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the MD_B link on the boundary of the fault range is reduced to Device B to Device D of the three

sets of equipment; on the other hand, if the MD_B equipment is working properly, it can at least

determine the Device C there is no fault。

2 Maintenance set

In the maintenance domain, Maintenance Association (MA) can be configured according to

the requirements. Each maintenance set is a collection of maintenance points in the domain. The

maintenance set is marked by "maintenance domain name + maintenance set name"。

The maintenance set serves a VLAN, and the message sent by the maintenance point of the

maintenance has the tag of the VLAN. Meanwhile, the centralized maintenance point can receive

the message sent by the other maintenance points in the maintenance set。

3 Maintenance point

The maintenance point (Maintenance Point, MP) in port configuration, belong to a set of

maintenance, maintenance can be divided into endpoint (Maintenance Association End Point,

MEP) and the maintenance of the middle point (Maintenance Association Intermediate Point, MIP)

two。

1) Maintenance endpoint

The maintenance endpoint is identified by an integer called MEP ID, which determines the

scope and boundary of the maintenance domain. The maintenance set and maintenance domain

belonging to the maintenance endpoint determine the VLAN attribute and level of the message

sent by the maintenance endpoint。

The level of the endpoint determines the level of the message that it can handle, and the level

of the message that maintains the endpoint is the level of the endpoint of the maintenance. When

the maintenance endpoint receives a message above their level, not processed, but according to its

original path forwarding; and when the message received is less than or equal to their maintenance

endpoint level will no longer maintain the forwarding endpoint for the corresponding processing,

to ensure a low level maintenance domain message will not spread to the high level maintenance

domain。

Maintenance endpoints have directionality, which can be divided into two types: extroverted

MEP and inward MEP. The direction of the endpoint maintenance indicates the location of the

maintenance domain relative to the port。

Fig. 1-2 schematic diagram of outgoing MEP

As shown in Figure 1-2, the outgoing maintenance endpoint sends the message outward

through its port，