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Load Balancing for Distributed Home Agents in Mobile IPv6

This document proposes a load balancing mechanism among multiple home agents in a mobile IPv6 network to reduce overload and achieve better traffic distribution. It introduces a Home Agents List extension and a Home Agent Handoff message to facilitate load balancing and reassignment of mobile nodes.

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Load Balancing for Distributed Home Agents in Mobile IPv6

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  1. Load Balance for Distributed Home Agents in Mobile IPv6draft-deng-mip6-ha-loadbalance-02.txt Hui Deng Hitachi (China) Brian Haley Hewlett-Packard Company Xiaodong Duan China Mobile Rong Zhang China Telecom Kai Zhang Tsinghua Univ.

  2. Reasons • There are many reasons a home agent might want to reduce the number of mobile nodes it is currently supporting. For example, it might be overloaded, it wants to achieve better load-balancing between a peer home agent, or it is going offline for service.

  3. Motivation - 1 • When the home agent is supporting a large number of mobile nodes and actively tunneling traffic to them, it could become overloaded, leading to dropped packets and connections.

  4. Motivation - 2 • Dynamic Home Agent Address Discovery (DHAAD) can be used to find another home agent, but the mobile node has no way of knowing that it should attempt this method until it has problems contacting its current home agent.

  5. Effects • This protocol defines a load balance mechanism among multiple home agents which can effectively release and prevent the formation of traffic bottleneck at the home agent.

  6. Proposal • We extend the Home Agents List to support load balance information so it can share registration information among the home agents in the home netowrk to make decisions for home agent reassignment. • New Load Balance Information Option • 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 • +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+--+-+-+-+-+-+-+-+-+-+ • | Type | Length | Reserved | • +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+--+-+-+-+ • | Available Mobile Node Number | • +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+--+-+-+-+

  7. Home Agent Handoff message home agent to signal the mobile node it should use another home agent for subsequent Binding Updates. • 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 • +-+-+-+-+-+-+-+-+-+-+-+-+-+-+ • | Reserved | • +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- • | | • + + • | | • + Home Agent Address + • | | • + + • | | • +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

  8. Security Consideration Visited Network | Home Network | | | +-------+ | | AAA | +-------+ | +-------+ +--------| HA1 | | | | +-------+ | | | | | | +------+ | +-------+ | +-------+ | MN |<--------|-------->| BCF |---+--------| HA2 | +------+ | +-------+ | +-------+ | | ... | | | | +-------+ | +--------| HAn | | +-------+

  9. Work Item?

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