H3C Technologies H3C S10500 Series Switches - Manual (Page 87)

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• 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 manager switch when multiple users
trigger a data distribution on different switches at the same time.
Figure 25 Distribution process
The distribution process is as follows:
1. The manager switch obtains the status of each managed switch through an ACA request. The ACA
request carries the fabric-wide list of domain IDs (addresses of all switches in the fabric) known to
the manager switch. After sending the ACA request, the manager switch enters the locked state.
2. After receiving the ACA request, a managed switch compares its list of domain IDs with that in the
packet.
{
If they are consistent, the fabric is in stable state. In this case, the managed switch is prepared
for synchronization, replies with an ACC (acknowledgment) 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. The manager switch starts data synchronization by sending an SFC request only after receiving
ACC requests from all managed switches. Otherwise, it notifies managed switches to release the
change authorization state by sending an RCA request.