10.es.xerox.com
Mon May 3 04:53:45 EDT 1999

Here is the beginning of a proposed Internet standard submitted by Microsoft
and HP for a simple service discovery protocol.  I've abstracted up to
section 1 of it.  The rest can be found in the Internet-Drafts directory.  I
suspect that this is a competitor for
SLP, correct?  How do the two compare?


Internet Engineering Task Force                               Ting Cai
INTERNET DRAFT                                              Paul Leach
                                                                 Ye Gu
                                                       Yaron Y. Goland
                                                 Microsoft Corporation
                                                      Shivaun Albright
                                               Hewlett-Packard Company
                                                         April 8, 1999
                                                Expires September 1999

                 Simple Service Discovery Protocol/1.0

Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   This document is an Internet-Draft. Internet-Drafts are working
   documents of the Internet Engineering Task Force (IETF), its areas,
   and its working groups.  Note that other groups may also distribute
   working documents as Internet-Drafts.

   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."

   The list of current Internet-Drafts can be accessed at

   The list of Internet-Draft Shadow Directories can be accessed at


   The Simple Service Discovery Protocol (SSDP) provides a mechanism
   where by network clients, with little or no static configuration,
   can discover desired network services. SSDP uses HTTP over multicast
   and unicast UDP to provide two functions: OPTIONS and ANNOUNCE.
   OPTIONS is used to determine if a desired network service exists on
   the network. ANNOUNCE is used by network services to announce their

1.   Introduction

   With the growing number of small peer-to-peer TCP/IP networks, such
   as home or small office networks, computer users need a way to
   discover resources in a network easily, quickly, dynamically, and
   without any a priori knowledge.  This document proposes a discovery
   protocol that meets this user requirement.
INTERNET-DRAFT                 SSDP/V1                   April 8, 1999

   The proposed protocol is called the Simple Service Discovery
   Protocol (or SSDP).  SSDP performs only discovery.  It leaves any
   additional service description and/or negotiation to a higher layer
   service-specific protocol.

   Using SSDP, operating systems and applications can discover SSDP-
   enabled services in a network dynamically by issuing service
   queries.  Services that match the queries respond with their network
   locations and protocols to be used to communicate with them.  In
   addition, services can make their presence known through unsolicited

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