[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.