Services Overview
7705 SAR OS Services Guide Page 61
802.1ag and Y.1731 Terminology
Table 8 defines 802.1ag terms. Table 9 illustrates the similarities and differences between
Y.1731 and 802.1ag terms.
Table 8: 802.1ag Terminology
Term Expansion Definition
MA Maintenance Association A grouping of maintenance entities (MEs) that need to be managed as
part of a given service
Typically, on the 7705 SAR, the MEs are a pair of MEPs (one local
and one remote)
MA-ID Maintenance Association
Identifier
A unique combination of md-index, MD level and ma-index, where
md-index, level, and ma-index are user-configured values
An MA is identified by its MA-ID
MD Maintenance Domain A set of Ethernet network elements or ports that are controlled by an
operator, where boundaries are set by MEPs
MD
level
Maintenance Domain level A user-configured value of 0 to 7 representing a level of hierarchy
within a CFM architecture. The value 7 is the highest MD level and 0
is the lowest.
The MD level is transmitted as part of the Ethernet CFM frame. A
CFM message is said to have a higher MD level when its MD level
value is higher than the MD value configured on the receiving MEP
7705 SAR.
Higher-level CFM messages are relayed as data frames by MEPs and
ignored by the MEP entity
ME Maintenance Entity An Ethernet port or endpoint that is managed as part of dot1ag OAM
An endpoint can be a SAP or a spoke SDP
MEP Maintenance Association
End Point
An (edge) endpoint that can terminate, respond to, or initiate the OAM
messages for a configured MD-MA combination
MEP-ID Maintenance Association
End Point Identifier
A MEP is identified by its MEP-ID, which is a unique combination of
md-index and ma-index, where md-index and ma-index are user-
configured values
MIP Maintenance Association
Intermediate Point
An intermediate point that can respond to OAM messages initiated by
MEPs in the same MD. Connectivity fault management (CFM)
messages destined for other MIPs or the destination MEP are
transparent to MIPs.
MIPs are not supported in Release 3.0 of the 7705 SAR
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