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This concern applies to IS-IS conditional default route in a different scenario where operators need to advertise a default route only under a defined service-availability condition. For the deployed IS-IS IPv6 multitopology approach, the relevant caution is instead that multitopology requires consistent capabilities on intended neighbors.

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 IPv6 multitopology approach, the relevant caution is instead that multitopology requires consistent capabilities on intended neighbors.

This concern applies to OSPF external metric distinction in a different scenario where operators need to choose between internal-cost-aware and fixed-external-cost path treatment. For the deployed IS-IS IPv6 multitopology approach, the relevant caution is instead that multitopology requires consistent capabilities on intended neighbors.

IS-IS metric traffic engineering instead addresses a different condition: prefer a lower-cost IGP path without changing BGP administrative preferences. It would instead require you to adjust supported IS-IS interface metrics to influence shortest-path computation, not the stated goal to run IPv4 and IPv6 under a common IS-IS topology when links support both.

DS-Lite IPv4 transport over IPv6 instead addresses a different condition: carry a subscriber IPv4 service over an IPv6-only access network. It would instead require you to tunnel subscriber IPv4 packets to a provider AFTR for IPv4 address translation, not the stated goal to run IPv4 and IPv6 under a common IS-IS topology when links support both.

BGP AS-path prepending instead addresses a different condition: make one advertised path less attractive to neighboring autonomous systems. It would instead require you to prepend a suitable number of the advertising AS in the outbound AS path, not the stated goal to run IPv4 and IPv6 under a common IS-IS topology when links support both.

The proposed step is for IS-IS metric traffic engineering, whose purpose is to prefer a lower-cost IGP path without changing BGP administrative preferences. It would not perform the necessary IS-IS single-topology coexistence operation: configure the appropriate single-topology address-family behavior consistently.

The proposed step is for DS-Lite IPv4 transport over IPv6, whose purpose is to carry a subscriber IPv4 service over an IPv6-only access network. It would not perform the necessary IS-IS single-topology coexistence operation: configure the appropriate single-topology address-family behavior consistently.

The proposed step is for BGP AS-path prepending, whose purpose is to make one advertised path less attractive to neighboring autonomous systems. It would not perform the necessary IS-IS single-topology coexistence operation: configure the appropriate single-topology address-family behavior consistently.

The observation would verify IS-IS metric traffic engineering under the separate requirement to prefer a lower-cost IGP path without changing BGP administrative preferences. It does not demonstrate the needed IS-IS single-topology coexistence result: both address families calculate paths using the shared topology.

The observation would verify DS-Lite IPv4 transport over IPv6 under the separate requirement to carry a subscriber IPv4 service over an IPv6-only access network. It does not demonstrate the needed IS-IS single-topology coexistence result: both address families calculate paths using the shared topology.

The observation would verify BGP AS-path prepending under the separate requirement to make one advertised path less attractive to neighboring autonomous systems. It does not demonstrate the needed IS-IS single-topology coexistence result: both address families calculate paths using the shared topology.

This defect belongs to IS-IS metric traffic engineering, where the affected outcome is to prefer a lower-cost IGP path without changing BGP administrative preferences. It is not the direct failure mode identified for the IS-IS single-topology coexistence design in this case: IPv6 is enabled on only part of the common SPF topology.

This defect belongs to DS-Lite IPv4 transport over IPv6, where the affected outcome is to carry a subscriber IPv4 service over an IPv6-only access network. It is not the direct failure mode identified for the IS-IS single-topology coexistence design in this case: IPv6 is enabled on only part of the common SPF topology.

This defect belongs to BGP AS-path prepending, where the affected outcome is to make one advertised path less attractive to neighboring autonomous systems. It is not the direct failure mode identified for the IS-IS single-topology coexistence design in this case: IPv6 is enabled on only part of the common SPF topology.

This concern applies to IS-IS metric traffic engineering in a different scenario where operators need to prefer a lower-cost IGP path without changing BGP administrative preferences. For the deployed IS-IS single-topology coexistence approach, the relevant caution is instead that shared topology assumes participating links can forward both families.

This concern applies to DS-Lite IPv4 transport over IPv6 in a different scenario where operators need to carry a subscriber IPv4 service over an IPv6-only access network. For the deployed IS-IS single-topology coexistence approach, the relevant caution is instead that shared topology assumes participating links can forward both families.

This concern applies to BGP AS-path prepending in a different scenario where operators need to make one advertised path less attractive to neighboring autonomous systems. For the deployed IS-IS single-topology coexistence approach, the relevant caution is instead that shared topology assumes participating links can forward both families.

IS-IS wide metric scale instead addresses a different condition: use traffic-engineering metric values beyond the narrow-metric limit. It would instead require you to enable supported wide-metric processing for the provider IS-IS domain, not the stated goal to keep a restarting provider router from attracting transit traffic before it converges.

BGP neighbor TCP authentication instead addresses a different condition: ensure an external BGP session establishes only with peers possessing the agreed session authentication material. It would instead require you to configure supported matching BGP neighbor TCP authentication credentials at both peers, not the stated goal to keep a restarting provider router from attracting transit traffic before it converges.

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 keep a restarting provider router from attracting transit traffic before it converges.

The proposed step is for IS-IS wide metric scale, whose purpose is to use traffic-engineering metric values beyond the narrow-metric limit. It would not perform the necessary IS-IS startup overload safety operation: advertise an IS-IS overload condition during startup as supported.

The proposed step is for BGP neighbor TCP authentication, whose purpose is to ensure an external BGP session establishes only with peers possessing the agreed session authentication material. It would not perform the necessary IS-IS startup overload safety operation: advertise an IS-IS overload condition during startup as supported.

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 startup overload safety operation: advertise an IS-IS overload condition during startup as supported.

The observation would verify IS-IS wide metric scale under the separate requirement to use traffic-engineering metric values beyond the narrow-metric limit. It does not demonstrate the needed IS-IS startup overload safety result: neighbors avoid the recovering router as an intermediate transit path.

The observation would verify BGP neighbor TCP authentication under the separate requirement to ensure an external BGP session establishes only with peers possessing the agreed session authentication material. It does not demonstrate the needed IS-IS startup overload safety result: neighbors avoid the recovering router as an intermediate transit path.

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 startup overload safety result: neighbors avoid the recovering router as an intermediate transit path.

This defect belongs to IS-IS wide metric scale, where the affected outcome is to use traffic-engineering metric values beyond the narrow-metric limit. It is not the direct failure mode identified for the IS-IS startup overload safety design in this case: the router advertises normal transit metrics before its services are ready.

This defect belongs to BGP neighbor TCP authentication, where the affected outcome is to ensure an external BGP session establishes only with peers possessing the agreed session authentication material. It is not the direct failure mode identified for the IS-IS startup overload safety design in this case: the router advertises normal transit metrics before its services are ready.

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 startup overload safety design in this case: the router advertises normal transit metrics before its services are ready.

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.