Indicating the mode in which the protected VLANs of an RRPP
domain are configured. The value 'vlan' indicates that
hpnicfRrppDomainProtectVlanListLow and hpnicfRrppDomainProtectVlanListHigh
can be used for setting protected VLANs, while
hpnicfRrppDomainInstanceListLow and hpnicfRrppDomainInstanceListHigh
cannot. By contraries, the value 'instance' indicates
that 3cRrppDomainInstanceListLow and hpnicfRrppDomainInstanceListHigh
can be used for setting protected VLANs while the other two cannot.