Maintenance Domain (MD) :
Management space on a network that is owned and operated by a single network provider. There is
a maintenance level (from 0 to 7) to define the hierarchical relationship between domains. Maintenance domains can be nested but
never intersect. MD is defined by Operational or Contractual Boundaries (e.g., Customer/Service Provider/Operator).
Maintenance Association (MA):
Association of Maintenance. Elements that comprise the Maintenance domain.
Maintenance Elements can either be MEPs (End points) or MIPs (Intermediate Points)
MEPs are at the edge of the network. They can generate and respond to OAM messages. A point-to-point EVC has only 2
MEPs, a multi-point EVC has multiple MEPs.
MIPs are located between the MEPs and can be used to isolate network problems. MIPs cannot generate OAM messages
but can respond.
Maintenance Level:
Identifies the network hierarchy. Higher Level = Largest network. Level information present in all OAM PDU
frames.
Level 0,1,2 = Operator domain
Level 3,4 = Service Provider domain
Level 5,6,7 = Customer domain
Some terms differ between IEEE 802.1ag and ITU Y.1731 protocols.The chart below describes the differences.
Definition Equivalencies
Maintenance Point Roles
RXT-3900 e-Manual D07-00-111P Rev A00
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