Which Attribute Eliminates LFAs for Common Fiber Connections?
Question
Which attribute eliminates LFAs that belong to protected paths in situations where links in a network are connected through a common fiber?
Answers
Explanations
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A. B. C. D.B.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/xe-3s/asr1000/ire-xe-3s-asr1000/ire-ipfrr.htmlThe correct answer is A. shared risk link group-disjoint.
In a network where links are connected through a common fiber, failures can occur that affect multiple links at the same time. In such a scenario, a link-protection mechanism such as Loop-Free Alternate (LFA) may not be sufficient to ensure that traffic is not affected.
Shared Risk Link Group (SRLG) is a mechanism that identifies a set of links that share a common risk of failure. SRLG-disjoint is a constraint that requires the primary and backup paths to have no links in common within the same SRLG.
By using SRLG-disjoint, we can ensure that the backup path (LFA) does not share any links with the protected path, thereby avoiding the risk of a common failure affecting both paths.
Option B, linecard-disjoint, is not a valid attribute in this context. Linecard-disjoint refers to a protection mechanism that ensures that the primary and backup paths use different line cards on the same router.
Option C, lowest-repair-path-metric, is not a valid attribute in this context. The lowest-repair-path-metric refers to a mechanism that selects the backup path based on the lowest repair path metric.
Option D, interface-disjoint, is not a valid attribute in this context. Interface-disjoint refers to a protection mechanism that ensures that the primary and backup paths use different physical interfaces on the same router.
