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System Management Software Configuration Guide for Cisco IE 2000U and Connected Grid Switches

Chapter 17 Configuring Ethernet OAM, CFM, and E-LMI

Information About Ethernet CFM

Figure 17-1 CFM Maintenance Domains

Figure 17-2 Allowed Domain Relationships

Maintenance Associations and Maintenance Points

A maintenance association (MA) identifies a service that can be uniquely identified within the

maintenance domain. The CFM protocol runs within a maintenance association. A maintenance point is

a demarcation point on an interface that participates in CFM within a maintenance domain. Maintenance

points drop all lower-level frames and forward all higher-level frames. There are two types of

maintenance points:

• Maintenance end points (MEPs) are points at the edge of the domain that define the boundaries and

confine CFM messages within these boundaries. Outward facing or Down MEPs communicate

through the wire side (connected to the port). Inward facing or Up MEPs communicate through the

relay function side, not the wire side.

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Operator Domains

Service Provider Domain Level 6

Operator 1

PE 1CE 1 CE 2PE 2 PE 3 PE 4

Operator 2

MEP

Level 6 Level 6

Level 4

Level 3

MEP MEP

MIP

MIP MIP

MEP MEPMIP MIP

MIP MEP

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Scenario A:

Touching Domains OK

Scenario B:

Nested Domains OK

Scenario C:

Intersecting Domains

Not Allowed

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