MNHA Signaling for HA Unavailability

1
MN-HA Signaling for HA Unavailability

• Brian Haley, Vijay Devarapalli, Deng Hui, James
  Kempf

2
Why?

• Some reasons a signaling mechanism is needed
• HA going offline
• HA overloaded
• HA address changing
• Bootstrapping

3
Previous drafts

• draft-wakikawa-mip6-nemo-haha-spec-00.txt
• Defines a Home Agent switch message
• A new Mobility Header type to switch a Mobile
  Node to another Home Agent
• draft-deng-mip6-ha-loadbalance-02
• Uses new Mobility Header type to send a single
  Home Agent address to a Mobile Node
• Previously used DHAAD
• draft-kempf-mip6-ha-alert-00
• Uses new ICMPv6 message to send multiple Home
  Agent addresses to a Mobile Node
• Each draft defines its own security required for
  messages

4
Proposed WG Draft
http//www.ietf.org/internet-drafts/draft-haley-mi
p6-mh-signaling-01.txt
5
New Messages

• New Mobility Header type from HA to MN
• Signals to the MN that it wont serve the MN any
  longer
• Suggests one or more alternate HA addresses
• MN can pick the alternate HA from the message or
  perform bootstrapping/DHAAD again
• New Mobility Header type from MN to HA
  acknowledging the above message
• IPsec protection
• RFC 3775 BU/BAck SA is used

6
Mobility Header Signalling Request
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
----------------
A Reserved
Sequence -----------------
---------------

.
..
Mobility options . .

.
-------------
-------------------
7
Mobility Header Signaling Acknowledgment
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
----------------
Status
Sequence ----------------
----------------

.
. .
Mobility options . .

.
-------------
-------------------
8
Work Needed Yet

• Add option for alternate HA addresses
• Dropped when we were considering more general
  signaling

9
Future

• Other approaches?
• Become WG Document?
• Comments?