If the link type specified by cItpSpLinkType is 'sctpIp',
this is the association identifier defined in the
Stream Control Transmission Protocol(SCTP) MIB.
Where value greater than zero indicates
a valid association and zero one indicates an
invalid association. This value will always be set to
zero one when cItpSpLinkType is not equal to the
'sctpIp' value.