Delay-Tolerant Networking E. Birrane
Internet-Draft E. DiPietro
Intended status: Experimental D. Linko
Expires: September 12, 2019 Johns Hopkins Applied Physics Laboratory
March 11, 2019
ION Licklider Transmission Protocol Admin Application Data Model
draft-birrane-dtn-adm-ion-ltpadmin-01
Abstract
This document describes the Application Data Model (ADM) for the
configuration of licklider transmission protocol (LTP) in ION in
compliance with the template provided by [I-D.birrane-dtn-adm].
Status of This Memo
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This Internet-Draft will expire on September 12, 2019.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Technical Notes . . . . . . . . . . . . . . . . . . . . . 2
1.2. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Structure and Design of this ADM . . . . . . . . . . . . . . 3
3. Naming and Identification . . . . . . . . . . . . . . . . . . 4
3.1. Namespace and Nicknames . . . . . . . . . . . . . . . . . 4
4. ION LTP Admin ADM JSON Encoding . . . . . . . . . . . . . . . 5
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.1. Informative References . . . . . . . . . . . . . . . . . 10
6.2. Normative References . . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction
An Application Data Model (ADM) provides a guaranteed interface for
the management of an application or protocol in accordance with the
Asynchronous Management Architecture (AMA) defined in
[I-D.birrane-dtn-ama]. The ADM described in this document complies
with the ADM Template provided in [I-D.birrane-dtn-adm] as encoded
using the JSON syntax.
The ION Licklider Transmission Protocol (LTP) Administration ADM
contains all of the functionality that is required to properly
configure LTP in ION in accordance with [RFC5326]. LTP is a
convergence layer protocol. There is no flow control or congestion
control in LTP. LTP must run either over UDP or directly over a link
layer protocol. Because of this, LTP cannot be used in every
situation. This LTP Admin ADM provides the set of information
necessary to provide retransmission based reliability on challenged
networks, focusing on the information that are needed to manage LTP
properly on the network.
1.1. Technical Notes
o This document describes Version 0.0 of the ION LTP Admin ADM.
o The AMM Resource Identifier (ARI) for this ADM is NOT correctly
set. A sample ARI is used in this version of the specification
and MAY change in future versions of this ADM until an ARI
registry is established. This notice will be removed at that
time.
o Agent applications MAY choose to ignore the name, description, or
other annotative information associated with the component
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definitions within this ADM where such items are only used to
provide human-readable information or are otherwise not necessary
to manage a device.
1.2. Scope
This ADM specifies those components of the Asynchronous Management
Model (AMM) common to the configuration of LTP in ION.
Any Manager software implementing this ADM MUST perform the
responsibilities of an AMA Manager as outlined in
[I-D.birrane-dtn-adm] as they relate to the objects included in this
document.
Any Agent software implementing this ADM MUST perform the
responsibilities of an AMA Agent as outlined in [I-D.birrane-dtn-adm]
as they relate to the objects included in this document.
1.3. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
2. Structure and Design of this ADM
The LTP Admin ADM's structure is in accordance to
[I-D.birrane-dtn-adm]. This ADM contains metadata, table templates,
and controls. Table Templates are column templates that will be
followed by any instance of this table available in the network.
They may not be created dynamically within the network by Managers.
Controls are predefined and sometimes parameterized opcodes that can
be run on an Agent. Controls are preconfigured in Agents and
Managers as part of ADM support.There are no variables, report
templates, macros, edd, constants, or operators in this ADM at this
time. The contents of this ADM are derived from the main functions
and data that are needed to manage LTP RFC 5326 [RFC5326].
All ADMs have metadata that includes the name, namespace, and version
of the ADM as well as the name of the organization that is issuing
that particular ADM. This is important for identification purposes
of the ADMs and to ensure version control.
The main idea identified in LTP that is present in this ADM is a span
of potential LTP data interchange between engines(nodes on a network
that use LTP).
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3. Naming and Identification
This section outlines the namespaces used to uniquely identify ADM
objects in this specification.
3.1. Namespace and Nicknames
In accordance with [I-D.birrane-dtn-adm], every ADM is assigned a
moderated Namespace. In accordance with [I-D.birrane-dtn-amp], these
namespaces may be enumerated for compactness. The namespace and ADM
identification for these objects is defined as follows.
