Which multihoming solution allows for high availability and load sharing of traffic?

Question

Options

• ARequesting a PA prefix from the connecting service providers and advertising both through BGP
• BRequesting a PI prefix from the regional registrar and advertising the prefix to connecting service
• CImplementing SHIM6 on WAN routers
• DImplementing LISP on WAN routers as xTR, which registers with the service providers' Map

• A
  4% (1)
• B
  79% (19)
• C
  4% (1)
• D
  13% (3)

Explanation

A Provider Independent (PI) prefix obtained from a Regional Internet Registry (such as ARIN or RIPE) is owned by the customer, not tied to any specific ISP. Advertising this PI prefix to multiple upstream ISPs via BGP is the standard multihoming solution that provides both high availability (traffic can reroute through the surviving ISP if one fails) and load sharing (traffic can be split across providers using BGP policy). Option A uses a Provider Aggregatable (PA) prefix tied to specific providers, which means losing a provider could make part of the address space unreachable. Option C (SHIM6) operates at the host level and lacks the load-sharing capability of BGP-based solutions. Option D (LISP as xTR) is an overlay-based approach that depends on the provider's mapping infrastructure and is not the standard enterprise multihoming design.

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