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This concern applies to customer edge ACL anti-spoof in a different scenario where operators need to permit only delegated customer source prefixes at a provider access boundary. For the deployed RTBH DDoS containment approach, the relevant caution is instead that blackholing sacrifices reachability to the protected address during mitigation.

This concern applies to DDoS control plane differentiation in a different scenario where operators need to distinguish volumetric customer-traffic floods from attacks on the router control plane. For the deployed RTBH DDoS containment approach, the relevant caution is instead that blackholing sacrifices reachability to the protected address during mitigation.

This concern applies to management API certificate trust in a different scenario where operators need to protect provider management APIs from accepting an untrusted endpoint. For the deployed RTBH DDoS containment approach, the relevant caution is instead that blackholing sacrifices reachability to the protected address during mitigation.

strict uRPF customer check instead addresses a different condition: block forged source addresses on a single-homed customer-facing interface. It would instead require you to enable strict source validation only where expected reverse-route interface matches ingress, not the stated goal to encrypt traffic directly across supported Ethernet links between managed devices.

customer DSCP trust boundary instead addresses a different condition: prevent a subscriber from assigning itself premium forwarding by arbitrary DSCP markings. It would instead require you to remark or police traffic at the subscriber-to-provider classification boundary, not the stated goal to encrypt traffic directly across supported Ethernet links between managed devices.

BGP FlowSpec filtering instead addresses a different condition: distribute narrowly scoped traffic-filtering rules to mitigate a specific attack flow. It would instead require you to publish and validate BGP FlowSpec NLRI through a trusted mitigation policy, not the stated goal to encrypt traffic directly across supported Ethernet links between managed devices.

The proposed step is for strict uRPF customer check, whose purpose is to block forged source addresses on a single-homed customer-facing interface. It would not perform the necessary MACsec provider handoff operation: establish MACsec connectivity associations and key management on both handoff peers.

The proposed step is for customer DSCP trust boundary, whose purpose is to prevent a subscriber from assigning itself premium forwarding by arbitrary DSCP markings. It would not perform the necessary MACsec provider handoff operation: establish MACsec connectivity associations and key management on both handoff peers.

The proposed step is for BGP FlowSpec filtering, whose purpose is to distribute narrowly scoped traffic-filtering rules to mitigate a specific attack flow. It would not perform the necessary MACsec provider handoff operation: establish MACsec connectivity associations and key management on both handoff peers.

The observation would verify strict uRPF customer check under the separate requirement to block forged source addresses on a single-homed customer-facing interface. It does not demonstrate the needed MACsec provider handoff result: secure associations are active and frames are protected across the single Ethernet hop.

The observation would verify customer DSCP trust boundary under the separate requirement to prevent a subscriber from assigning itself premium forwarding by arbitrary DSCP markings. It does not demonstrate the needed MACsec provider handoff result: secure associations are active and frames are protected across the single Ethernet hop.

The observation would verify BGP FlowSpec filtering under the separate requirement to distribute narrowly scoped traffic-filtering rules to mitigate a specific attack flow. It does not demonstrate the needed MACsec provider handoff result: secure associations are active and frames are protected across the single Ethernet hop.

This defect belongs to strict uRPF customer check, where the affected outcome is to block forged source addresses on a single-homed customer-facing interface. It is not the direct failure mode identified for the MACsec provider handoff design in this case: a generic IPsec tunnel is configured but Ethernet-link security remains absent.

This defect belongs to customer DSCP trust boundary, where the affected outcome is to prevent a subscriber from assigning itself premium forwarding by arbitrary DSCP markings. It is not the direct failure mode identified for the MACsec provider handoff design in this case: a generic IPsec tunnel is configured but Ethernet-link security remains absent.

This defect belongs to BGP FlowSpec filtering, where the affected outcome is to distribute narrowly scoped traffic-filtering rules to mitigate a specific attack flow. It is not the direct failure mode identified for the MACsec provider handoff design in this case: a generic IPsec tunnel is configured but Ethernet-link security remains absent.

This concern applies to strict uRPF customer check in a different scenario where operators need to block forged source addresses on a single-homed customer-facing interface. For the deployed MACsec provider handoff approach, the relevant caution is instead that MACsec does not encrypt a path beyond the protected adjacent Ethernet segment.

