Siemens C10 Betriebsanweisung Seite 190

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DHCP, SLP, and Option 78 reference
A31003-W1010-A100-1-7619, July 2005
188 HiPath Wireless Controller, Access Points and Convergence Software V3.0: User Guide
HWC_AppendixC.fm
Service Location Protocol (SLP) (RFC2608)
C.1 Service Location Protocol (SLP) (RFC2608)
Service Location Protocol (RFC2608) is a method of organizing and locating the resources
(such as printers, disk drives, databases, e-mail directories, and schedulers) in a network.
Using SLP, networking applications can discover the existence, location and configuration of
networked devices.
In larger installations, services will register their services with one or more Directory Agents,
and clients will contact the Directory Agent to fulfill requests for Service Location information.
Service Location Protocol consists of three cooperating services:
User Agent (UA): A process working on the user's behalf to acquire service attributes and
configuration. The User Agent retrieves service information from the Service Agents or
Directory Agents.
Service Agent (SA): A process working on the behalf of one or more services to advertise
service attributes and configuration.
Directory Agent (DA): A process which collects information from Service Agents to provide
a single repository of service information in order to centralize it for efficient access by User
Agents. There can only be one DA present per given host.
When a service starts on the network, its Service Agent will query the DHCP server for Option
78 and 79 and will register itself appropriately.
C.2 DHCP Options for Service Location Protocol (RFC2610)
The Dynamic Host Configuration Protocol (RFC2131) provides a framework for passing
configuration information to hosts on a TCP/IP network.
Entities using the Service Location Protocol, Version 2 (RFC2608) and Service Location
Protocol, Version 1 (RFC2165) need to obtain the address of Directory Agents in order to
transact messages. The SLP Directory Agent option described below (Option 78) is used to
configure User Agents and Service Agents with the location of Directory Agents in the network.
The SLP Scope Option (Option 79) provides an assignment of scope for configuration of SLP
User and Service Agents. This option takes precedence over both default and static scope
configuration of SLP agents. A scope is a set of services, typically making up a logical
administrative group.
C.3 SLP Directory Agent Option (Option 78)
The SLP Directory Agent Option 78 specifies a list of IP addresses for SLP Directory Agents.
Directory Agents should be listed in order of preference.
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