One small addition to Sergey answer:
You also have to set wsrep_cluster_address with port like this (with port number and without braces)
wsrep_cluster_address="gcomm://2b02:4c3:0:1126::1:8a:4567,2b02:4c3:0:1126::1:10:4567,2b02:4c3:0:1126::1:45:4567"
One small addition to Sergey answer:
You also have to set wsrep_cluster_ address with port like this (with port number and without braces)
wsrep_cluster_ address= "gcomm: //2b02: 4c3:0:1126: :1:8a:4567, 2b02:4c3: 0:1126: :1:10:4567, 2b02:4c3: 0:1126: :1:45:4567"