Prerequisites for Ethernet Data Plane Loopback
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Ethernet loopback sessions are supported only of EFPs (service instances, Ethernet flow points, EVCs).
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Dot1q tags are not configured for default and untagged EFPs.
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Ethernet loopback sessions are supported on dot1q or QinQ or untagged and default EFPs.
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Internal loopback sessions configured must be within the 1 GB reserved bandwidth.
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Internal loopback can be launched even when the physical interface port state is down.