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The proposed step is for SR label stack capacity, whose purpose is to validate forwarding hardware can impose all required MPLS labels for an SR policy. It would not perform the necessary SRv6 locator algorithm 128 operation: assign an SRv6 locator to Flexible Algorithm 128 with compatible IGP configuration.

The proposed step is for LDP hello discovery timer resilience, whose purpose is to keep an LDP link adjacency stable through brief congestion without hiding real forwarding loss. It would not perform the necessary SRv6 locator algorithm 128 operation: assign an SRv6 locator to Flexible Algorithm 128 with compatible IGP configuration.

The proposed step is for CBTS tunnel service assignment, whose purpose is to steer traffic classes over traffic-engineered tunnels according to service treatment. It would not perform the necessary SRv6 locator algorithm 128 operation: assign an SRv6 locator to Flexible Algorithm 128 with compatible IGP configuration.

The observation would verify SR label stack capacity under the separate requirement to validate forwarding hardware can impose all required MPLS labels for an SR policy. It does not demonstrate the needed SRv6 locator algorithm 128 result: locator state shows the intended algorithm and algorithm-specific path reachability.

The observation would verify LDP hello discovery timer resilience under the separate requirement to keep an LDP link adjacency stable through brief congestion without hiding real forwarding loss. It does not demonstrate the needed SRv6 locator algorithm 128 result: locator state shows the intended algorithm and algorithm-specific path reachability.

The observation would verify CBTS tunnel service assignment under the separate requirement to steer traffic classes over traffic-engineered tunnels according to service treatment. It does not demonstrate the needed SRv6 locator algorithm 128 result: locator state shows the intended algorithm and algorithm-specific path reachability.

This defect belongs to SR label stack capacity, where the affected outcome is to validate forwarding hardware can impose all required MPLS labels for an SR policy. It is not the direct failure mode identified for the SRv6 locator algorithm 128 design in this case: a locator is left on algorithm 0 and assumed to select delay-aware paths.

This defect belongs to LDP hello discovery timer resilience, where the affected outcome is to keep an LDP link adjacency stable through brief congestion without hiding real forwarding loss. It is not the direct failure mode identified for the SRv6 locator algorithm 128 design in this case: a locator is left on algorithm 0 and assumed to select delay-aware paths.

This defect belongs to CBTS tunnel service assignment, where the affected outcome is to steer traffic classes over traffic-engineered tunnels according to service treatment. It is not the direct failure mode identified for the SRv6 locator algorithm 128 design in this case: a locator is left on algorithm 0 and assumed to select delay-aware paths.

SRv6 H.Encaps policy instead addresses a different condition: attach a segment routing IPv6 outer header to impose an explicit traffic-engineering path. It would instead require you to configure SRv6 encapsulation and the correct source and segment list, not the stated goal to validate forwarding hardware can impose all required MPLS labels for an SR policy.

LDP label binding verification instead addresses a different condition: check the label binding for a specific IGP destination before enabling a VPN. It would instead require you to inspect local and remote LDP bindings and installed labeled forwarding entries, not the stated goal to validate forwarding hardware can impose all required MPLS labels for an SR policy.

targeted LDP session instead addresses a different condition: maintain a directed label-distribution peer not connected by a single Ethernet hop. It would instead require you to configure the appropriate targeted LDP discovery and session authentication, not the stated goal to validate forwarding hardware can impose all required MPLS labels for an SR policy.

The proposed step is for SRv6 H.Encaps policy, whose purpose is to attach a segment routing IPv6 outer header to impose an explicit traffic-engineering path. It would not perform the necessary SR label stack capacity operation: limit the SID stack to the platform-supported maximum or use policy simplification.

The proposed step is for LDP label binding verification, whose purpose is to check the label binding for a specific IGP destination before enabling a VPN. It would not perform the necessary SR label stack capacity operation: limit the SID stack to the platform-supported maximum or use policy simplification.

The proposed step is for targeted LDP session, whose purpose is to maintain a directed label-distribution peer not connected by a single Ethernet hop. It would not perform the necessary SR label stack capacity operation: limit the SID stack to the platform-supported maximum or use policy simplification.

The observation would verify SRv6 H.Encaps policy under the separate requirement to attach a segment routing IPv6 outer header to impose an explicit traffic-engineering path. It does not demonstrate the needed SR label stack capacity result: the headend programs the entire label stack without hardware resource errors.

