111 © 2001, Cisco Systems, Inc. All rights reserved. Presentation_ID Mobile IPv4 Dynamic Home Agent...
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Transcript of 111 © 2001, Cisco Systems, Inc. All rights reserved. Presentation_ID Mobile IPv4 Dynamic Home Agent...
![Page 1: 111 © 2001, Cisco Systems, Inc. All rights reserved. Presentation_ID Mobile IPv4 Dynamic Home Agent Assignment Framework (draft-kulkarni-mobileip-dynamic-assignment-01.txt)](https://reader036.fdocuments.us/reader036/viewer/2022070412/5697bf8d1a28abf838c8c79b/html5/thumbnails/1.jpg)
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
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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
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Nearest HA Example
User moves to a distant location
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Nearest HA Example
Latency increases for registrations and tunneled traffic.
Home AgentMobile Node
Printer
Printer
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Dynamic HA Assignment
Dynamically assigned HAs to anchor mobility sessions initiated within regions
Home AgentMobile Node
Printer
Printer
Home Agent
X
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HA Assignment Methods
• DHCP – Home Agent Option 68
• AAA – 3GPP2 IS-835
• DNS – Hostname resolution
• Static configuration
• Etc.
Dynamic HA Assignment Framework
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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.
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Dynamic HA Assignment Framework
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
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Dynamic HA Assignment Framework
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
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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
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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
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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
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Discussion Points
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RFC 3344 Update
• The Home Agent MAY accept registration with assigned HA address different than in the registration request with unicast destination IP address
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Directed vs. Assigned
• Framework provides flexibility to allow assigned HA to be same or different than the target of registration requests
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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)
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Q & A