Internet DRAFT - draft-gundavelli-dmm-lma-controlled-mag-params
draft-gundavelli-dmm-lma-controlled-mag-params
IPSECME WG D. Patki
Internet-Draft S. Gundavelli
Intended status: Standards Track Cisco
Expires: April 14, 2016 J. Lee
Sangmyung University
Q. Fu
China Mobile
L. Bertz
Sprint
October 12, 2015
LMA Controlled MAG Session Parameters
draft-gundavelli-dmm-lma-controlled-mag-params-00.txt
Abstract
This specification defines a new extension, LMA-Controlled-MAG-
Session-Params to Proxy Mobile IPv6. This option can be used by the
LMA in PMIPv6 signaling for notifying the MAG to conform to various
parameters contained in this extension.
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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This Internet-Draft will expire on April 14, 2016.
Copyright Notice
Copyright (c) 2015 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions and Terminology . . . . . . . . . . . . . . . . . 3
2.1. Conventions . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
3. Protocol Extension . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Format of the LCMP Sub-Options . . . . . . . . . . . . . . 4
3.1.1. Binding Re-registration Control Sub-Option . . . . . . 5
3.1.2. Heartbeat Control Sub-Option . . . . . . . . . . . . . 6
4. Protocol Configuration Variables . . . . . . . . . . . . . . . 6
4.1. Local Mobility Anchor - Configuration Variables . . . . . 7
5. Protocol Considerations . . . . . . . . . . . . . . . . . . . 8
5.1. Local Mobility Anchor Considerations . . . . . . . . . . . 9
5.2. Mobile Access Gateway Considerations . . . . . . . . . . . 10
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
7. Security Considerations . . . . . . . . . . . . . . . . . . . 11
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8.1. Normative References . . . . . . . . . . . . . . . . . . . 11
8.2. Informative References . . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12
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1. Introduction
A large PMIPv6 deployment, such as residential deployment, can have
tens of thousands of MAGs spread across geographical locations.
While it can be operationally challenging to manage such large number
of MAGs, it can also be very difficult to ensure configuration
consistency across all the MAGs if they are not centrally managed.
Configuring aggresive values of parameters such as re-registration
timeout and heartbeat interval can potentially create considerable
signaling load on the LMA. This document provides a new option to
enable the LMA to control various parameters on the MAG such as the
re-registration frequency [RFC5213] and heartbeat frequency
[RFC5847]. With this option, the configuration of these tunable
parameters done centrally on the LMA enables Service Providers to
have better control on the behavior of the MAGs with deterministic
singaling load on the LMA.
2. Conventions and Terminology
2.1. Conventions
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 [RFC2119].
2.2. Terminology
All the terms used in this document are to be interpreted as defined
in [RFC5213], [RFC5847] and [RFC7563].
3. Protocol Extension
The LMA Controlled MAG Parameters (LCMP) option is a mobility header
option used to exchange information related to the parameters that a
local mobility anchor enforces on a mobile access gateway. The
option can be included in Proxy Binding Acknowledgement (PBA) message
only, and there MUST NOT be more than a single instance of this
mobility option in a mobility message. This mobility option MUST
contain one or more LMA Controlled MAG Parameters sub-options. The
suboptions are defined in Section 3.1. The alignment requirement for
this option is 4n [RFC2460].
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... LCMP Sub-option(s) ... ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: LMA Controlled MAG Parameters Option
Type
MUST be set to the value of IANA-1, indicating that it is a LMA-
Controlled-MAG-Parameters option.
Length
8-bit unsigned integer indicating the length in octets of the
option, excluding the Type and Length fields.
Reserved
MUST be set to zero when sending and ignored when received.
3.1. Format of the LCMP Sub-Options
The LMA Controlled MAG Parameters sub-options are used for carrying
information elements related to various parameters that need to be
configured on the MAG. These sub-options can be included in the LMA
Controlled MAG Parameters option defined in Section 3. The format of
this sub-option is as follows. The alignment requirement for the
sub-option is 4n. The sub-options are optional and can be present in
any order.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| LCMP Type | LCMP Length | Sub-Option Data ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: LMA Controlled MAG Parameters Sub-Option
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Type
8-bit unsigned integer indicating the type of the LMA Controlled
MAG Parameters sub-option. This specification defines the
following types:
0 - Reserved
1 - Binding Refresh Control Sub-Option
2 - Heartbeat Control Sub-Option
Length
8-bit unsigned integer indicating the number of octets needed to
encode the Option Data, excluding the LCMP Type and LCMP Length
fields of the sub-option.
