ASR 1006 is shipping, and the only fully-redundant chassis, which supports 32k users at max without QoS profiles enabled (which is nothing). Only supports 2 x 10GE and runs IOS_XE.
ASR 9000 is not even shipping as yet, and wont have any BRAS features. It will run IOS_XR (differnt feaure set as compared to IOS, IOS_XE and IOS_XE on 10k), and will be positioned for MetroE deployments.
Required features for a BRAS platform would be subscriber scale, 10GE density, integration with open standards policy box, dynamic profile change via COPS, COPS-PR, support for RADIUS and DIAMETER, and above all; ISSU.
You'd be better off with RB, or better yet a Juniper BRAS.
Introduction: The "external-out enable" command is available for
configuration under the "router ospf process" in case of the IOS-XR
operating system. This command basically enables advertisement of
intra-area routes on the device as external routes in th...
Introduction Basic configuration for netflow Scale parameters for
netflow Netflow support Architecture Packet flow for netflow Inside the
LC CPU Netflow Cache size, maintenance and memory Sample usage Cache
Size Aging Permanent cache Characteristics Which...