DS-Lite support for Anycast and 6PE (IPv6 Provider Edge)

Anycast enables hosting of a DS-Lite domain on multiple service PICs by assigning the same softwire rule to two service sets that use different service interfaces. Only one PIC actively processesthe DS-Lite traffic at any time. When the currently active PIC goes down, the PIC hosting the same DS-Lite domain becomes active and takes over the processing of DS-Lite traffic.