Enumerated value indicating what, if anything, is to be
included in the Sender ID TLV (21.5.3) transmitted by MHFs
created by the Default Maintenance Domain. If this object
has the value sendIdDefer, Sender ID TLV transmission for
this VLAN is controlled by cdot1agDefaultMdDefIdPermission.
The value of this variable is meaningless if the values of
cdot1agDefaultMdStatus is false.