3.2. Global ID

3.2. Global ID

The allocation of Global IDs is pseudo-random [RANDOM]. They MUST NOT be assigned sequentially or with well-known numbers. This is to ensure that there is not any relationship between allocations and to help clarify that these prefixes are not intended to be routed globally. Specifically, these prefixes are not designed to aggregate.

This document defines a specific local method to allocate Global IDs, indicated by setting the L bit to 1. Another method, indicated by clearing the L bit, may be defined later. Apart from the allocation method, all Local IPv6 addresses behave and are treated identically.

The local assignments are self-generated and do not need any central coordination or assignment, but have an extremely high probability of being unique.

See 3.2.1. Locally Assigned Global IDs, 3.2.2. Sample Code for Pseudo-Random Global ID Algorithm, and 3.2.3. Analysis of the Uniqueness of Global IDs.