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This concern applies to IS-IS single-topology coexistence in a different scenario where operators need to run IPv4 and IPv6 under a common IS-IS topology when links support both. For the deployed IS-IS level-2 backbone exchange approach, the relevant caution is instead that inter-area reachability depends on continuous Level-2 connectivity.

This concern applies to OSPF designated router election in a different scenario where operators need to reduce adjacency overhead on a shared broadcast Ethernet segment. For the deployed IS-IS level-2 backbone exchange approach, the relevant caution is instead that inter-area reachability depends on continuous Level-2 connectivity.

This concern applies to RPL inbound AS-path policy in a different scenario where operators need to reject untrusted routes with prohibited AS-path characteristics. For the deployed IS-IS level-2 backbone exchange approach, the relevant caution is instead that inter-area reachability depends on continuous Level-2 connectivity.

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 ensure two routers in the same IS-IS domain have distinct system identifiers.

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 ensure two routers in the same IS-IS domain have distinct system identifiers.

BGP next-hop-self internal reachability instead addresses a different condition: repair iBGP route reception when the external next hop cannot be resolved internally. It would instead require you to set the correct next-hop attribute on the iBGP advertisement boundary, not the stated goal to ensure two routers in the same IS-IS domain have distinct system identifiers.

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 NET system identity operation: assign each instance a unique six-octet system ID in its network entity title.

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 NET system identity operation: assign each instance a unique six-octet system ID in its network entity title.

The proposed step is for BGP next-hop-self internal reachability, whose purpose is to repair iBGP route reception when the external next hop cannot be resolved internally. It would not perform the necessary IS-IS NET system identity operation: assign each instance a unique six-octet system ID in its network entity title.

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 NET system identity result: adjacency and database output show separate stable system identities.

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 NET system identity result: adjacency and database output show separate stable system identities.

The observation would verify BGP next-hop-self internal reachability under the separate requirement to repair iBGP route reception when the external next hop cannot be resolved internally. It does not demonstrate the needed IS-IS NET system identity result: adjacency and database output show separate stable system identities.

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 NET system identity design in this case: two routers reuse the identical NET system ID and topology records collide.

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 NET system identity design in this case: two routers reuse the identical NET system ID and topology records collide.

This defect belongs to BGP next-hop-self internal reachability, where the affected outcome is to repair iBGP route reception when the external next hop cannot be resolved internally. It is not the direct failure mode identified for the IS-IS NET system identity design in this case: two routers reuse the identical NET system ID and topology records collide.

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 NET system identity approach, the relevant caution is instead that multiple NET area addresses on one router must keep its system ID consistent.

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 NET system identity approach, the relevant caution is instead that multiple NET area addresses on one router must keep its system ID consistent.

This concern applies to BGP next-hop-self internal reachability in a different scenario where operators need to repair iBGP route reception when the external next hop cannot be resolved internally. For the deployed IS-IS NET system identity approach, the relevant caution is instead that multiple NET area addresses on one router must keep its system ID consistent.

IS-IS conditional default route instead addresses a different condition: advertise a default route only under a defined service-availability condition. It would instead require you to apply default-origination with a route policy matching the required upstream state, not the stated goal to advertise IPv6 links whose topology differs from the IPv4 forwarding graph.

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 advertise IPv6 links whose topology differs from the IPv4 forwarding graph.

OSPF external metric distinction instead addresses a different condition: choose between internal-cost-aware and fixed-external-cost path treatment. It would instead require you to apply the required OSPF external metric type under the redistribution policy, not the stated goal to advertise IPv6 links whose topology differs from the IPv4 forwarding graph.

The proposed step is for IS-IS conditional default route, whose purpose is to advertise a default route only under a defined service-availability condition. It would not perform the necessary IS-IS IPv6 multitopology operation: enable the supported multitopology IS-IS IPv6 address-family behavior.

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 IPv6 multitopology operation: enable the supported multitopology IS-IS IPv6 address-family behavior.

The proposed step is for OSPF external metric distinction, whose purpose is to choose between internal-cost-aware and fixed-external-cost path treatment. It would not perform the necessary IS-IS IPv6 multitopology operation: enable the supported multitopology IS-IS IPv6 address-family behavior.

The observation would verify IS-IS conditional default route under the separate requirement to advertise a default route only under a defined service-availability condition. It does not demonstrate the needed IS-IS IPv6 multitopology result: IPv6 SPF sees its own valid link participation and reachability.

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 IPv6 multitopology result: IPv6 SPF sees its own valid link participation and reachability.

The observation would verify OSPF external metric distinction under the separate requirement to choose between internal-cost-aware and fixed-external-cost path treatment. It does not demonstrate the needed IS-IS IPv6 multitopology result: IPv6 SPF sees its own valid link participation and reachability.

This defect belongs to IS-IS conditional default route, where the affected outcome is to advertise a default route only under a defined service-availability condition. It is not the direct failure mode identified for the IS-IS IPv6 multitopology design in this case: single-topology IPv6 is forced through a link lacking IPv6 support.

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 IPv6 multitopology design in this case: single-topology IPv6 is forced through a link lacking IPv6 support.

This defect belongs to OSPF external metric distinction, where the affected outcome is to choose between internal-cost-aware and fixed-external-cost path treatment. It is not the direct failure mode identified for the IS-IS IPv6 multitopology design in this case: single-topology IPv6 is forced through a link lacking IPv6 support.

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.