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This concern applies to IS-IS wide metric scale in a different scenario where operators need to use traffic-engineering metric values beyond the narrow-metric limit. For the deployed IS-IS startup overload safety approach, the relevant caution is instead that a prolonged overload condition reduces available core transit capacity.

This concern applies to BGP neighbor TCP authentication in a different scenario where operators need to ensure an external BGP session establishes only with peers possessing the agreed session authentication material. For the deployed IS-IS startup overload safety approach, the relevant caution is instead that a prolonged overload condition reduces available core transit capacity.

This concern applies to graceful restart helper coordination in a different scenario where operators need to allow a neighbor's control-plane restart without immediately invalidating forwarding. For the deployed IS-IS startup overload safety approach, the relevant caution is instead that a prolonged overload condition reduces available core transit capacity.

IS-IS IPv6 multitopology instead addresses a different condition: advertise IPv6 links whose topology differs from the IPv4 forwarding graph. It would instead require you to enable the supported multitopology IS-IS IPv6 address-family behavior, not the stated goal to prefer a lower-cost IGP path without changing BGP administrative preferences.

BGP prefix filtering instead addresses a different condition: stop a customer's accidental broad route advertisement at the provider ingress. It would instead require you to attach a prefix-set based inbound routing policy with exact allowed subnets, not the stated goal to prefer a lower-cost IGP path without changing BGP administrative preferences.

BGP graceful restart forwarding retention instead addresses a different condition: retain eligible forwarding state briefly while the BGP control process restarts. It would instead require you to configure BGP graceful restart with compatible helper behavior and timers, not the stated goal to prefer a lower-cost IGP path without changing BGP administrative preferences.

The proposed step is for IS-IS IPv6 multitopology, whose purpose is to advertise IPv6 links whose topology differs from the IPv4 forwarding graph. It would not perform the necessary IS-IS metric traffic engineering operation: adjust supported IS-IS interface metrics to influence shortest-path computation.

The proposed step is for BGP prefix filtering, whose purpose is to stop a customer's accidental broad route advertisement at the provider ingress. It would not perform the necessary IS-IS metric traffic engineering operation: adjust supported IS-IS interface metrics to influence shortest-path computation.

The proposed step is for BGP graceful restart forwarding retention, whose purpose is to retain eligible forwarding state briefly while the BGP control process restarts. It would not perform the necessary IS-IS metric traffic engineering operation: adjust supported IS-IS interface metrics to influence shortest-path computation.

The observation would verify IS-IS IPv6 multitopology under the separate requirement to advertise IPv6 links whose topology differs from the IPv4 forwarding graph. It does not demonstrate the needed IS-IS metric traffic engineering result: the shortest-path cost and forwarding next hop reflect the intended links.

The observation would verify BGP prefix filtering under the separate requirement to stop a customer's accidental broad route advertisement at the provider ingress. It does not demonstrate the needed IS-IS metric traffic engineering result: the shortest-path cost and forwarding next hop reflect the intended links.

The observation would verify BGP graceful restart forwarding retention under the separate requirement to retain eligible forwarding state briefly while the BGP control process restarts. It does not demonstrate the needed IS-IS metric traffic engineering result: the shortest-path cost and forwarding next hop reflect the intended links.

This defect belongs to IS-IS IPv6 multitopology, where the affected outcome is to advertise IPv6 links whose topology differs from the IPv4 forwarding graph. It is not the direct failure mode identified for the IS-IS metric traffic engineering design in this case: BGP local preference is changed for a route controlled solely by IS-IS metrics.

This defect belongs to BGP prefix filtering, where the affected outcome is to stop a customer's accidental broad route advertisement at the provider ingress. It is not the direct failure mode identified for the IS-IS metric traffic engineering design in this case: BGP local preference is changed for a route controlled solely by IS-IS metrics.

This defect belongs to BGP graceful restart forwarding retention, where the affected outcome is to retain eligible forwarding state briefly while the BGP control process restarts. It is not the direct failure mode identified for the IS-IS metric traffic engineering design in this case: BGP local preference is changed for a route controlled solely by IS-IS metrics.

This concern applies to IS-IS IPv6 multitopology in a different scenario where operators need to advertise IPv6 links whose topology differs from the IPv4 forwarding graph. For the deployed IS-IS metric traffic engineering approach, the relevant caution is instead that metric changes may affect many prefixes sharing the modified link.

