> ipv6 prefix-list test1 seq 15 permit 3ffe:8000::/20 ge 28 le 28 >From http://www.6bone.net/6bone_pTLA_list.html 28 Bit pTLA Assignments: [3FFE:8000::/24 thru 3FFE:83F0::/24] then , I presume that it should be " ipv6 prefix-list test1 seq 15 permit 3ffe:8000::/22 ge 28 le 28". Hua Ning