Cisco ASR 9000 Series System Configuration Manual page 145

Configuring the nV Edge System on the Cisco ASR 9000 Series Router
Overview of Cisco ASR 9000 nV Edge Architecture
As a result, you can double the bandwidth capacity of single nodes and eliminate the need for complex
protocol-based high-availability schemes. Hence, you can achieve fail over times of less than 50 milliseconds
for even the most demanding services and scalability needs.
Figure 19: Cisco ASR 9000 nV Edge Architecture
In Cisco IOS XR Software Release 4.2.x, the scalability of nV Edge System is limited to two chassis.
Note
Cisco ASR 9000 Series Aggregation Services Router nV System Configuration Guide, Release 5.3.x
135