NETEXT WG Seil Jeon
Internet Draft Institute de Telecomunicacoes
Intended status: Standard Track Younghan Kim
Expires: January 01, 2015 Soongsil University
July 01, 2014
Proxy Mobile IPv6 with Mobility Session Redirection
draft-sijeon-netext-pmip-msr-01.txt
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Abstract
This specification describes an enhanced mobility anchoring for mid-
session mobility over Proxy Mobile IPv6 networks.
Table of Contents
1. Introduction ................................................. 2
2. Overview ..................................................... 2
3. Selecting a Target Local Mobility Anchor ..................... 4
3.1. Based on the Ordered List ............................... 4
3.2. Based on Load Monitoring Entity ......................... 4
3.3. Based on Explicit Signaling ............................. 4
3.4. Periodic Load Information Broadcasting Among LMAs ....... 4
4. IP Session Continuity ........................................ 5
5. Security Considerations ...................................... 5
6. IANA Considerations .......................................... 5
7. References ................................................... 5
7.1. Normative References .................................... 5
1. Introduction
Proxy Mobile IPv6 (PMIPv6) specification allows no provision to
switch a Local Mobility Anchor (LMA) to another LMA during mid-
session when an LMA may need to handoff a mobile node (MN) to
another LMA for load balancing or maintenance purpose.
RFC 6463 describes the runtime LMA assignment functionality and the
protocol extension for PMIPv6. However, it is defined only for
initial registration process not in the case of mid-session.
This specification describes a procedure and assisted methods for
switching a current LMA to a target LMA, called mobility session
redirection, in short MSR.
2. Overview
The mobility session redirection (MSR) relies on the runtime LMA
assignment scheme defined in [RFC6463].
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MN MAG LMA1 LMA2 CN
| | | | |
|<----------|====== DATA =====|-------------|----------->|
| | | | |
| | | | |
| | Overload | |
| | detected | |
| | | | |
| | Select an MN to be | |
| | handed over to LMA2 | |
| | | | |
| | | | |
| |<--(LB Warning)--| | |
| | | | |
| |------(PBU)----->| | |
| |(binding refresh)| | |
| | | | |
| | |---- PBU --->| |
| | | | |
| | |<--- PBA ----| |
| | | | |
| |<----- PBA ------| | |
| | | | |
| | | | |
|<----------|========== DATA ===============| |
| | | | |
Figure 1 An LMA switching procedure
Figure 1 shows the message sequence procedure for the LMA switching
operation. Suppose that each LMA has a load threshold it can endure.
When load reaches the threshold of acceptable capacity of LMA1, LMA
switching is then activated for a selected mobile node (MN). When
the load reaches the absolute maximum capacity allowed in LMA1, LMA1
sends load balancing (LB) warning indication to the determined MAG
to have a specific LMA switching request such as a designated LMA.
For the warning indication, the update notification mechanism,
defined in [RFC7077], as to induce the binding refresh request can
be utilized.
However, LMA switching can be determined by the MAG in the allowed
LMA load condition. So, the MAG can reject the LMA switching not to
prevent an on-going session activity. When the MAG has a designated
LMA address to switch the current one in the ordered list, the
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target LMA address is delivered by an added option message in the
PBU signaling message. For the option message, Redirect Mobility
Option, defined in [RFC6463], can be used. When the MAG is no
designated LMA address, null is given. Alternatively, when the load
reaches the absolute maximum capacity allowed in LMA1, LMA1 does not
wait for the next refresh binding request of Proxy Binding Update
(PBU) message, and can proceed sending the PBU message for LMA
switching towards LMA2. Once a chosen MN gets successfully
redirected at LMA2, LMA2 takes the anchoring role for the MN so that
data traffic between the MN and CNs is anchored at LMA2.
3. Selecting a Target Local Mobility Anchor
3.1. Based on the Ordered List
MAG may choose a target LMA in the ordered list it for switching the
current one. When the contacted LMA is failed to switch, the
subsequent LMA is tried to switch the current LMA again.
3.2. Based on Load Monitoring Entity
On the presence of load monitoring server of the deployed LMAs, the
LMA can rely on the load monitoring server to know load status of
target LMAs.
3.3. Based on Explicit Signaling
A distributed approach can be utilized between LMAs to check load
status of target LMA by internally defined signaling messages or the
external mechanisms such as IEEE 802.21 signaling primitives or
peer-to-peer (P2P) approach.
3.4. Periodic Load Information Broadcasting Among LMAs
Load information can be obtained from periodic load information
broadcasting of all the available LMAs. The LMA preparing the LMA
switching can base the obtain information to select a target LMA.
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4. IP Session Continuity
The proposed LMA switching can be used, regardless of IP session
continuity. When the LMA switching occurs, the MN needs to configure
a new home network prefix (HNP) allocated from the prefix pool of
the redirected LMA. IP session continuity support might be difficult
in PMIPv6. But in case where all LMAs are connected behind a switch
and configured with a shared network prefix on egress interfaces of
the LMAs, Proxy Neighbor Discovery (ND) can be used to deliver the
packets destined to the MN. In the configured network, the use of
Anycast routing can be another option to let the MN exchange its
traffic with a new LMA.
5. Security Considerations
T.B.D.
6. IANA Considerations
T.B.D.
7. References
7.1. Normative References
[RFC2119] S. Bradner, "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC5213] S. Gundavelli, K. Leung, V. Devarapalli, K. Chowdury, and
B.Patil, "Proxy Mobile IPv6," IETF RFC 5213, Aug. 2008.
[RFC6463] J. Korhonen, S. Gundavelli, H. Yokota, and X. Cui,
"Runtime Local Mobility Anchor (LMA) Assignment Support,"
IETF RFC 6463, Feb.2012.
[RFC7077] S. Krishnan, S. Gundavelli, M. Liebsch, H. Yokota, and J.
Koronen, "Update Notifications for Proxy Mobile IPv6,"
IETF RFC 7077, Nov. 2013.
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Authors' Addresses
Seil Jeon
Instituto de Telecomunicacoes
Campus Universitario de Santiago
Aveiro 3810-193, Portugal
seiljeon@av.it.pt
Younghan Kim
Soongsil University
Sangdo-dong, Dongjak-gu
Seoul 511, Republic of Korea
younghak@ssu.ac.kr
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