Hello Michael,
it says:
>>>The following PBTS functions are supported only on the Cisco XR 12000 Series Router:
â¢L2VPN preferred path selection lets traffic be directed to a particular TE tunnel.
â¢Both Interior Gateway Protocol (IGP) and Label Distribution Protocol (LDP) paths are used as the default path for all traffic that belongs to a class that is not configured on the TE tunnels.
â¢According to the quality-of-service (QoS) policy, tunnel selection is based on the outgoing experimental (EXP) value and the remarked EXP value.
â¢IPv6 traffic for both 6VPE and 6PE scenarios are supported.
My understanding is that the feature is not supported on CRS-1
Hope to help
Giuseppe