This object specifies the Ethernet Virtual Connection for which
the Auto-Ethernet-CFM operation will be used.
It is an unique identifier for a service instance within
a Maintenance Domain specified by ipslaEthernetGrpCtrlDomainName.
The Auto-Ethernet-CFM will find all the MEPs participating
in this Ethernet Virtual Connection and create IP SLA operations for
each MEP corresponding to value specified in
ipslaEthernetGrpCtrlRttType.
The value of this object is in effect only when the value of
ipslaEthernetGrpCtrlServiceInsType is set to 'evc'.