This concern applies to BGP prefix filtering in a different scenario where operators need to stop a customer's accidental broad route advertisement at the provider ingress. For the deployed IS-IS metric traffic engineering approach, the relevant caution is instead that metric changes may affect many prefixes sharing the modified link.

This concern applies to BGP graceful restart forwarding retention in a different scenario where operators need to retain eligible forwarding state briefly while the BGP control process restarts. For the deployed IS-IS metric traffic engineering approach, the relevant caution is instead that metric changes may affect many prefixes sharing the modified link.

IS-IS level-1 local-area reachability instead addresses a different condition: keep IS-IS routes within an area while preserving local Level-1 forwarding. It would instead require you to configure Level-1 operation and matching area identifiers for those routers, not the stated goal to use traffic-engineering metric values beyond the narrow-metric limit.

graceful restart helper coordination instead addresses a different condition: allow a neighbor's control-plane restart without immediately invalidating forwarding. It would instead require you to configure compatible graceful restart roles and bounded stale-route timers, not the stated goal to use traffic-engineering metric values beyond the narrow-metric limit.

BGP remote AS alignment instead addresses a different condition: form an external BGP peering between provider and customer autonomous systems. It would instead require you to configure each peer with the other's correct remote AS and IP reachability, not the stated goal to use traffic-engineering metric values beyond the narrow-metric limit.

The proposed step is for IS-IS level-1 local-area reachability, whose purpose is to keep IS-IS routes within an area while preserving local Level-1 forwarding. It would not perform the necessary IS-IS wide metric scale operation: enable supported wide-metric processing for the provider IS-IS domain.

The proposed step is for graceful restart helper coordination, whose purpose is to allow a neighbor's control-plane restart without immediately invalidating forwarding. It would not perform the necessary IS-IS wide metric scale operation: enable supported wide-metric processing for the provider IS-IS domain.

The proposed step is for BGP remote AS alignment, whose purpose is to form an external BGP peering between provider and customer autonomous systems. It would not perform the necessary IS-IS wide metric scale operation: enable supported wide-metric processing for the provider IS-IS domain.

The observation would verify IS-IS level-1 local-area reachability under the separate requirement to keep IS-IS routes within an area while preserving local Level-1 forwarding. It does not demonstrate the needed IS-IS wide metric scale result: neighbors accept the extended metric information and compute expected SPF.

The observation would verify graceful restart helper coordination under the separate requirement to allow a neighbor's control-plane restart without immediately invalidating forwarding. It does not demonstrate the needed IS-IS wide metric scale result: neighbors accept the extended metric information and compute expected SPF.

The observation would verify BGP remote AS alignment under the separate requirement to form an external BGP peering between provider and customer autonomous systems. It does not demonstrate the needed IS-IS wide metric scale result: neighbors accept the extended metric information and compute expected SPF.

This defect belongs to IS-IS level-1 local-area reachability, where the affected outcome is to keep IS-IS routes within an area while preserving local Level-1 forwarding. It is not the direct failure mode identified for the IS-IS wide metric scale design in this case: a large metric is configured while peers process only narrow metric encoding.

This defect belongs to graceful restart helper coordination, where the affected outcome is to allow a neighbor's control-plane restart without immediately invalidating forwarding. It is not the direct failure mode identified for the IS-IS wide metric scale design in this case: a large metric is configured while peers process only narrow metric encoding.

This defect belongs to BGP remote AS alignment, where the affected outcome is to form an external BGP peering between provider and customer autonomous systems. It is not the direct failure mode identified for the IS-IS wide metric scale design in this case: a large metric is configured while peers process only narrow metric encoding.

This concern applies to IS-IS level-1 local-area reachability in a different scenario where operators need to keep IS-IS routes within an area while preserving local Level-1 forwarding. For the deployed IS-IS wide metric scale approach, the relevant caution is instead that mismatched metric styles can produce inconsistent path selection.

This concern applies to graceful restart helper coordination in a different scenario where operators need to allow a neighbor's control-plane restart without immediately invalidating forwarding. For the deployed IS-IS wide metric scale approach, the relevant caution is instead that mismatched metric styles can produce inconsistent path selection.

This concern applies to BGP remote AS alignment in a different scenario where operators need to form an external BGP peering between provider and customer autonomous systems. For the deployed IS-IS wide metric scale approach, the relevant caution is instead that mismatched metric styles can produce inconsistent path selection.