Load Balancing based on IPv6 Anycast and pseudoMobility draftluov6ops6manshim6lbam01 - PowerPoint PPT Presentation
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Load Balancing based on IPv6 Anycast and pseudoMobility draftluov6ops6manshim6lbam01
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Title: Load Balancing based on IPv6 Anycast and pseudoMobility draftluov6ops6manshim6lbam01
1
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
2
Outline
- Introduction
- Overview
- Operation of LBAM
- Conclusion
3
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.
4
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.
