[Output Only] The current state of this attachment's functionality.
Enum values ACTIVE and UNPROVISIONED are shared by
DEDICATED/PRIVATE, PARTNER, and PARTNER_PROVIDER interconnect
attachments, while enum values PENDING_PARTNER,
PARTNER_REQUEST_RECEIVED, and PENDING_CUSTOMER are used for only
PARTNER and PARTNER_PROVIDER interconnect attachments. This state
can take one of the following values:
ACTIVE: The attachment has been turned up and is ready to use.
UNPROVISIONED: The attachment is not ready to use yet, because
turnup is not complete.
PENDING_PARTNER: A newly-created PARTNER attachment that has not
yet been configured on the Partner side.
PARTNER_REQUEST_RECEIVED: A PARTNER attachment is in the process
of provisioning after a PARTNER_PROVIDER attachment was created
that references it.
PENDING_CUSTOMER: A PARTNER or PARTNER_PROVIDER attachment that
is waiting for a customer to activate it.
DEFUNCT: The attachment was deleted externally and is no longer
functional. This could be because the associated Interconnect was
removed, or because the other side of a Partner attachment was
deleted.