Load Balancing based on IPv6 Anycast and pseudoMobility draftluov6ops6manshim6lbam01

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Load Balancing based on IPv6 Anycast and
pseudo-Mobility(draft-luo-v6ops-6man-shim6-lbam-0
1)

• Wanming Luo,Xiaodong Li
• Wei Mao,Mei Wang
• 2009-7-28

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Outline

• Introduction
• Overview
• Operation of LBAM
• Conclusion

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Introduction

• Load balancing across multiple servers would
  enhance responsiveness and scale well with
  session load.
• Both IPv4 to IPv6 transition mechanisms, e.g.
  NAT-PT, CGN (Carrier Grade NAT), NAT64 or Tunnel
  broker, and Multihoming require some kind of load
  balancing.

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Overview

• Anycast and pseudo-anycast
• Anycast was adopted by IPv6 specification suite .
• An IPv6 anycast address is an address that is
  assigned to more than one interface (typically
  belonging to different nodes)
• When a unicast address is assigned to more than
  one interface, it turns into an anycast address
  consequently.
• LBAM has two kinds of entity agent and the pool
  of servers, and all of those entities have a
  same anycast address.

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Overview

• Only the agent takes part in the routing system,
  and the other servers are "dumb" in routing
  system
• As for the server, it is the server's unicast
  address who takes part in the routing system.
• We call this kind of anycast "pseudo-anycast".
• Use IPv6 Routing header, in which the server's
  unicast address is just a intermediate address to
  be "visited" on the way to a very server's
  pseudo-anycast address

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Overview

• Overview of Mobile IPv6 and pseudo-mobility
• Each mobile node is always identified by its home
  address, a mobile node is also associated with a
  care-of address
• LBAM Agent will tunnel a packets destined to the
  pseudo-anycast address to the care-of address of
  one selected server, as if the server changed its
  point, even through the server is stationary in
  the same link
• In the extreme case, all the servers stationary
  at the same link permanently.
• We call the false mobility as "pseudo-mobility"

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Load Balancing based on IPv6 Anycast and
pseudo-Mobility(LBAM)

• Except those modifications followed, the other
  parts of LBAM Agent and servers are same as
  Mobile IPv6. So, it is to easy to implement LBAM
  based on Mobile IPv6.
• Modifying Binding Cache in LBAM Agent
• Adding Load Balancing History Cache in LBAM Agent
• Adding No Active Session Notice parameter

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Operations of LBAM
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Operations of LBAM

• (1) Address Request (URL)
• (2) Return the pseudo-anycast address
• (3) Send initial packet to LBAM Agent
• (4) Choose a "best" server by some load
  balancing algorithms, and log the Binding
• (5) Tunnel the packet to the server using IPv6
  encapsulation
• (6) Send Binding Update Message

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Operations of LBAM

• (7) Direct session between the server and the CN
• (8) Detect the session over or timeout
• (9) Annunciate the Agent the Binding is invalid.
• (9)Annunciate the CN the Binding is invalid.
• (10)Invalidate the corresponding Binding

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Operations of LBAM

• The other steps except (4)(8) and(10) are all
  ordinary operation in current IPv6 environment
  with mobile support
• Step(4)implements two functions
• to choose a "best" server by some load balancing
  algorithm,
• to log the binding

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Operations of LBAM

• Step (8) and(10) are mainly responsible for
  deleting the binding history in LBAM Agent.
• When a server detects an inactive session with a
  CN, it should send a message to alert the LBAM
  Agent for deleting.

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Conclusion

• The benefits of LBAM over other approaches are
  obvious
• seamless compatibility with current protocol,
• higher scalability,
• short delay time
• no topological constraint on Server pool,
• protecting previous investment.
• Easy deployment (only little patch at Server and
  LBAM Agent sides) Compared with other load
  balancing methods,
• LBAM has better performance and fewest problems
  in IPv6 environment.

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Conclusion

• We believe that this technology will be used
  broadly in workload intensive IPv6 application
  including client/server application environment,
  such as IPv4/6 transition gateway, WWW, Email,
  and multimedia services, as well as
  high-performance parallel computing.