111 © 2001, cisco systems, inc. all rights reserved. presentation_id mobile ipv4 dynamic home agent...

111© 2001, Cisco Systems, Inc. All rights reserved.Presentation_ID

Mobile IPv4 Dynamic Home Agent Mobile IPv4 Dynamic Home Agent Assignment FrameworkAssignment Framework

(draft-kulkarni-mobileip-dynamic-assignment-01.txt)(draft-kulkarni-mobileip-dynamic-assignment-01.txt)

5757thth IETF Vienna – 7/14/2003 IETF Vienna – 7/14/2003

Milind KulkarniMilind KulkarniAlpesh PatelAlpesh PatelKent LeungKent Leung

222

Problem Statements

• Optimal Home Agent for geographically / topologically distant locations

• Reduce configuration needs on Mobile Nodes (HA not required)

• Allow network to select and administratively assign HA to MN

• Load balance MNs among multiple HAs

333

Nearest HA Example

User moves to a distant location

444

Nearest HA Example

Latency increases for registrations and tunneled traffic.

Home AgentMobile Node

Printer

Printer

555

Dynamic HA Assignment

Dynamically assigned HAs to anchor mobility sessions initiated within regions

Home AgentMobile Node

Printer

Printer

Home Agent

X

666

HA Assignment Methods

• DHCP – Home Agent Option 68

• AAA – 3GPP2 IS-835

• DNS – Hostname resolution

• Static configuration

• Etc.

Dynamic HA Assignment Framework

777

Terminology

• ALL-ZERO-ONE-ADDR (AZOA): IP address 0.0.0.0 or 255.255.255.255.

• Directed HA: Destination IP address of the Registration Request to targeted Home Agent.

• Assigned HA: IP address in the Home Agent field of an accepted Registration Reply. The designated Home Agent for the duration of the mobility session.

888


Foreign Agent

Mobile Node

Home Agent

Router

D S

RRPCOA

or CCOAHA

AssignedHAA

…

HA

D S

RRQDirected

HACOA

or CCOAAZOA

or HAA…

HA

COACOA

CCOACCOA

DirectedHA

AssignedHAA

Initial Registration Control Flow

999


Foreign Agent

Mobile Node

Home Agent

Router

D S

RRPCOA

or CCOAHA

AssignedHAA

…

HA

D S

RRQDirected

HACOA

or CCOAAssigned

HA…

HA

COACOA

CCOACCOA

AssignedHA

AssignedHAA

Re-registration Control Flow

101010

HA Redirection

Foreign Agent

Mobile Node

HomeAgent

Router

D S

RRPCOA

or CCOAHA

AssignedHAA

…

HA

D S

RRQDirected

HACOA

or CCOAAZOA

or HAA…

HA

COACOA

CCOACCOA

Initial Registration Control Flow

111111

HA Redirection

Foreign Agent

Mobile Node

HomeAgent

Router

D S

RRPCOA

or CCOAHA

AssignedHAA

…

HA

D S

RRQAssigned

HACOA

or CCOAAssigned

HAA…

HA

COACOA

CCOACCOA

Re-registration Control Flow

121212

AZOA Application

• Mobile Node registers to Assigned HA for duration of mobility session

• AZOA should be used to initiate a new mobility session

Time

AZOA used

Assigned HA usedRegistration Requests

Sta

rt

Sto

p

Sto

p

Sta

rt

13

Discussion Points

141414

RFC 3344 Update

• The Home Agent MAY accept registration with assigned HA address different than in the registration request with unicast destination IP address

151515

Directed vs. Assigned

• Framework provides flexibility to allow assigned HA to be same or different than the target of registration requests

161616

MN-HA Security Considerations

• MN – HA SA manually configured or dynamic established, dependent on method

• MN – HA SA may be per HA or per administratively domain (for HAs within)

171717

Q & A

111 © 2001, cisco systems, inc. all rights reserved. presentation_id mobile ipv4 dynamic home agent...

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