Internet DRAFT - draft-cheng-manet-dlep-latency-extension
draft-cheng-manet-dlep-latency-extension
Network Working Group B. Cheng
Internet-Draft Lincoln Laboratory
Intended status: Standards Track L. Berger, Ed.
Expires: April 30, 2017 LabN Consulting, L.L.C.
October 27, 2016
DLEP Lantency Range Extension
draft-cheng-manet-dlep-latency-extension-00
Abstract
This document defines an extension to the DLEP protocol to provide
the range of latency that may be experienced on a link.
Status of This Memo
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This Internet-Draft will expire on April 30, 2017.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Key Words . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Extension Usage and Identification . . . . . . . . . . . . . 2
3. Latency Range Data Items . . . . . . . . . . . . . . . . . . 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . 3
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
5.1. Extension Type Value . . . . . . . . . . . . . . . . . . 4
5.2. Data Item Value . . . . . . . . . . . . . . . . . . . . . 4
6. Normative References . . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
The Dynamic Link Event Protocol (DLEP) is defined in
[I-D.ietf-manet-dlep]. It provides the exchange of link related
control information between DLEP peers. DLEP peers are comprised of
a modem and a router. DLEP defines a base set of mechanisms as well
as support for possible extensions. This document defines one such
extension.
The base DLEP specification includes the Latency metric which
provides an average latency on a link. This document adds the
ability to relay the minimum and maximum latency range seen on a
link. The extension defined in this document is referred to as
"Latency Range".
This document defines a new DLEP Extension Type Value in Section 2
which is used to indicate the use of the extension, and one new DLEP
Data Items in Section 3.
1.1. Key Words
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14, RFC 2119 [RFC2119].
2. Extension Usage and Identification
The use of the Latency Range Extension SHOULD be configurable. To
indicate that the Latency Range Extension is to be used, an
implementation MUST include the Latency Range Extension Type Value in
the Extensions Supported Data Item. The Extensions Supported Data
Item is sent and processed according to [I-D.ietf-manet-dlep].
The Latency Range Extension Type Value is TBA1, see Section 5.
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3. Latency Range Data Items
The Latency Range Data Item serves much the same purpose as the
Latency Data Item defined in [I-D.ietf-manet-dlep] with the addition
of being able to communicate the latency range that may be
experienced by traffic on a link. The Latency Range Item MAY be
carried in the same messages and MUST be processed according to the
same rules as the Latency Range Data Item defined in
[I-D.ietf-manet-dlep].
The format of the Latency Range Data Item is:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Data Item Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Maximum Latency :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
: Maximum Latency |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Minimum Latency :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
: Minimum Latency |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Data Item Type: TBA2
Length: 16
Maximum Latency:
A 64-bit unsigned integer, representing the transmission longest
delay, in microseconds, that a packet encounters as it is
transmitted over the link.
Minimum Latency:
A 64-bit unsigned integer, representing the transmission shortest
delay, in microseconds, that a packet encounters as it is
transmitted over the link.
4. Security Considerations
The extension introduces a new mechanism for flow control between a
router and modem using the DLEP protocol. The extension does not
inherently introduce any additional threats above those documented in
[I-D.ietf-manet-dlep]. The approach taken to Security in that
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document applies equally when running the extension defined in this
document.
5. IANA Considerations
This document requests the assignment of 2 values by IANA. All
assignments are to registries defined by [I-D.ietf-manet-dlep].
5.1. Extension Type Value
This document requests one new assignment to the DLEP Extensions
Registry named "Extension Tyoe Values" in the range with the
"Specification Required" policy. The requested value is as follows:
+------+---------------+
| Code | Description |
+------+---------------+
| TBA1 | Latency Range |
+------+---------------+
Table 1: Requested Extension Type Value
5.2. Data Item Value
This document requests one new assignment to the DLEP Data Item
Registry named "Data Item Values" in the range with the
"Specification Required" policy. The requested values are as
follows:
+-----------+---------------+
| Type Code | Description |
+-----------+---------------+
| TBA2 | Latency Range |
+-----------+---------------+
Table 2: Requested Data Item Values
6. Normative References
[I-D.ietf-manet-dlep]
Ratliff, S., Jury, S., Satterwhite, D., Taylor, R., and (.
(Unknown), "Dynamic Link Exchange Protocol (DLEP)", draft-
ietf-manet-dlep-24 (work in progress), July 2016.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>.
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Authors' Addresses
Bow-Nan Cheng
Lincoln Laboratory
Massachusetts Institute of Technology
244 Wood Street
Lexington, MA 02420-9108
Email: bcheng@ll.mit.edu
Lou Berger (editor)
LabN Consulting, L.L.C.
Email: lberger@labn.net
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