发现用户MAC地址多出两位是为什么？

<WX6103E>dis dhcp server ip-in-use  pool  netb

IP address       Client identifier/    Lease expiration      Type

                 Hardware address

192.168.55.1     01c4-f081-e8dd-d5     Feb 23 15:45:18 2019  Auto(C)           

192.168.55.2     01d4-67d3-572a-f9     Feb 23 15:40:42 2019  Auto(C)           

192.168.55.3     01bc-a920-8a31-e9     Feb 23 16:01:05 2019  Auto(C)           

192.168.55.4     18e2-9f88-88a0        Feb 23 15:40:48 2019  Auto(C)           

192.168.55.7     01b0-ca68-e0e8-8d     Feb 23 15:47:30 2019  Auto(C)           

192.168.55.8     011c-ddea-7c7f-11     Feb 23 16:04:24 2019  Auto(C)           

192.168.55.9     d497-0b7e-dbd5        Feb 23 15:50:55 2019  Auto(C)           

192.168.55.10    0174-ac5f-ed3f-76     Feb 23 15:42:34 2019  Auto(C)           

192.168.55.12    0178-36cc-db7c-d1     Feb 23 16:06:09 2019  Auto(C)           

192.168.55.13    012c-a9f0-3bb5-8f     Feb 23 15:56:39 2019  Auto(C)           

192.168.55.14    0194-d029-d18d-8b     Feb 23 16:04:08 2019  Auto(C)           

192.168.55.16    0118-d717-dcc0-77     Feb 23 15:54:09 2019  Auto(C)           

192.168.55.17    7078-8b3b-b094        Feb 23 16:06:00 2019  Auto(C)           

192.168.55.18    01d4-67d3-13b7-91     Feb 23 16:06:13 2019  Auto(C)           

192.168.55.19    3478-d7d1-983b        Feb 23 16:00:51 2019  Auto(C)     

相关案例只是说明v5和v7的区别但是我都是v7的，请给出一个原因解释，是否和终端有关

http://kms2.h3c.com/View.aspx?id=49730