MAC地址关于OUI字符的理解

mac地址申请很多企业会有关于OUI字符的一些理解，下面知倍客就mac地址方面的字符理解做一些阐述，希望对企业有用
MA-L分配包括超过1600万（224）个的EUI-48值。减少未使用的EUI-48的发生（例如，当受让人需要远远少于1600万EUI-48），IEEE RAC制定了以下政策用于在初次使用CID时分配MA-L，MA-M，MA-S和CID标识符介绍：
1) First-time customers (i.e., assignees) cannot purchase the MA-L. A firsttime customer that needs a 24 bit company/organization identifier can purchase a CID, and a first-time customer that needs EUI-48s or EUI-64s
(or deprecated identifiers) can purchase an MA-M or MA-S, depending on how many of each particular identifier the customer needs. Exception to this policy must be reviewed by the IEEE RAC.
2)Repeat customers (i.e., customers who have previously purchased an MA-L, MA-M, MA-S, and/or CID) can purchase any of the identifier block sizes, subject to the following restrictions:
a) The IEEE Registration Authority will accept an additional assignment
application upon the certification that at least 95% of the current MA-L or MA-M allocation of EUI-48s is used. The same applies to OUI
assignments issued prior to January 2014. An additional assignment
may be issued when a significant portion of the existing assignment of
EUI-48s has been exhausted. Customers must agree to not produce
products using the new assignment of EUI-48s until the previous
assignment is fully exhausted. This applies to all registry assignments.
b) A customer that has either an MA-L (or, prior to January 1, 2014, an OUI) or CID assignment should not need to purchase a new
CID for company identification but is eligible to purchase a new CID
for other uses, for example, when a current CID assignment provides
insufficient ELI address space.

其实mac地址使用过的时候就是12位16进制组合而成，根据前面的数字不一样可以使企业产品不会拥有一样的mac地址，这才是IEEE分配mac地址的目的。

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