Ericsson MINI-LINK 6351 Technical Description page 23

It is possible to have multiple active EVPLAN services. The number is limited
to 16 EVCs per packet radio. The different Ethernet services can be routed
in different directions in the network.
The following functions are supported to implement EVPLAN:
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4.3.6 Maintenance Domains
A Maintenance Domain (MD) is defined as a network or sub-network, at the
Ethernet level, within which OAM frames are exchanged. An MD determines
the span of an OAM flow, across network administrative boundaries.
There are the following three types of MDs:
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MDs are hierarchal and as such, MDs of the same type do not overlap each
other, for example, two MDs of the same level do not overlap each other.
However, different MD types from different levels may overlap, for example, a
Customer MD may overlap multiple Service Provider MDs, but the Customer
MD cannot overlap another Customer MD.
An MD consists of the following components:
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Basic error checking of the Ethernet frames is performed (for example,
checking FCS, wrong Ethernet format, undersized packets or oversized
packets).
Rate limiting is used to police the ingress Ethernet traffic from the
different subscribers to make it possible to meet the agreed Service Level
Agreements (SLA).
Drop non-conforming traffic or remark them with lower priority.
Priority is used to make it possible for high priority packets to bypass low
priority packets in the buffers.
Network Operator MD
Service Provider MD
Customer MD
Maintenance Entity (ME) — An OAM entity that requires management.
Maintenance Domain (MD) — A management space on a network.
Maintenance Association (MA) — A group of MEs that belong to the same
service inside a common MD.
Maintenance End Point (MEP) — An OAM reference point that can initiate
and terminate OAM frames, and that reacts to diagnostic OAM frames.
Ethernet Functions
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