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IES-5000/5005/6000 Support Notes
54
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, 0-7; the wider the physical extent, the higher MD
Level number.
You can create more than one MA in one MD.
MD Levels 7 6 5 4 3 2 1 0
Customer Provider Operator
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
o An MA is a group identified by a VLAN ID.
o One MA should belong to one and only one MD group.
• MEP--Maintenance End point
o 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.
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.
CCM—Continuity Check Message
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