H3C Technologies H3C S5830V2 Series Switches - Manual (Page 53)

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{
If the downstream switch does not request a desired domain ID or the desired domain ID is not
available, the principal switch assigns the smallest available domain ID to the downstream
switch.
{
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 following these rules:
{
The downstream switch isolates its upstream principal link and brings down the relevant
interface when any of the following conditions is true:
− The downstream switch has been configured with a static domain ID and the static domain
ID is 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 accepts the domain ID assigned by the principal switch and
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 following these guidelines:
• 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.
• If the N_Port itself does not have a desired FC address or the desired FC address is unavailable, the
switch assigns the smallest available Area_ID and Port_ID to the N_Port.
Fabric setup configuration task list
H3C recommends that you use the dynamic mode for large networks to facilitate centralized
management and use the static mode for small networks to avoid network flapping.
Building a fabric statically
Tasks at a glance Remarks
(Required.) Enabling or disabling the fabric configuration
function
To statically build a fabric, you must
disable the fabric configuration function.