Cisco Catalyst 4500 series Administration Manual page 1607

Chapter 66 Configuring Ethernet OAM and CFM
As shown in
by more than one entity, which is not allowed. Domains can touch or nest (if the outer domain has a
higher maintenance level than the nested domain). Nesting domains can be useful when a service
provider contracts with one or more operators to provide Ethernet service. Each operator has its own
maintenance domain and the service provider domain is a superset of the operator domains. Maintenance
levels of nesting domains should be communicated among the administrating organizations. CFM
exchanges messages and performs operations on a per-domain basis.
Figure 66-1
E 1
Level 6
Level 3
Figure 66-2
Scenario A:
Touching Domains OK
OL-28731-01
Figure 66-2, domains cannot intersect or overlap because that would require management
CFM Maintenance Domains
Operator 1
PE 1 PE 2
MEP MIP
MEP MIP MIP MEP
Allowed Domain Relationships
MIP
MEP
Scenario B:
Nested Domains OK
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
About Ethernet CFM
Operator 2
PE 3 PE 4
MEP
MIP MIP MEP
Scenario C:
Intersecting Domains
Not Allowed
CE 2
Level 6
Level 4
66-3