RFC 2872 (rfc2872) - Page 2 of 6
Application and Sub Application Identity Policy Element for Use with RSVP
Alternative Format: Original Text Document
RFC 2872 Application Identifiers for RSVP June 2000
One type of policy information describes the application on behalf of
which an RSVP signaling request is generated. When application policy
information is available, network administrators are able to manage
QoS based on application type. So, for example, a network
administrator may establish a policy that prioritizes known mission-
critical applications over games.
This memo describes a structure for a policy element that can be used
to identify application traffic flows. The policy element includes a
number of attributes, one of which is a policy locator. This policy
locator includes the following hierarchically ordered sub-elements
(in descending levels of hierarchy):
1. identifier that uniquely identifies the application vendor
2. identifier of the application
3. version number of the application
4. sub-application identifier
An arbitrary number of sub-application identifiers may be included in
the policy locator. An example of such an identifier is 'print
transaction'.
This memo specifies the structure of the application policy element
and proposes keywords for the sub-elements at each level of the
hierarchy. It does not enumerate specific values for the sub-
elements: such an enumeration is beyond the scope of this memo.
2. Simple Application Identity Policy Element Structure
General application identity policy elements are defined in
[RFC 2752]. These are policy elements with a P-type of AUTH_APP.
Following the policy element header is a list of authentication
attributes.
The first authentication attribute is of the A-type POLICY_LOCATOR.
The sub-type of the POLICY_LOCATOR attribute is of type ASCII_DN
[RFC 1779] or UNICODE_DN. The actual attribute data is formatted as an
X.500 distinguished name (DN), representing a globally unique
identifier, the application, version number and sub-application in a
hierarchical structure. The POLICY_LOCATOR attribute contains
keywords as described in section 2. For further details on the format
of the POLICY_LOCATOR attribute, see [RFC 2752].
The second authentication attribute is of the A-type CREDENTIAL. The
sub-type of the CREDENTIAL attribute is of type ASCII_ID or
UNICODE_ID. The actual attribute data is an ASCII or Unicode string
representing the application name. This structure is illustrated in
the following diagram:
Bernet & Pabbati Standards Track