rfc2578 によると、SNMPのOIDには以下の規定がある。
- サブID(※)は正数
- サブIDの個数は128個まで
- サブIDの最大値は 2^32-1 (4294967295)
- 少なくても2個のサブIDを持つ
- 最初のサブIDは 0 or 1 or 2
(※)サブIDとは、OIDを構成する各数値のこと。
An OBJECT IDENTIFIER value is an ordered list of non-negative
numbers. For the SMIv2, each number in the list is referred to as a
sub-identifier, there are at most 128 sub-identifiers in a value, and
each sub-identifier has a maximum value of 2^32-1 (4294967295
decimal).All OBJECT IDENTIFIER values have at least two sub-identifiers, where
the value of the first sub-identifier is one of the following well-
known names:Value Name
0 ccitt
1 iso
2 joint-iso-ccitt(Note that this SMI does not recognize "new" well-known names, e.g.,
as defined when the CCITT became the ITU.)
RFC 2578 - Structure of Management Information Version 2 (SMIv2)
の「3.5. OBJECT IDENTIFIER values」より抜粋。
