Systems and methods are disclosed for using a global unified session identifier across data centers. When a user first accesses a data center and an initial session is created for the user in the data center, a session identifier is generated for the user session. Because the initial session is the first session created for that user, the initial session identifier is designated as the global unified session identifier for all sessions that may be created for the user in other data centers within the enterprise network. Other data centers may then map the global unified session identifiers to locally generated session identifiers for the user. Using a global unified session identifier enables various user session actions to be performed globally across the data centers, including global logout, global session termination, global session updates, and/or the like. Using a global unified session identifier also prevents the risk of collision that can occur between randomly generated numbers of different data centers.