You are designing an IPv4 any source multicast redundancy solution. Which technology ensures the quickest RP convergence?

Question

Options

• ABootstrap router
• BMSDP anycast RP
• CAuto-RP
• DEmbedded RP

• A
  16% (4)
• B
  72% (18)
• C
  4% (1)
• D
  8% (2)

Explanation

MSDP Anycast RP provides the fastest convergence because multiple RPs simultaneously share the same anycast IP address and stay synchronized via MSDP. When one RP fails, routers immediately fail over to the nearest remaining RP through normal unicast routing reconvergence - no election process is required.

Why the distractors are wrong:

• A. Bootstrap Router (BSR): Requires a new BSR election followed by RP advertisement propagation across the network after a failure - adds significant delay.
• C. Auto-RP: Cisco-proprietary mechanism that depends on a Mapping Agent detecting failure and redistributing new RP mappings; default timers can make this take 60+ seconds.
• D. Embedded RP: IPv6-only technology (the RP is encoded in the group address prefix); it simply does not apply to IPv4 any-source multicast.

Memory tip: Anycast RP = "already everywhere." Since all RPs are active simultaneously and share one IP, failover is just a routing table update - not a new election. The other options all require someone to notice the failure and tell everyone, which takes longer.

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