Often there are three different organizations involved in a Metro Ethernet service: customers, service providers, and operators. Customers purchase Ethernet service from service providers. Service providers may use their own networks, or the networks of other operators to provide connectivity for the requested service. Customer themselves may be service providers, for example, a customer may be an Internet service provider that sells Internet connectivity.
CFM Terms
•MD--Maintenance Domain
An MD is a group identified by a level number.
There are 8 MD Levels,
You can create more than one MA in one MD.
MD Levels | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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A maintenance domain is an administrative domain for the purpose of managing and administering a network. A domain is assigned a unique maintenance level by the administrator, which is useful for defining the hierarchical relationship of domains. MD may nest or touch, but cannot intersect. If two domains nest, the outer domain must have a higher maintenance level than the one it involves.
•MA--Maintenance Association
oAn MA is a group identified by a VLAN ID.
oOne MA should belong to one and only one MD group.
•MEP--Maintenance End point
oAn MEP port has the ability to send and reply the CCMs, LBMs and LTMs. It also gets other MEP port information from neighbor switches’ CCMs in an MA.
An MEP port has the ability to send and reply the CCMs, LBMs and LTMs. It also gets other MEP port information from neighbor switches’ CCMs in an MA.
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