Figure 5-54 Single Management Domain - Zte ZXR10 2900E series Configuration Manual

Figure 5-54 Single Management Domain

In the domain in
devices.
l
The grey ports on the peripheral devices are service ports connected to the external
devices and therefore are named Maintenance association End Point (MEP).
l The other black ports (including those on intermediate devices) connect internal
devices and therefore are named Maintenance Domain Intermediate Point (MIP).
The management function is implemented through the defined MEP and MIP.
A network is divided into a customer domain, provider domain, and operator domain.
A level between 0-7 is designated for each domain. The domain level determines the
inclusion relation between domains. A domain with a higher level can include domains
with lower levels but not vice versa. The domains with the same level cannot include each
other. This means that all domains can be tangential (internally or externally) and inclusive
but cannot be intersecting.
The message types defined in the CFM protocol include:
l
Continuity Check Message (CCM): A multicast CFM protocol data unit.
periodically sent by an MEP to confirm the connectivity of MEP in the same MA. An
MEP receiving a CCM message does not reply to this message.
l
Link Trace Message (LTM): A multicast CFM protocol data unit. It is sent by an MEP
to trace the path from the MEP to the MP. Each MP along the path generates an LRT
as a response. This ends until the message reaches the destination or cannot be
further forwarded.
l
Link Trace Reply (LTR): A unicast CFM protocol data unit. It is sent by the MP receiving
an LTM to reply to the LTM.
SJ-20130731155059-002|2013-11-27 (R1.0)
Figure 5-54, a series of ports are defined on peripheral and internal
5-149
Chapter 5 Service Configuration
ZTE Proprietary and Confidential
It is