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state machine
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... application-layer acknowledgements, and defines failover
algorithms and the associated state machine. This is described in
Section 5.5 and [AAATRANS].
...
... accounting application should be viewed as a
last resort and MUST NOT be used unless a new command or additional
mechanisms (e.g., application defined state machine) is defined
within the application, or new mandatory AVPs are added to the ABNF ...
... accounting is used without any mandatory AVPs, new
commands or additional mechanisms (e.g., application defined state
machine), then the base protocol defined standard accounting
...
... port 3868. A given
Diameter instance of the peer state machine MUST NOT use more than
one transport connection to communicate with a given peer, unless
...
... transport connection, they MUST
exchange the Capabilities Exchange messages, as specified in the peer
state machine (see Section 5.6). This message allows the discovery
of a peer's identity and its capabilities (protocol version number ...
... Peer State Machine ...
...
This section contains a finite state machine that MUST be observed by
all Diameter implementations. Each Diameter node ...
... Diameter implementations. Each Diameter node MUST follow the
state machine described below when communicating with each peer.
Multiple actions are separated by commas, and may continue on
succeeding lines, as space requires. Similarly, state ...
... may also span multiple lines, as space requires.
This state machine is closely coupled with the state machine
described in [AAATRANS ...
...
This state machine is closely coupled with the state machine
described in [AAATRANS], which is used to open, close, failover,
...
... connection on which the event occurred.
The stable states that a state machine may be in are Closed, I-Open
and R-Open; all other states are intermediate. Note that I-Open and
R-Open are equivalent except for whether the initiator ...
... state.
The state machine constrains only the behavior of a Diameter
implementation as seen by Diameter ...
... For this reason, a Diameter peer must employ logic separate from the
state machine to receive connection requests, accept them, and await
CER ...
... connection, the Origin-Host that
identifies the peer is used to locate the state machine associated
with that peer, and the new connection and CER ...
... incoming connections up to and including receipt
of CER requires logic, separate from that of any individual state
machine associated with a particular peer, it is described separately
in this section rather than in the state machine above.
...
... CER requires logic, separate from that of any individual state
machine associated with a particular peer, it is described separately
in this section rather than in the state machine above.
...
...
This section contains a set of finite state machines, representing
the life cycle of Diameter sessions ...
... There are four different authorization session state machines
supported in the Diameter base protocol ...
... session from a client perspective, the other from a
server perspective. The second two state machines are used when the
server does not maintain session state ...
... allocated for the particular session must be released. Any event not
listed in the state machines MUST be considered as an error
condition, and an answer, if applicable, MUST be returned to the
originator of the message.
...
... successfully sent' is the complement of 'Failure to send X'.
The following state machine is observed by a client when state is
...
... user/device
The following state machine is observed by a server when it is
maintaining state for the session ...
... user/device
The following state machine is observed by a server when it is not
maintaining state for the session ...
...
The following state machines MUST be supported for applications that
have an accounting portion or that require only accounting ...
... The server side in the accounting state machine depends in some cases
on the particular application. The Diameter base protocol ...
... Diameter base protocol defines a
default state machine that MUST be followed by all applications that
have not specified other state machines. This is the second state
machine ...
... default state machine that MUST be followed by all applications that
have not specified other state machines. This is the second state
machine in this section described below.
...
... state machine that MUST be followed by all applications that
have not specified other state machines. This is the second state
machine in this section described below.
The default server side ...
...
The default server side state machine requires the reception of
accounting records in any order and at any time, and does not place
...
... base protocol defines one optional server side
state machine that MAY be followed by applications that require
keeping track of the session state ...
... accounting server. Note
that such tracking is incompatible with the ability to sustain long
duration connectivity problems. Therefore, the use of this state
machine is recommended only in applications where the value of the
Accounting-Realtime-Required AVP ...
... may be lost by the server which no longer accepts them after the
connectivity is re-established. This state machine is the third
state machine in this section. The state machine ...
... connectivity is re-established. This state machine is the third
state machine in this section. The state machine is supervised by a
supervision session ...
... state machine is the third
state machine in this section. The state machine is supervised by a
supervision session timer ...
... network failure.
Any event not listed in the state machines MUST be considered as an
error condition, and a corresponding answer, if applicable, MUST be
...
...
Paul Funk and David Mitton were instrumental in getting the Peer
State Machine correct, and our deep thanks go to them for their time.
Text in this document was also provided by Paul Funk, Mark Eklund,
...