Notice that each device can be placed in any mode as long as the remote and local device are not both in passive mode.
Discovery Capabilities
: Capabilities advertised during discovery process
Remote Loopback:
The user can transmit a loopback command to place the remote unit into loopback mode. Every frame
received is transmitted back on the same port to ensure the quality of links during installation or troubleshooting and for fault
isolation testing.
Link Events:
Event OAM PDU is transmitted when the link error exceeds the threshold. Events may be sent once or multiple
times. In the current software release, link events are only transmitted upon user request, not based on threshold crossing.
MIB Retrieval:
Retrieves information on network devices and interfaces.
Unidirection:
Checks for unidirectional transmission.
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10.3.2 IEEE 802.1ag Definitions
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 the two protocols - 802.1ag and Y.1731. The chart below describes the differences.
Definition Equivalencies
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