One default MD can be configured on each device, that it transmits high-level CCMs and generates MIPs to reply LTR packets. MAs are classified based on different SIs. gen.

[asteroid]

Тема - сетевые технологии. Сокращения эти не могу никак расшифровать, помогите, знающие!!

[Mumma]

не знающая, но ищущая
MD Maintenance Domain
см. также CCMs, MIPs, LTR
http://www.webtorials.com/main/resource/papers/juniper/paper13/Ethernet_OAM.pdf

[asteroid]

Спасибо!!

[Mumma]

в дополнение
MAs Maintenance Associations
SIs service instances (скорее всего)
http://www.brocade.com/downloads/documents/technical_briefs/oam-best-practices.pdf

[sledopyt]

в вашем же тексте, в разделе Terms :

- MD
A maintenance domain (MD) is a network or a part of the network where CFM is performed. Devices in an MD are managed by a single ISP.

– Default MD
According to IEEE Standard 802.1ag-2007, each device can be configured with one default MD. The default MD must be of a higher level than all MDs to which MEPs configured on the local device belong. In addition, the default MD must be of the same level as the high-level MD. The default MD transmits high-level CCMs and creates MIPs to reply LTR packets.

– MA
A maintenance association (MA) is a part of an MD. An MD can be divided into one or multiple MAs. On the S2700, an MA is associated with a VLAN. Ethernet CFM checks connectivity in each MA.

– MEP
A maintenance association end point (MEP) is an edge node of an MA.
For a network device running Ethernet CFM, its MEP is called the local MEP. For the other devices in the same MA, their MEPs are called the remote maintenance association end points (RMEPs).

– MIP
A maintenance association intermediate point (MIP) is an internal node of an MA. MIPs reside on the interfaces on the S2700 and are automatically created by the S2700.