The observation would verify LDP label binding verification under the separate requirement to check the label binding for a specific IGP destination before enabling a VPN. It does not demonstrate the needed SR label stack capacity result: the headend programs the entire label stack without hardware resource errors.

The observation would verify targeted LDP session under the separate requirement to maintain a directed label-distribution peer not connected by a single Ethernet hop. It does not demonstrate the needed SR label stack capacity result: the headend programs the entire label stack without hardware resource errors.

This defect belongs to SRv6 H.Encaps policy, where the affected outcome is to attach a segment routing IPv6 outer header to impose an explicit traffic-engineering path. It is not the direct failure mode identified for the SR label stack capacity design in this case: an explicit SR path is configured with more imposed labels than hardware supports.

This defect belongs to LDP label binding verification, where the affected outcome is to check the label binding for a specific IGP destination before enabling a VPN. It is not the direct failure mode identified for the SR label stack capacity design in this case: an explicit SR path is configured with more imposed labels than hardware supports.

This defect belongs to targeted LDP session, where the affected outcome is to maintain a directed label-distribution peer not connected by a single Ethernet hop. It is not the direct failure mode identified for the SR label stack capacity design in this case: an explicit SR path is configured with more imposed labels than hardware supports.

SRv6 interworking gateway instead addresses a different condition: carry traffic between SRv6 and another provider service encapsulation domain. It would instead require you to deploy an interworking PE or gateway with explicit service and forwarding mappings, not the stated goal to avoid oversized packets after adding segment routing headers or labels.

MPLS-TE preemption priority instead addresses a different condition: allow higher-priority reservation requests to displace lower-priority capacity commitments. It would instead require you to configure setup and hold priorities consistently with the provider TE policy, not the stated goal to avoid oversized packets after adding segment routing headers or labels.

LDP router ID transport stability instead addresses a different condition: keep an LDP session bound to a stable routable label-switching router identity. It would instead require you to configure a reachable loopback router ID as the LDP transport endpoint, not the stated goal to avoid oversized packets after adding segment routing headers or labels.

The proposed step is for SRv6 interworking gateway, whose purpose is to carry traffic between SRv6 and another provider service encapsulation domain. It would not perform the necessary SR transit MTU planning operation: account for MPLS label or SRv6 encapsulation overhead in transport MTU design.

The proposed step is for MPLS-TE preemption priority, whose purpose is to allow higher-priority reservation requests to displace lower-priority capacity commitments. It would not perform the necessary SR transit MTU planning operation: account for MPLS label or SRv6 encapsulation overhead in transport MTU design.

The proposed step is for LDP router ID transport stability, whose purpose is to keep an LDP session bound to a stable routable label-switching router identity. It would not perform the necessary SR transit MTU planning operation: account for MPLS label or SRv6 encapsulation overhead in transport MTU design.

The observation would verify SRv6 interworking gateway under the separate requirement to carry traffic between SRv6 and another provider service encapsulation domain. It does not demonstrate the needed SR transit MTU planning result: path packets reach the egress without fragmentation or drop due to encapsulation.

The observation would verify MPLS-TE preemption priority under the separate requirement to allow higher-priority reservation requests to displace lower-priority capacity commitments. It does not demonstrate the needed SR transit MTU planning result: path packets reach the egress without fragmentation or drop due to encapsulation.

The observation would verify LDP router ID transport stability under the separate requirement to keep an LDP session bound to a stable routable label-switching router identity. It does not demonstrate the needed SR transit MTU planning result: path packets reach the egress without fragmentation or drop due to encapsulation.

This defect belongs to SRv6 interworking gateway, where the affected outcome is to carry traffic between SRv6 and another provider service encapsulation domain. It is not the direct failure mode identified for the SR transit MTU planning design in this case: customer payload MTU is kept at the link maximum with no header allowance.

This defect belongs to MPLS-TE preemption priority, where the affected outcome is to allow higher-priority reservation requests to displace lower-priority capacity commitments. It is not the direct failure mode identified for the SR transit MTU planning design in this case: customer payload MTU is kept at the link maximum with no header allowance.

This defect belongs to LDP router ID transport stability, where the affected outcome is to keep an LDP session bound to a stable routable label-switching router identity. It is not the direct failure mode identified for the SR transit MTU planning design in this case: customer payload MTU is kept at the link maximum with no header allowance.