Cisco IOS XRv 9000 appliance
IOS XRv 9000 (aka Sunstone) is the 1st VM released running the 64-bit IOS XR operating system as used on the NCS-6xxx platform. This appliance requires 4 vCPUs and 16GB of memory to run!
More informations on http://virl.cisco.com/
Default username/password: admin/admin, cisco/cisco and lab/lab. There is no default configuration present.
RAM: 16384 MB
You need KVM enable on your machine or in the GNS3 VM.
Documentation for using the appliance is available on http://www.cisco.com/c/en/us/td/docs/ios_xr_sw/ios_xrv/release/notes/xrv-rn.html