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This concern applies to Y.1731 Ethernet delay measurement in a different scenario where operators need to measure frame delay and loss across a provisioned Ethernet service. For the deployed E-LAN multipoint service approach, the relevant caution is instead that flooding scope and split-horizon controls affect scalability.

This concern applies to DSCP class marking at ingress in a different scenario where operators need to mark customer traffic into a contracted provider forwarding class before queuing. For the deployed E-LAN multipoint service approach, the relevant caution is instead that flooding scope and split-horizon controls affect scalability.

This concern applies to inter-AS VPN option B route exchange in a different scenario where operators need to exchange labeled VPN routes between autonomous systems through AS border routers. For the deployed E-LAN multipoint service approach, the relevant caution is instead that flooding scope and split-horizon controls affect scalability.

G.8032 Ethernet ring protection instead addresses a different condition: protect a Carrier Ethernet ring from forwarding loops during normal operation. It would instead require you to configure Ethernet ring protection with its ring protection link behavior, not the stated goal to allow a hub to reach remote leaves while preventing leaf-to-leaf communication.

route distinguisher VPN identity instead addresses a different condition: make otherwise identical customer prefixes unique in MP-BGP VPNv4 advertisements. It would instead require you to assign suitable unique route distinguishers to the customer VPN routes, not the stated goal to allow a hub to reach remote leaves while preventing leaf-to-leaf communication.

PIM-SSM source-specific join instead addresses a different condition: let subscribers request an explicitly selected multicast source and group pair. It would instead require you to use SSM with source-aware membership such as IGMPv3 on supported receivers, not the stated goal to allow a hub to reach remote leaves while preventing leaf-to-leaf communication.

The proposed step is for G.8032 Ethernet ring protection, whose purpose is to protect a Carrier Ethernet ring from forwarding loops during normal operation. It would not perform the necessary E-Tree root and leaf isolation operation: configure an E-Tree rooted multipoint Ethernet service with leaf restrictions.

The proposed step is for route distinguisher VPN identity, whose purpose is to make otherwise identical customer prefixes unique in MP-BGP VPNv4 advertisements. It would not perform the necessary E-Tree root and leaf isolation operation: configure an E-Tree rooted multipoint Ethernet service with leaf restrictions.

The proposed step is for PIM-SSM source-specific join, whose purpose is to let subscribers request an explicitly selected multicast source and group pair. It would not perform the necessary E-Tree root and leaf isolation operation: configure an E-Tree rooted multipoint Ethernet service with leaf restrictions.

The observation would verify G.8032 Ethernet ring protection under the separate requirement to protect a Carrier Ethernet ring from forwarding loops during normal operation. It does not demonstrate the needed E-Tree root and leaf isolation result: leaf nodes exchange frames with the root but not directly with one another.

The observation would verify route distinguisher VPN identity under the separate requirement to make otherwise identical customer prefixes unique in MP-BGP VPNv4 advertisements. It does not demonstrate the needed E-Tree root and leaf isolation result: leaf nodes exchange frames with the root but not directly with one another.

The observation would verify PIM-SSM source-specific join under the separate requirement to let subscribers request an explicitly selected multicast source and group pair. It does not demonstrate the needed E-Tree root and leaf isolation result: leaf nodes exchange frames with the root but not directly with one another.

This defect belongs to G.8032 Ethernet ring protection, where the affected outcome is to protect a Carrier Ethernet ring from forwarding loops during normal operation. It is not the direct failure mode identified for the E-Tree root and leaf isolation design in this case: an E-LAN service permits prohibited lateral leaf communication.

This defect belongs to route distinguisher VPN identity, where the affected outcome is to make otherwise identical customer prefixes unique in MP-BGP VPNv4 advertisements. It is not the direct failure mode identified for the E-Tree root and leaf isolation design in this case: an E-LAN service permits prohibited lateral leaf communication.

This defect belongs to PIM-SSM source-specific join, where the affected outcome is to let subscribers request an explicitly selected multicast source and group pair. It is not the direct failure mode identified for the E-Tree root and leaf isolation design in this case: an E-LAN service permits prohibited lateral leaf communication.

This concern applies to G.8032 Ethernet ring protection in a different scenario where operators need to protect a Carrier Ethernet ring from forwarding loops during normal operation. For the deployed E-Tree root and leaf isolation approach, the relevant caution is instead that accurate root and leaf port roles are essential for policy enforcement.

This concern applies to route distinguisher VPN identity in a different scenario where operators need to make otherwise identical customer prefixes unique in MP-BGP VPNv4 advertisements. For the deployed E-Tree root and leaf isolation approach, the relevant caution is instead that accurate root and leaf port roles are essential for policy enforcement.

