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Implementing the Service Location Protocol
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Understanding Scope Filtering
SLP uses scopes to logically group services according to administration, usage, or service type
criteria. By dictating the scopes that SLP User Agents and Service Agents participate in, you can
control the service information users see. Unfortunately, that level of control is not sufficient for
large and sophisticated network environments. To give you better control over the collection and
distribution of service information, use the additional filtering capabilities provided as part of the
SLP Directory Agent configuration and management tools.
When administering scopes, you can configure registration, response, and directory filters for each
scope.
Registration filters restrict or control the service information that is accepted and stored by the
Directory Agent for a given scope
Response filters restrict or control the service information that is returned to specific users or
groups of users
Directory filters control whether the service information that is registered with the Directory
Agent (subject to the registration filters) is also stored in the corresponding Scope Unit
container object
The Registration, Response, and Directory filters are configured on a per-scope basis. This lets you
separately control the type of information stored in each scope.
Filtering
The SLP Directory Agent can be configured with service filters that control the service information
to and from SLP agents in the network. Additional filters can control the SLP service information
that is stored in the network directory for global distribution. These filters provide single-point
administration of the services made available through SLP (Windows NT/ 2000 Directory Agent
only).
Using INCLUDE and EXCLUDE Filters
Registration, response, and directory filters are specified using the INCLUDE and EXCLUDE filter
directives.
The INCLUDE filter directive specifies criteria that the service registration or request must comply
with to store or retrieve service information in the specified scope.
The EXCLUDE filter directive specifies criteria that prohibit any compliant service registration or
request from occurring for the specified scope.
The filters associated with a scope consist of one or more INCLUDE and EXCLUDE filter
directives. For a service registration or request to be processed, it must match at least one INCLUDE
filter directive and not match any EXCLUDE filter directives configured for the scope. If any
INCLUDE directives are configured, only service registrations and requests matching at least one
INCLUDE directive are processed; all others are denied. If no INCLUDE directives are configured,
all service registrations and requests are processed subject to any EXCLUDE filter directives.
The criteria for an INCLUDE or EXCLUDE filter directive are specified by one or more filter
operations. Filter operations allow the administrator to filter the type of service, the specific service
URLs, a service registration's lifetime, or the address of the sending or requesting host in the
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