I don't deal with ASR9k normally but a quick check internally and I do see support for IPv6 address-family IPv6 transport should exist.
Best contact your Cisco SE to know of any restrictions.
IPv6 Unicast Routing on Cisco ASR 9000's A9K-SIP-700
Cisco ASR 9000's A9K-SIP-700 provides complete Internet Protocol Version 6 (IPv6) unicast capability.
do you think enable IPv6 on internet router Gateway (GSR 12410 with PRP2) having full internet route table for IPv4 and also Plus IPv6 Full internet routing table.
now the CPU utilization is around 50% with IPv4 if we enable the IPv6 how much do you expect the increae in the CPU?.
and how is the IPv6 will be handle.is it extra process in the cpu?. do you have a document to explain?.