+-----------------+------------------+
| Identifier | Value |
+-----------------+------------------+
| Namespace | DTN/ION/ltpadmin |
| | |
| ADM Enumeration | 9 |
+-----------------+------------------+
Table 1: Namespace Information
Given the above ADM enumeration, in accordance with
[I-D.birrane-dtn-amp], the following AMP nicknames are defined.
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+----------+------------------------------+
| Nickname | Collection |
+----------+------------------------------+
| 180 | DTN/ION/ltpadmin//Const |
| | |
| 181 | DTN/ION/ltpadmin//Ctrl |
| | |
| 182 | DTN/ION/ltpadmin//Edd |
| | |
| 183 | DTN/ION/ltpadmin//Mac |
| | |
| 184 | DTN/ION/ltpadmin//Oper |
| | |
| 185 | DTN/ION/ltpadmin//Rptt |
| | |
| 187 | DTN/ION/ltpadmin//Tblt |
| | |
| 189 | DTN/ION/ltpadmin//Var |
| | |
| 190 | DTN/ION/ltpadmin//Mdat |
| | |
| 191-199 | DTN/ION/ltpadmin//Reserved |
+----------+------------------------------+
Table 2: ION BP ADM Nicknames
4. ION LTP Admin ADM JSON Encoding
{
"Mdat": [{
"name": "name",
"type": "STR",
"value": "ion_ltp_admin",
"description": "The human-readable name of the ADM."
},
{
"name": "namespace",
"type": "STR",
"value": "DTN/ION/ltpadmin",
"description": "The namespace of the ADM."
},
{
"name": "version",
"type": "STR",
"value": "v0.0",
"description": "The version of the ADM."
},
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{
"name": "organization",
"type": "STR",
"value": "JHUAPL",
"description": "The name of the issuing organization of the
ADM."
}
],
"Edd": [{
"name": "ion_version",
"type": "STR",
"description": "This is the version of ION that is currently
installed."
}],
"Tblt": [{
"name": "spans",
"columns": [{
"type": "UVAST",
"name": "peer_engine_nbr"
}, {
"type": "UINT",
"name": "max_export_sessions"
}, {
"type": "UINT",
"name": "max_import_sessions"
}, {
"type": "UINT",
"name": "max_segment_size"
}, {
"type": "UINT",
"name": "aggregation_size_limit"
}, {
"type": "UINT",
"name": "aggregation_time_limit"
}, {
"type": "STR",
"name": "lso_control"
}, {
"type": "UINT",
"name": "queueing_latency"
}],
"description": "This table lists all spans of potential LTP data
interchange that exists between the local LTP
engine and the indicated (neighboring) LTP engine."
}],
"Ctrl": [{
"name": "manage_heap",
"parmspec": [{
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"type": "UINT",
"name": "max_database_heap_per_block"
}],
"description": "This control declares the maximum number of
bytes of SDR heap space that will be occupied by
the acquisition of any single LTP block. All
data acquired in excess of this limit will be
written to a temporary file pending extraction
and dispatching of the acquired block. Default
is the minimum allowed value (560 bytes), which
is the approximate size of a ZCO file reference
object; this is the minimum SDR heap space
occupancy in the event that all acquisition is
into a file."
},
{
"name": "manage_max_ber",
"parmspec": [{
"type": "REAL32",
"name": "max_expected_bit_error_rate"
}],
"description": "This control sets the expected maximum bit error
rate(BER) that LTP should provide for in
computing the maximum number of transmission
efforts to initiate in the transmission of a
given block.(Note that this computation is also
sensitive to data segment size and to the size
of the block that is to be transmitted.) The
default value is .0001 (10^-4)."
},
{
"name": "manage_own_queue_time",
"parmspec": [{
"type": "UINT",
"name": "own_queing_latency"
}],
"description": "This control sets the number of seconds of
predicted additional latency attributable to
processing delay within the local engine itself
that should be included whenever LTP computes
the nominal round-trip time for an exchange of
data with any remote engine.The default value
is 1."
},
{
"name": "manage_screening",
"parmspec": [{
"type": "UINT",
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"name": "new_state"
}],
"description": "This control enables or disables the screening
of received LTP segments per the periods of
scheduled reception in the node's contact graph.