3.1.1. Binding Re-registration Control Sub-Option
The Binding Re-registration Control Sub-Option is a mobility sub-
option carried in the LMA Controlled MAG Parameters mobility option
defined in Section 3.1. This sub-option carries re-registration
related timer values. There MUST be no more than a single instance
of this sub-option in LMA Controlled MAG Parameters option. The
format of this sub-option is defined below.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| LCMP Type = 1 | LCMP Length | Re-registration-Start-Time |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Initial-Retransmission-Time | Maximum-Retransmission-Time |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 3: Binding Re-registration Control Sub-Option
Re-registration-Start-Time
16-bit unsigned integer indicating the number of time units before
the expiry of the PMIPv6 binding lifetime when the registration
refresh process needs to be activated. One time unit is 4
seconds.
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Initial-Retransmission-Time
16-bit unsigned integer indicating minimum delay in seconds before
the first PBU retransmission of the exponential back-off process.
Maximum-Retransmission-Time
16-bit unsigned integer indicating maximum delay in seconds before
the last PBU retransmission message of the exponential back-off
process.
3.1.2. Heartbeat Control Sub-Option
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| LCMP Type = 2 | LCMP Length | HB-Interval |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| HB-Retransmission-Delay | HB-Max-Retransmissions |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 4: Heartbeat Control Sub-Option
HB-Interval
16-bit unsigned integer indicating heartbeat interval, i.e. time
delay in seconds after a successful heartbeat exchange (request
followed by response) when the next heartbeat exchange can be
triggered.
HB-Retransmission-Delay
16-bit unsigned integer indicating minimum time delay in seconds
before a heartbeat message is retransmitted.
HB-Max-Retransmissions
16-bit unsigned integer indicating maximum number of heartbeat
retransmissions.
4. Protocol Configuration Variables
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4.1. Local Mobility Anchor - Configuration Variables
The local mobility anchor MUST allow the following variables to be
configured by the system management. The configured values for these
protocol variables MUST survive server reboots and service restarts.
EnableLCMPSubOptReregControl
This flag indicates the operational state of the Binding Re-
registration Control sub-option support. The default value for
this flag is set to (0), indicating that support for the Binding
Re-registration Control sub-option is disabled.
When this flag on the mobile access gateway is set to a value of
(1), the local mobility anchor SHOULD include this sub-option in
the Proxy Binding Acknowledge messages that it sends to the mobile
access gateway; otherwise, it SHOULD NOT include the sub-option.
There can be situations where the local mobility anchor is unable
to obtain the Binding Re-registration Control information and may
not be able to construct this sub-option.
EnableLCMPSubOptHeartbeatControl
This flag indicates the operational state of the Heartbeat Control
sub-option support. The default value for this flag is set to
(0), indicating that support for the Heartbeat Control sub-option
is disabled.
When this flag on the mobile access gateway is set to a value of
(1), the local mobility anchor SHOULD include this sub-option in
the Proxy Binding Acknowledge messages that it sends to the mobile
access gateway; otherwise, it SHOULD NOT include the sub-option.
There can be situations where the local mobility anchor is unable
to obtain the Heartbeat Control information and may not be able to
construct this sub-option.
The following variables MAY be defined at various granularity such as
per binding, per peering MAG, per cluster of MAGs or any other custom
grouping. Regardless of the granularity of this configuration, the
local mobility anchor should be able to determine the value of these
variables on an individual binding basis by way of configuration
hierarchy.
LCMPReregistrationStartTime
This variable is used to set the minimum time interval in number
of seconds before the expiry of the PMIPv6 binding lifetime when
the registration refresh process SHOULD be activated.
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LCMPInitialRetransmissionTime
This variable is used to set the minimum delay in seconds before
the first PBU retransmission of the exponential back-off process.
