HP FlexFabric 5700 Series Configuration Manual page 81

Acquire Change Authorization (ACA).
•
• Stage Fabric Configuration Update (SFC).
Update Fabric Configuration (UFC).
•
Release Change Authorization (RCA).
•
These types of packets implement locking, data synchronization, submission, and unlocking processes,
respectively. These processes ensure that only one switch is the managing switch when multiple users
trigger a data distribution on different switches at the same time.
Figure 24 Distribution process
The distribution process is as follows:
1. The managing switch sends an ACA request to each managed switch to lock the fabric and enters
the locked state. The ACA request contains a list of domain IDs known to the managing switch.
2. A managed switch compares the list of domain IDs with those it knows.
If the list of domain IDs is the same as those known to the managed switch, the fabric is in stable
state. In this case, the managed switch replies with an ACC (Accept) packet and enters the
change authorization (locked) state.
IMPORTANT:
For a fabric to be stable, make sure the routes are correctly and consistently configured, and no
unreachable routes exist.
If the managed switch has been in change authorization state or cannot process the ACA
request, it replies with an RJT (Reject) packet.
3. After receiving ACC packets from all managed switches, the managing switch sends an SFC
request to each managed switch.
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