300-420 · Question #221
Refer to the exhibit. An architect is designing an EIGRP solution based on these requirements: - Traffic forwarding should use the best two paths while all links are available - Single path failure…
The correct answer is D. Variance 2. To enable EIGRP to use the best two unequal-cost paths for forwarding traffic and provide redundancy without re-convergence, the variance command must be configured.
Question
Refer to the exhibit. An architect is designing an EIGRP solution based on these requirements:
- Traffic forwarding should use the best two paths while all links are
available
- Single path failure must not impact traffic between branch and HQ
Which solution must the architect select?
Exhibit
Options
- AMaximum-paths 2
- BAdd-paths 2
- CMetric weights 010100
- DVariance 2
How the community answered
(15 responses)- A7% (1)
- B13% (2)
- D80% (12)
Why each option
To enable EIGRP to use the best two unequal-cost paths for forwarding traffic and provide redundancy without re-convergence, the variance command must be configured.
`maximum-paths 2` enables equal-cost load balancing; it would not use two paths if they have different costs.
`add-paths` is typically a BGP feature used for advertising multiple paths, not an EIGRP command for unequal-cost load balancing.
`metric weights` modifies the EIGRP metric calculation but does not directly enable unequal-cost load balancing or redundant path installation based on the stated requirements.
The `variance` command in EIGRP allows the router to install multiple unequal-cost paths to a destination in the routing table, provided their feasible distance is within the specified variance multiplier of the successor's feasible distance. This fulfills the requirement for using the 'best two paths' even if their costs are unequal, and ensures immediate failover upon a single path failure.
Concept tested: EIGRP unequal cost load balancing with variance
Source: https://www.cisco.com/c/en/us/td/docs/ios/iproute_eigrp/configuration/guide/ire_config/ire_cfg_chap4.html
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