This variable is same as INITIAL_BINDACK_TIMEOUT mentioned in
Section 6.9.4 of [RFC5213].
LCMPMaximumRetransmissionTime
This variable is used to set the maximum delay in seconds before
the last PBU retransmission message of the exponential back-off
process. This variable is same as MAX_BINDACK_TIMEOUT mentioned
in Section 6.9.4 of [RFC5213].
LCMPHeartbeatInterval
This variable is used to set the time delay in seconds after a
successful heartbeat exchange (request followed by response) when
the next heartbeat exchange can be triggered. The default value
is 60 seconds. It SHOULD NOT be set to less than 30 seconds or
more than 3600 seconds. The value of this variable MAY be derived
from the variable HEARTBEAT_INTERVAL defined in Section 5 of
[RFC5847] if defined on the local mobility anchor.
LCMPHeartbeatRetransmissionDelay
This variable is used to set the minimum time delay in seconds
before a heartbeat message is retransmitted.. The value of this
variable SHOULD be less than LCMP_HEARTBEAT_INTERVAL. The default
value is 5 seconds.
LCMPHeartbeatMaxRetransmissions
This variable is used to set the maximum number of heartbeat
retransmissions. The default value for this variable is 3. The
value of this variable MAY be derived from the variable
MISSING_HEARTBEATS_ALLOWED defined in Section 5 of [RFC5847] if
defined on the local mobility anchor.
5. Protocol Considerations
The following considerations apply to the local mobility anchor and
the mobile access gateway.
The conceptual Binding Cache Entry data structure maintained by the
local mobility anchor, described in Section 5.1 of [RFC5213] and the
conceptual Binding Update List entry data structure maintained by the
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mobile access gateway, described in Section 6.1 of [RFC5213], MUST be
extended to store the LMA Controlled MAG Parameters option related
information elements associated with the current session.
Specifically the following parameters MUST be defined:
o LCMPReregistrationStartTime
o LCMPInitialRetransmissionTime
o LCMPMaximumRetransmissionTime
o LCMPHeartbeatInterval
o LCMPHeartbeatRetransmissionDelay
o LCMPHeartbeatMaxRetransmissions
5.1. Local Mobility Anchor Considerations
o On receiving a Proxy Binding Update message [RFC5213] from a
mobile access gateway, the local mobility anchor should check if
EnableLCMPSubOptReregControl is set to (1). If yes, and if all of
LCMPReregistrationStartTime, LCMPInitialRetransmissionTime and
LCMPMaximumRetransmissionTime are set to NON_ZERO values, then in
SHOULD include Binding Re-registration Control Sub-Option in the
LMA Controlled MAG Parameters mobility option which is in turn
included in the Proxy Binding Acknowledge message.
o If EnableLCMPSubOptReregControl is set to (1) and if any of
LCMPReregistrationStartTime, LCMPInitialRetransmissionTime and
LCMPMaximumRetransmissionTime is set to ZERO value, then the local
mobility anchor should report a configuration error.
o The local mobility anchor should also check if
EnableLCMPSubOptHeartbeatControl is set to (1). If yes, and if
all of LCMPHeartbeatInterval, LCMPHeartbeatRetransmissionDelay and
LCMPHeartbeatMaxRetransmissions are set to NON_ZERO values, then
in SHOULD include Heartbeat Control Sub-Option in the LMA
Controlled MAG Parameters mobility option which is in turn
included in the Proxy Binding Acknowledge message.
o If EnableLCMPSubOptHeartbeatControl is set to (1) and if any of
LCMPHeartbeatInterval, LCMPHeartbeatRetransmissionDelay and
LCMPHeartbeatMaxRetransmissions is set to ZERO value, then the
local mobility anchor should report a configuration error.
