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This concern applies to CGNAT address sharing logging in a different scenario where operators need to serve multiple IPv4 subscribers from shared public address resources. For the deployed DS-Lite IPv4 transport over IPv6 approach, the relevant caution is instead that AFTR placement and tunnel MTU can affect performance.

This concern applies to RPL route policy execution order in a different scenario where operators need to apply an explicit route reject before a broad default permit condition. For the deployed DS-Lite IPv4 transport over IPv6 approach, the relevant caution is instead that AFTR placement and tunnel MTU can affect performance.

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 DS-Lite IPv4 transport over IPv6 approach, the relevant caution is instead that AFTR placement and tunnel MTU can affect performance.

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 preserve routing protocol state across a supported redundant control processor switchover.

OSPF stub area constraint instead addresses a different condition: limit Type-5 external LSAs within a supported stub area. It would instead require you to configure consistent stub-area settings on all routers in the area, not the stated goal to preserve routing protocol state across a supported redundant control processor switchover.

BGP route reflection loop prevention instead addresses a different condition: stop reflected paths from looping among route reflectors. It would instead require you to use correct originator-ID and cluster-list behavior for the reflector design, not the stated goal to preserve routing protocol state across a supported redundant control processor switchover.

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 NSR control-plane failover operation: enable and verify nonstop routing on eligible platform and protocol instances.

The proposed step is for OSPF stub area constraint, whose purpose is to limit Type-5 external LSAs within a supported stub area. It would not perform the necessary NSR control-plane failover operation: enable and verify nonstop routing on eligible platform and protocol instances.

The proposed step is for BGP route reflection loop prevention, whose purpose is to stop reflected paths from looping among route reflectors. It would not perform the necessary NSR control-plane failover operation: enable and verify nonstop routing on eligible platform and protocol instances.

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 NSR control-plane failover result: adjacencies and route state survive a planned RP switchover without full reconvergence.

The observation would verify OSPF stub area constraint under the separate requirement to limit Type-5 external LSAs within a supported stub area. It does not demonstrate the needed NSR control-plane failover result: adjacencies and route state survive a planned RP switchover without full reconvergence.

The observation would verify BGP route reflection loop prevention under the separate requirement to stop reflected paths from looping among route reflectors. It does not demonstrate the needed NSR control-plane failover result: adjacencies and route state survive a planned RP switchover without full reconvergence.

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 NSR control-plane failover design in this case: only BGP graceful restart is configured and assumed identical to NSR.

This defect belongs to OSPF stub area constraint, where the affected outcome is to limit Type-5 external LSAs within a supported stub area. It is not the direct failure mode identified for the NSR control-plane failover design in this case: only BGP graceful restart is configured and assumed identical to NSR.

This defect belongs to BGP route reflection loop prevention, where the affected outcome is to stop reflected paths from looping among route reflectors. It is not the direct failure mode identified for the NSR control-plane failover design in this case: only BGP graceful restart is configured and assumed identical to NSR.

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 NSR control-plane failover approach, the relevant caution is instead that NSR requires platform and peer-specific feature support.

This concern applies to OSPF stub area constraint in a different scenario where operators need to limit Type-5 external LSAs within a supported stub area. For the deployed NSR control-plane failover approach, the relevant caution is instead that NSR requires platform and peer-specific feature support.

This concern applies to BGP route reflection loop prevention in a different scenario where operators need to stop reflected paths from looping among route reflectors. For the deployed NSR control-plane failover approach, the relevant caution is instead that NSR requires platform and peer-specific feature support.

link aggregation member continuity instead addresses a different condition: retain a provider logical link when one physical member fails. It would instead require you to build a link bundle with compatible member settings and minimum-active policy, not the stated goal to allow a neighbor's control-plane restart without immediately invalidating forwarding.

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 allow a neighbor's control-plane restart without immediately invalidating forwarding.

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 allow a neighbor's control-plane restart without immediately invalidating forwarding.

The proposed step is for link aggregation member continuity, whose purpose is to retain a provider logical link when one physical member fails. It would not perform the necessary graceful restart helper coordination operation: configure compatible graceful restart roles and bounded stale-route timers.

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 graceful restart helper coordination operation: configure compatible graceful restart roles and bounded stale-route timers.

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 graceful restart helper coordination operation: configure compatible graceful restart roles and bounded stale-route timers.

The observation would verify link aggregation member continuity under the separate requirement to retain a provider logical link when one physical member fails. It does not demonstrate the needed graceful restart helper coordination result: peer routing converges while eligible forwarding state is retained temporarily.

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 graceful restart helper coordination result: peer routing converges while eligible forwarding state is retained temporarily.

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 graceful restart helper coordination result: peer routing converges while eligible forwarding state is retained temporarily.

This defect belongs to link aggregation member continuity, where the affected outcome is to retain a provider logical link when one physical member fails. It is not the direct failure mode identified for the graceful restart helper coordination design in this case: a stale route is treated as indefinitely valid after its helper timer expires.

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 graceful restart helper coordination design in this case: a stale route is treated as indefinitely valid after its helper timer expires.

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 graceful restart helper coordination design in this case: a stale route is treated as indefinitely valid after its helper timer expires.

This concern applies to link aggregation member continuity in a different scenario where operators need to retain a provider logical link when one physical member fails. For the deployed graceful restart helper coordination approach, the relevant caution is instead that retained stale state can blackhole traffic if underlying forwarding is broken.

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 graceful restart helper coordination approach, the relevant caution is instead that retained stale state can blackhole traffic if underlying forwarding is broken.

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 graceful restart helper coordination approach, the relevant caution is instead that retained stale state can blackhole traffic if underlying forwarding is broken.