IEEE 802.1ag - Definitions

Definitions

The document defines various terms:

Maintenance Domain (MD)
Maintenance Domains are management space on a network, typically owned and operated by a single entity. MDs are configured with Names and Levels, where the eight levels range from 0 to 7. A hierarchical relationship exists between domains based on levels. The larger the domain, the higher the level value. Recommended values of levels are as follows:
  • Customer Domain: Largest (e.g., 7)
  • Provider Domain: In between (e.g., 3)
  • Operator Domain: Smallest (e.g., 1)
Maintenance Association (MA)
Defined as a "set of MEPs, all of which are configured with the same MAID (Maintenance Association Identifier) and MD Level, each of which is configured with a MEPID unique within that MAID and MD Level, and all of which are configured with the complete list of MEPIDs.”
Maintenance End Point (MEP)
Points at the edge of the domain, define the boundary for the domain. A MEP sends and receives CFM frames through the relay function, drops all CFM frames of its level or lower that come from the wire side.
Maintenance Intermediate Point (MIP)
Points internal to a domain, not at the boundary. CFM frames received from MEPs and other MIPs are cataloged and forwarded, all CFM frames at a lower level are stopped and dropped. MIPs are passive points, respond only when triggered by CFM trace route and loop-back messages.

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