Alcatel-Lucent 7750 SR - MA, MEP, MIP and MD Levels; Figure 23: MEP and MIP

Ethernet Connectivity Fault Management (ETH-CFM)
Page 100 7750 SR OS Services Guide
MA, MEP, MIP and MD Levels
Maintenance domain (MD) levels are used to define CFM maintenance domains, maintenance
association end points (MEPs) and maintenance domain intermediate points (MIPs)only
communicate within the same level. It is carried in the CFM PDU to inform management entities
where maintenance association (MA) the CFM PDU belongs. There are 8 levels defined. 0 is the
lowest level, 7 is the highest level. The levels are nested, not overlapping. Overlapping is not
allowed.
CFM levels include:
• MEP is an actively managed functional component, which implements CFM
functionalities.
• Maintenance association Intermediate Point (MIP) is the intermediate point between
MEPs.
• MEP and MIP perform different CFM functionalities.
Maintenance association (MA) includes a set of MEPs, each configured with the same MA-ID and
MD level, verify the integrity of a single service instance. Figure 23 depicts a high-level view of
MEPs and MIPs in a CFM-enabled network. Two MAs are displayed.
Figure 23: MEP and MIP
OSSG179
MEP1
MEP2
MIP1 MIP3
MEP3
MIP7
Bridge
Port
MIP
MEP
MIP5
MIP11
MA
MA
MIP2 MIP4 MIP6 MIP8
MIP10
MIP12
MEP1