The configuration revision of the OAM peer as reflected in
the latest OAMPDU. This attribute is changed by the peer
whenever it has a local configuration change for Ethernet OAM
this interface. The configuration revision can be determined
from the Revision field of the Local Information TLV of the
most recently received Information OAMPDU with a Local
Information TLV. A value of zero is returned if no Local
Information TLV has been received.