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An LU-to-LU session is a logical connection between two LUs. Conversations between TPs occur within sessions. One conversation can use a session at a time; many conversations can reuse the same session serially.
SNAP-IX enables an LU type 6.2 to have multiple sessions (two or more concurrent sessions with different partner LUs) and parallel sessions (two or more concurrent sessions with the same partner LU).
During configuration, the System Administrator determines how many sessions a particular LU supports and whether the LU supports parallel sessions.
When both LUs attempt to allocate a conversation on the same session at the same time, one must win (the contention winner) and one must lose (the contention loser). The contention-winner LU and the contention-loser LU are determined when the session is established.
In a session, the contention-loser LU must ask permission of the contention-winner LU before allocating a conversation. The contention winner may or may not grant permission. The contention-winner LU, on the other hand, simply allocates a conversation when desired.
During configuration, the System Administrator can define modes. A mode is a set of networking characteristics. Among the characteristics the System Administrator can specify within a mode definition is the number of contention-winner and contention-loser sessions for the local LU and partner LU that use the mode. (The TP issuing the [MC_]ALLOCATE verb specifies a mode, local LU, and partner LU.)
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