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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.

BGP next-hop resolution failure instead addresses a different condition: diagnose a valid BGP route absent from the forwarding RIB. It would instead require you to check recursion and IGP reachability for the advertised BGP next hop, not the stated goal to restore an IS-IS neighbor relationship failing due to mismatched interface MTUs.

IS-IS level-2 backbone exchange instead addresses a different condition: connect two IS-IS areas through a common Level-2 routing backbone. It would instead require you to form Level-2 adjacencies across area-border routers and advertise reachability, not the stated goal to restore an IS-IS neighbor relationship failing due to mismatched interface MTUs.

BGP route reflector scale instead addresses a different condition: avoid a full mesh of iBGP peer sessions across a large provider AS. It would instead require you to designate route reflectors and client sessions with suitable cluster identity, not the stated goal to restore an IS-IS neighbor relationship failing due to mismatched interface MTUs.

The proposed step is for BGP next-hop resolution failure, whose purpose is to diagnose a valid BGP route absent from the forwarding RIB. It would not perform the necessary IS-IS adjacency MTU consistency operation: align supported MTU and adjacency parameters on both connected interfaces.

The proposed step is for IS-IS level-2 backbone exchange, whose purpose is to connect two IS-IS areas through a common Level-2 routing backbone. It would not perform the necessary IS-IS adjacency MTU consistency operation: align supported MTU and adjacency parameters on both connected interfaces.

The proposed step is for BGP route reflector scale, whose purpose is to avoid a full mesh of iBGP peer sessions across a large provider AS. It would not perform the necessary IS-IS adjacency MTU consistency operation: align supported MTU and adjacency parameters on both connected interfaces.

The observation would verify BGP next-hop resolution failure under the separate requirement to diagnose a valid BGP route absent from the forwarding RIB. It does not demonstrate the needed IS-IS adjacency MTU consistency result: the adjacency reaches Up after the mismatch is corrected.

The observation would verify IS-IS level-2 backbone exchange under the separate requirement to connect two IS-IS areas through a common Level-2 routing backbone. It does not demonstrate the needed IS-IS adjacency MTU consistency result: the adjacency reaches Up after the mismatch is corrected.

The observation would verify BGP route reflector scale under the separate requirement to avoid a full mesh of iBGP peer sessions across a large provider AS. It does not demonstrate the needed IS-IS adjacency MTU consistency result: the adjacency reaches Up after the mismatch is corrected.

This defect belongs to BGP next-hop resolution failure, where the affected outcome is to diagnose a valid BGP route absent from the forwarding RIB. It is not the direct failure mode identified for the IS-IS adjacency MTU consistency design in this case: routing export policy is changed although hello padding still fails.

This defect belongs to IS-IS level-2 backbone exchange, where the affected outcome is to connect two IS-IS areas through a common Level-2 routing backbone. It is not the direct failure mode identified for the IS-IS adjacency MTU consistency design in this case: routing export policy is changed although hello padding still fails.

This defect belongs to BGP route reflector scale, where the affected outcome is to avoid a full mesh of iBGP peer sessions across a large provider AS. It is not the direct failure mode identified for the IS-IS adjacency MTU consistency design in this case: routing export policy is changed although hello padding still fails.

This concern applies to BGP next-hop resolution failure in a different scenario where operators need to diagnose a valid BGP route absent from the forwarding RIB. For the deployed IS-IS adjacency MTU consistency approach, the relevant caution is instead that an MTU increase needs to be supported across the physical path.

This concern applies to IS-IS level-2 backbone exchange in a different scenario where operators need to connect two IS-IS areas through a common Level-2 routing backbone. For the deployed IS-IS adjacency MTU consistency approach, the relevant caution is instead that an MTU increase needs to be supported across the physical path.

This concern applies to BGP route reflector scale in a different scenario where operators need to avoid a full mesh of iBGP peer sessions across a large provider AS. For the deployed IS-IS adjacency MTU consistency approach, the relevant caution is instead that an MTU increase needs to be supported across the physical path.

IS-IS single-topology coexistence instead addresses a different condition: run IPv4 and IPv6 under a common IS-IS topology when links support both. It would instead require you to configure the appropriate single-topology address-family behavior consistently, not the stated goal to recover an adjacency rejecting hello PDUs due to authentication differences.

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 recover an adjacency rejecting hello PDUs due to authentication differences.

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 recover an adjacency rejecting hello PDUs due to authentication differences.

The proposed step is for IS-IS single-topology coexistence, whose purpose is to run IPv4 and IPv6 under a common IS-IS topology when links support both. It would not perform the necessary IS-IS authentication mismatch operation: correct matching IS-IS authentication method and keys for both ends.

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 authentication mismatch operation: correct matching IS-IS authentication method and keys for both ends.

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 authentication mismatch operation: correct matching IS-IS authentication method and keys for both ends.

The observation would verify IS-IS single-topology coexistence under the separate requirement to run IPv4 and IPv6 under a common IS-IS topology when links support both. It does not demonstrate the needed IS-IS authentication mismatch result: authenticated hello exchanges establish a stable adjacency.

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 authentication mismatch result: authenticated hello exchanges establish a stable adjacency.

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 authentication mismatch result: authenticated hello exchanges establish a stable adjacency.

This defect belongs to IS-IS single-topology coexistence, where the affected outcome is to run IPv4 and IPv6 under a common IS-IS topology when links support both. It is not the direct failure mode identified for the IS-IS authentication mismatch design in this case: the IP prefix advertisement is changed with no repair to PDU authentication.

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 authentication mismatch design in this case: the IP prefix advertisement is changed with no repair to PDU authentication.

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 authentication mismatch design in this case: the IP prefix advertisement is changed with no repair to PDU authentication.

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 authentication mismatch approach, the relevant caution is instead that key rotation requires overlapping operational coordination at both peers.

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 authentication mismatch approach, the relevant caution is instead that key rotation requires overlapping operational coordination at both peers.

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 authentication mismatch approach, the relevant caution is instead that key rotation requires overlapping operational coordination at both peers.