This concern applies to customer DSCP trust boundary in a different scenario where operators need to prevent a subscriber from assigning itself premium forwarding by arbitrary DSCP markings. For the deployed MACsec provider handoff approach, the relevant caution is instead that MACsec does not encrypt a path beyond the protected adjacent Ethernet segment.

This concern applies to BGP FlowSpec filtering in a different scenario where operators need to distribute narrowly scoped traffic-filtering rules to mitigate a specific attack flow. For the deployed MACsec provider handoff approach, the relevant caution is instead that MACsec does not encrypt a path beyond the protected adjacent Ethernet segment.

strict uRPF customer check instead addresses a different condition: block forged source addresses on a single-homed customer-facing interface. It would instead require you to enable strict source validation only where expected reverse-route interface matches ingress, not the stated goal to permit only delegated customer source prefixes at a provider access boundary.

routed optical convergence instead addresses a different condition: reduce layers between IP routing and transport while retaining an optical link path. It would instead require you to design routed-optical coherent optics with layer-3 routing over the provisioned optical channel, not the stated goal to permit only delegated customer source prefixes at a provider access boundary.

SRv6 core path instruction instead addresses a different condition: steer provider packets along an IPv6 segment list without MPLS label transport. It would instead require you to use an SRv6 policy with suitable locators and segment identifiers on supported devices, not the stated goal to permit only delegated customer source prefixes at a provider access boundary.

The proposed step is for strict uRPF customer check, whose purpose is to block forged source addresses on a single-homed customer-facing interface. It would not perform the necessary customer edge ACL anti-spoof operation: apply an ingress ACL matching the customer's assigned source address space.

The proposed step is for routed optical convergence, whose purpose is to reduce layers between IP routing and transport while retaining an optical link path. It would not perform the necessary customer edge ACL anti-spoof operation: apply an ingress ACL matching the customer's assigned source address space.

The proposed step is for SRv6 core path instruction, whose purpose is to steer provider packets along an IPv6 segment list without MPLS label transport. It would not perform the necessary customer edge ACL anti-spoof operation: apply an ingress ACL matching the customer's assigned source address space.

The observation would verify strict uRPF customer check under the separate requirement to block forged source addresses on a single-homed customer-facing interface. It does not demonstrate the needed customer edge ACL anti-spoof result: permitted customer sources pass and nonassigned sources are denied and counted.

The observation would verify routed optical convergence under the separate requirement to reduce layers between IP routing and transport while retaining an optical link path. It does not demonstrate the needed customer edge ACL anti-spoof result: permitted customer sources pass and nonassigned sources are denied and counted.

The observation would verify SRv6 core path instruction under the separate requirement to steer provider packets along an IPv6 segment list without MPLS label transport. It does not demonstrate the needed customer edge ACL anti-spoof result: permitted customer sources pass and nonassigned sources are denied and counted.

This defect belongs to strict uRPF customer check, where the affected outcome is to block forged source addresses on a single-homed customer-facing interface. It is not the direct failure mode identified for the customer edge ACL anti-spoof design in this case: an egress ACL is installed where it never checks inbound spoofed packets.

This defect belongs to routed optical convergence, where the affected outcome is to reduce layers between IP routing and transport while retaining an optical link path. It is not the direct failure mode identified for the customer edge ACL anti-spoof design in this case: an egress ACL is installed where it never checks inbound spoofed packets.

This defect belongs to SRv6 core path instruction, where the affected outcome is to steer provider packets along an IPv6 segment list without MPLS label transport. It is not the direct failure mode identified for the customer edge ACL anti-spoof design in this case: an egress ACL is installed where it never checks inbound spoofed packets.

This concern applies to strict uRPF customer check in a different scenario where operators need to block forged source addresses on a single-homed customer-facing interface. For the deployed customer edge ACL anti-spoof approach, the relevant caution is instead that a prefix change requires a synchronized ACL update to avoid customer outage.

This concern applies to routed optical convergence in a different scenario where operators need to reduce layers between IP routing and transport while retaining an optical link path. For the deployed customer edge ACL anti-spoof approach, the relevant caution is instead that a prefix change requires a synchronized ACL update to avoid customer outage.

This concern applies to SRv6 core path instruction in a different scenario where operators need to steer provider packets along an IPv6 segment list without MPLS label transport. For the deployed customer edge ACL anti-spoof approach, the relevant caution is instead that a prefix change requires a synchronized ACL update to avoid customer outage.