What Entities Make Up A Maintenance Domain - Dell PowerEdge M420 Configuration Manual

Dell powerconnect m8024-k user's configuration guide

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Higher levels have a broader, but less detailed, view of the network. As a

result, a provider could include multiple operators, provided that the domains

never intersect. The operator transparently passes frames from the customer

and provider, and the customer does not see the operator frames. Multiple

levels within a domain (say, operator) are supported for flexibility.

What Entities Make Up a Maintenance Domain?

Dot1ag defines three primary entities that make up the maintenance domain:

Maintenance End Points (MEPs), Maintenance Intermediate Points (MIPs),

and Maintenance Associations (MAs).

MEPs, and MIPs

MEPs and MIPs are software or sometimes hardware per-service entities

where CFM functionalities are present.

MEPs define the boundary of a maintenance domain. They initiate and

respond to CFM messages. MEPs prevent the leaking of CFM messages

between domains (for example, among operators or between operators and

customers). Each MEP has a configurable unique identifier (MEPID) in a

maintenance domain.

MEPs periodically issue Continuity Check Messages (CCM) to discover

each other and issue SNMP traps to report connectivity losses or

malformed or incorrect CCMs.

A MEP can be defined as "down MEP" or an "up MEP". A down MEPs

reside in a bridge that transmits CFM PDUs towards, and receives them

from, the direction of the LAN. An up MEP resides in a bridge that

transmits CFM PDUs towards, and receives them from, the direction of

the Bridge Relay Entity.

connectivity and other services to systems outside the domain is referred to

as a Domain Service Access Point (DoSAP). A MEP is a type of DoSAP

whose services relate to connectivity fault management.

MIPs are entities within a domain that enable the outer domain to achieve

end-to-end connectivity checks. MIPs passively receive CFM messages and

respond back to the originating MEP.

An entity at the boundary of maintenance domain that offers

Configuring Connectivity Fault Management