Cisco ASR 9000 Series System Configuration Manual page 26

Layer 2 Fabric Network Architecture
CFM is mandatory in the case of Layer 2 Fabric Network Architecture to ensure that link failure detection
Note
is fast.
Figure 5: Layer 2 Fabric Satellite Network Architecture with dual host
Figure 6: Layer 2 Fabric Single Home (SH) with Single Physical ICL on Host and Satellite
Figure 7: DH : Single physical ICLs on hosts and Multiple physical ICLs on satellite
Cisco ASR 9000 Series Aggregation Services Router nV System Configuration Guide, Release 5.3.x
16
Configuring the Satellite Network Virtualization (nV) System