By default, screening is disabled. When
screening is enabled, such segments are silently
discarded. Note that when screening is enabled
the ranges declared in the contact graph must
be accurate and clocks must be synchronized;
otherwise, segments will be arriving at times
other than the scheduled contact intervals and
will be discarded."
},
{
"name": "span_add",
"parmspec": [{
"type": "UVAST",
"name": "peer_engine_number"
}, {
"type": "UINT",
"name": "max_export_sessions"
}, {
"type": "UINT",
"name": "max_import_sessions"
}, {
"type": "UINT",
"name": "max_segment_size"
}, {
"type": "UINT",
"name": "aggregtion_size_limit"
}, {
"type": "UINT",
"name": "aggregation_time_limit"
}, {
"type": "STR",
"name": "lso_control"
}, {
"type": "UINT",
"name": "queuing_latency"
}],
"description": "This control declares that a span of potential
LTP data interchange exists between the local
LTP engine and the indicated (neighboring) LTP
engine."
},
{
"name": "span_change",
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"parmspec": [{
"type": "UVAST",
"name": "peer_engine_number"
}, {
"type": "UINT",
"name": "max_export_sessions"
}, {
"type": "UINT",
"name": "max_import_sessions"
}, {
"type": "UINT",
"name": "max_segment_size"
}, {
"type": "UINT",
"name": "aggregtion_size_limit"
}, {
"type": "UINT",
"name": "aggregation_time_limit"
}, {
"type": "STR",
"name": "lso_control"
}, {
"type": "UINT",
"name": "queuing_latency"
}],
"description": "This control sets the indicated span's
configuration parameters to the values provided
as arguments"
},
{
"name": "span_del",
"parmspec": [{
"type": "UVAST",
"name": "peer_engine_number"
}],
"description": "This control deletes the span identified by
peerEngineNumber. The control will fail if any
outbound segments for this span are pending
transmission or any inbound blocks from the
peer engine are incomplete."
},
{
"name": "stop",
"description": "This control stops all link service input and
output tasks for the local LTP engine."
},
{
"name": "watch_set",
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"parmspec": [{
"type": "STR",
"name": "activity"
}],
"description": "This control enables and disables production of
a continuous stream of user- selected LTP activity indication
characters. Activity parameter of 1 selects all LTP activity
indication characters; 0 de-selects all LTP activity indication
characters; any other activitySpec such as df{] selects all
activity indication characters in the string, de-selecting all
others. LTP will print each selected activity indication
character to stdout every time a processing event of the
associated type occurs: d bundle appended to block for next
session, e segment of block is queued for transmission, f
block has been fully segmented for transmission, g segment
popped from transmission queue, h positive ACK received for
block and session ended, s segment received, t block has been
fully received, @ negative ACK received for block and segments
retransmitted, = unacknowledged checkpoint was retransmitted,
+ unacknowledged report segment was retransmitted, { export
session canceled locally (by sender), } import session canceled
by remote sender, [ import session canceled locally (by
receiver), ] export session canceled by remote receiver"
}
]
}
5. IANA Considerations
At this time, this protocol has no fields registered by IANA.
6. References
6.1. Informative References
[I-D.birrane-dtn-ama]
Birrane, E., "Asynchronous Management Architecture",
draft-birrane-dtn-ama-07 (work in progress), June 2018.
6.2. Normative References
[I-D.birrane-dtn-adm]
Birrane, E., DiPietro, E., and D. Linko, "AMA Application
Data Model", draft-birrane-dtn-adm-02 (work in progress),
June 2018.
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[I-D.birrane-dtn-amp]
Birrane, E., "Asynchronous Management Protocol", draft-
birrane-dtn-amp-04 (work in progress), June 2018.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC5326] Ramadas, M., Burleigh, S., and S. Farrell, "Licklider
Transmission Protocol - Specification", RFC 5326,
DOI 10.17487/RFC5326, September 2008,
<https://www.rfc-editor.org/info/rfc5326>.
Authors' Addresses
Edward J. Birrane
Johns Hopkins Applied Physics Laboratory
Email: Edward.Birrane@jhuapl.edu
Evana DiPietro
Johns Hopkins Applied Physics Laboratory
Email: Evana.DiPietro@jhuapl.edu
David Linko
Johns Hopkins Applied Physics Laboratory
Email: David.Linko@jhuapl.edu
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