Interface And Hardware Component Configuration Guide For Cisco Ncs 5500 Series Routers, Ios Xr Release - Cisco NCS 5500 Series Configuration Manual

Configuring Ethernet OAM
In CFM diagrams, the conventions are that triangles represent MEPs, pointing in the direction that the
Note
MEP sends CFM frames, and circles represent MIPs. For more information about MEPs and MIPs, see
the "Maintenance Points" section on page
Figure 2: Different CFM Maintenance Domains Across a Network
To ensure that the CFM frames for each domain do not interfere with each other, each domain is assigned a
maintenance level, between 0 and 7. Where domains are nested, as in this example, the encompassing domain
must have a higher level than the domain it encloses. In this case, the domain levels must be negotiated between
the organizations involved. The maintenance level is carried in all CFM frames that relate to that domain.
CFM maintenance domains may touch or nest, but cannot intersect. This figure illustrates the supported
structure for touching and nested domains, and the unsupported intersection of domains.
Supported CFM Maintenance Domain
S t r u c t u r e
Interface and Hardware Component Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.1.x
71.
Ethernet CFM
27