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5.2. Mobile Access Gateway Considerations
o On Receiving Proxy Binding Acknowledge message [RFC5213] from the
local mobility anchor with LMA Controlled MAG Parameters mobility
option, the mobile access gateway MUST overwrite the binding re-
registration related timer parameters with the parameters received
in Binding Re-registration Control Sub-Option, if present in the
LMA Controlled MAG Parameters mobility option. Similarly, the
mobile access gateway MUST overwrite the heartbeat related timer
parameters with the parameters reveived in Heartbeat Control Sub-
Option, if present in the LMA Controlled MAG Parameters mobility
option.
o If any of the parameters in the Binding Re-registration Control
Sub-Option is ZERO, then the sub-option MUST be ignored and an
error message SHOULD be logged.
o If any of the parameters in the Heartbeat Control Sub-Option
except HB-Retransmission-Delay is ZERO, then the sub-option MUST
be ignored and error message SHOULD be logged.
6. IANA Considerations
This document requires the following IANA actions.
o Action 1: This specification defines a new mobility header option,
the LMA Controlled MAG Parameters. This mobility option is
described in Section 3. The type value (IANA-1) for this option
needs to be assigned from the same numbering space as allocated
for the other mobility options, as defined in [RFC6275].
o Action 2: This specification defines a new mobility sub-option
format, the LMA Controlled MAG Parameters sub-option. The format
of this mobility sub-option is described in Section 3.1. This
sub-option can be carried in the LMA Controlled MAG Parameters
option. The type value for this sub-option needs to be managed by
IANA, under the registry "LMA Controlled MAG Parameters Sub-Option
Type Values". This specification reserves the following type
values. Approval of new LMA Controlled MAG Parameters sub-option
type values are to be made through IANA Expert Review.
+---+-----------------------------------------------------+
| 0 | Reserved |
+---+-----------------------------------------------------+
| 1 | Binding Re-registration Control Sub-Option |
+---+-----------------------------------------------------+
| 2 | Heartbeat Control Sub-Option |
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+---+-----------------------------------------------------+
7. Security Considerations
The LMA Controlled MAG Parameters option defined in this
specification is for use in Proxy Binding Acknowledgement message.
This option is carried like any other mobility header option as
specified in [RFC6275] and does not require any special security
considerations.
8. References
8.1. Normative References
[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>.
[RFC5213] Gundavelli, S., Ed., Leung, K., Devarapalli, V.,
Chowdhury, K., and B. Patil, "Proxy Mobile IPv6",
RFC 5213, DOI 10.17487/RFC5213, August 2008,
<http://www.rfc-editor.org/info/rfc5213>.
[RFC5847] Devarapalli, V., Ed., Koodli, R., Ed., Lim, H., Kant, N.,
Krishnan, S., and J. Laganier, "Heartbeat Mechanism for
Proxy Mobile IPv6", RFC 5847, DOI 10.17487/RFC5847,
June 2010, <http://www.rfc-editor.org/info/rfc5847>.
[RFC7563] Pazhyannur, R., Speicher, S., Gundavelli, S., Korhonen,
J., and J. Kaippallimalil, "Extensions to the Proxy Mobile
IPv6 (PMIPv6) Access Network Identifier Option", RFC 7563,
DOI 10.17487/RFC7563, June 2015,
<http://www.rfc-editor.org/info/rfc7563>.
8.2. Informative References
[RFC2460] Deering, S. and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", RFC 2460, DOI 10.17487/RFC2460,
December 1998, <http://www.rfc-editor.org/info/rfc2460>.
[RFC6275] Perkins, C., Ed., Johnson, D., and J. Arkko, "Mobility
Support in IPv6", RFC 6275, DOI 10.17487/RFC6275,
July 2011, <http://www.rfc-editor.org/info/rfc6275>.
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Authors' Addresses
Dhananjay Patki
Cisco
Cessna Business Park SEZ, Kadubeesanahalli
Bangalore, Karnataka 560087
India
Email: dhpatki@cisco.com
Sri Gundavelli
Cisco
170 West Tasman Drive
San Jose, CA 95134
USA
Email: sgundave@cisco.com
Jong-Hyouk Lee
Sangmyung University
31, Sangmyeongdae-gil, Dongnam-gu
Cheonan 330-720
Republic of Korea
Email: jonghyouk@smu.ac.kr
Qiao Fu
China Mobile
Xuanwumenxi Ave. No.32
Beijing
China
Email: fuqiao1@outlook.com
Lyle T Bertz
Sprint
Kansas
USA
Email: Lyle.T.Bertz@sprint.com
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