This concern applies to PIM-SSM source-specific join in a different scenario where operators need to let subscribers request an explicitly selected multicast source and group pair. For the deployed E-Tree root and leaf isolation approach, the relevant caution is instead that accurate root and leaf port roles are essential for policy enforcement.

Y.1731 Ethernet delay measurement instead addresses a different condition: measure frame delay and loss across a provisioned Ethernet service. It would instead require you to enable suitable service OAM performance measurement on supported MEPs, not the stated goal to carry duplicate customer VLAN IDs from multiple subscribers over a provider Ethernet access network.

VRF customer routing isolation instead addresses a different condition: prevent two subscribers with overlapping private addresses from mixing their forwarding routes. It would instead require you to create separate VRFs and bind the correct customer interfaces to each table, not the stated goal to carry duplicate customer VLAN IDs from multiple subscribers over a provider Ethernet access network.

MPLS L3VPN label stack instead addresses a different condition: carry a VPN packet through a core that does not hold customer routes. It would instead require you to push a VPN service label beneath an appropriate transport label at the ingress PE, not the stated goal to carry duplicate customer VLAN IDs from multiple subscribers over a provider Ethernet access network.

The proposed step is for Y.1731 Ethernet delay measurement, whose purpose is to measure frame delay and loss across a provisioned Ethernet service. It would not perform the necessary 802.1ad Q-in-Q tag separation operation: push a provider service VLAN tag while preserving each customer's C-tag.

The proposed step is for VRF customer routing isolation, whose purpose is to prevent two subscribers with overlapping private addresses from mixing their forwarding routes. It would not perform the necessary 802.1ad Q-in-Q tag separation operation: push a provider service VLAN tag while preserving each customer's C-tag.

The proposed step is for MPLS L3VPN label stack, whose purpose is to carry a VPN packet through a core that does not hold customer routes. It would not perform the necessary 802.1ad Q-in-Q tag separation operation: push a provider service VLAN tag while preserving each customer's C-tag.

The observation would verify Y.1731 Ethernet delay measurement under the separate requirement to measure frame delay and loss across a provisioned Ethernet service. It does not demonstrate the needed 802.1ad Q-in-Q tag separation result: provider S-tag distinguishes the subscriber services independently of C-tag values.

The observation would verify VRF customer routing isolation under the separate requirement to prevent two subscribers with overlapping private addresses from mixing their forwarding routes. It does not demonstrate the needed 802.1ad Q-in-Q tag separation result: provider S-tag distinguishes the subscriber services independently of C-tag values.

The observation would verify MPLS L3VPN label stack under the separate requirement to carry a VPN packet through a core that does not hold customer routes. It does not demonstrate the needed 802.1ad Q-in-Q tag separation result: provider S-tag distinguishes the subscriber services independently of C-tag values.

This defect belongs to Y.1731 Ethernet delay measurement, where the affected outcome is to measure frame delay and loss across a provisioned Ethernet service. It is not the direct failure mode identified for the 802.1ad Q-in-Q tag separation design in this case: customer C-tag alone is treated as globally unique across unrelated tenants.

This defect belongs to VRF customer routing isolation, where the affected outcome is to prevent two subscribers with overlapping private addresses from mixing their forwarding routes. It is not the direct failure mode identified for the 802.1ad Q-in-Q tag separation design in this case: customer C-tag alone is treated as globally unique across unrelated tenants.

This defect belongs to MPLS L3VPN label stack, where the affected outcome is to carry a VPN packet through a core that does not hold customer routes. It is not the direct failure mode identified for the 802.1ad Q-in-Q tag separation design in this case: customer C-tag alone is treated as globally unique across unrelated tenants.

This concern applies to Y.1731 Ethernet delay measurement in a different scenario where operators need to measure frame delay and loss across a provisioned Ethernet service. For the deployed 802.1ad Q-in-Q tag separation approach, the relevant caution is instead that link MTU must allow the additional Ethernet tag bytes.

This concern applies to VRF customer routing isolation in a different scenario where operators need to prevent two subscribers with overlapping private addresses from mixing their forwarding routes. For the deployed 802.1ad Q-in-Q tag separation approach, the relevant caution is instead that link MTU must allow the additional Ethernet tag bytes.

This concern applies to MPLS L3VPN label stack in a different scenario where operators need to carry a VPN packet through a core that does not hold customer routes. For the deployed 802.1ad Q-in-Q tag separation approach, the relevant caution is instead that link MTU must allow the additional Ethernet tag bytes.