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300-320 · Question #182

Two recently merged companies are using EIGRP and RIP. Which two strategies can facilitate a smooth migration? (Choose two.)

The correct answer is C. Add EIGRP and then remove RIP on the acquired company network. D. Use the EIGRP administrative distance to migrate one site at a time. When two companies using different routing protocols merge, replacing RIP with EIGRP incrementally and using EIGRP administrative distance tuning are the smoothest migration strategies.

Advanced Addressing and Routing Solutions

Question

Two recently merged companies are using EIGRP and RIP. Which two strategies can facilitate a smooth migration? (Choose two.)

Options

  • ACreate an OSPF instance between EIGRP and RIP routing domains.
  • BRedistribute routing information between the RIP and EIGRP protocols.
  • CAdd EIGRP and then remove RIP on the acquired company network.
  • DUse the EIGRP administrative distance to migrate one site at a time.
  • EUse static routes in place of dynamic routing between companies.

How the community answered

(32 responses)
  • A
    6% (2)
  • B
    3% (1)
  • C
    75% (24)
  • E
    16% (5)

Why each option

When two companies using different routing protocols merge, replacing RIP with EIGRP incrementally and using EIGRP administrative distance tuning are the smoothest migration strategies.

ACreate an OSPF instance between EIGRP and RIP routing domains.

Introducing a third routing protocol (OSPF) as an intermediary between EIGRP and RIP adds unnecessary complexity, additional redistribution points, and potential for routing loops.

BRedistribute routing information between the RIP and EIGRP protocols.

Redistributing between RIP and EIGRP is technically possible but introduces risks of routing loops, suboptimal path selection, and the need for careful metric manipulation.

CAdd EIGRP and then remove RIP on the acquired company network.Correct

Enabling EIGRP on the acquired company's routers first and then decommissioning RIP provides a controlled, verifiable cutover that preserves routing continuity throughout the migration without requiring redistribution complexity.

DUse the EIGRP administrative distance to migrate one site at a time.Correct

EIGRP's administrative distance (default 90 for internal routes) can be selectively adjusted per route source, enabling engineers to migrate one site at a time by making EIGRP routes preferred over RIP routes (AD 120) in a controlled, incremental sequence.

EUse static routes in place of dynamic routing between companies.

Static routes are not scalable for complex enterprise networks with many destinations and would create a large administrative burden during and after the migration.

Concept tested: Routing protocol migration strategy EIGRP and RIP

Source: https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/16406-eigrp-toc.html

Topics

#EIGRP migration#RIP to EIGRP#routing protocol redistribution#administrative distance

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