H3C Technologies H3C S10500 Series Switches - Manual (Page 45)

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− The desired domain ID is not available.
{
If all available domain IDs have been assigned, the principal switch notifies the downstream
switch that no domain ID can be assigned to it.
5. After the downstream switch receives the domain ID assignment notification from the principal
switch, it works according to the following rules:
{
The downstream switch isolates its upstream principal link and brings down the relevant
interface when any of the following conditions exist:
− The downstream switch has been configured with a static domain ID different from the one
assigned by the principal switch.
− The principal switch notifies the downstream switch that no domain ID can be assigned.
For more information about domain ID types, see " Configuring a domain ID for a switch ."
{
Otherwise, the downstream switch performs the following operations:
− Accepts the domain ID assigned by the principal switch.
− Notifies the nearby downstream switch to request a domain ID from the principal switch.
6. Steps 2 through 5 are repeated until all downstream switches have been assigned domain IDs.
NOTE:
During the dynamic domain ID assignment process, if a switch receives the domain ID request on an
E_Port, the switch must record the E_Port. The link relevant to this E_Port is called the "downstream
principal link."
FC address assignment
After a switch obtains a domain ID, it can assign FC addresses to N_Ports directly connected.
The Domain_ID field in the FC address is the domain ID of the switch, and it does not need assignment.
The switch assigns an FC address according to the following rules:
• If you bind the WWN of an N_Port to an FC address, the switch assigns the bound FC address to
the N_Port.
• If the N_Port itself has a desired FC address, the switch assigns the desired FC address, if available.
• The switch assigns the smallest available area ID and port ID to the N_Port when one of the
following conditions exists:
{
The N_Port itself does not have a desired FC address.
{
The desired FC address is unavailable.
Fabric building configuration task list
When you build a fabric, H3C recommends that you use the same building mode (dynamic or static) for
all switches in the fabric. Then, perform the following tasks depending on your building mode.