H3C Technologies H3C S10500 Series Switches - Manual (Page 43)

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Building a fabric
Overview
A fabric transmits data for servers and disk devices. When building a fabric, you must perform the
following tasks:
• Assign a domain ID to each FCF switch in the fabric.
• Assign an FC address to each node connected to the fabric.
You can build a fabric through one of the following modes:
• Static mode—You must manually assign domain IDs to all switches in the network. Then, each
switch assigns FC addresses to the N_Ports connected to it. The static mode avoids network flapping,
but it is applicable only to simple, small-sized networks.
• Dynamic mode—A principal switch is automatically elected to assign domain IDs to all switches in
the network. Then, each switch assigns FC addresses to the N_Ports connected to it. The dynamic
mode enables centralized network management and is applicable to large-sized networks.
Figure 18 Fabric building workflows
Principal switch selection
During the dynamic fabric building process, it is the principal switch that assigns domain IDs to all
switches in the network.
The switch with the highest priority (smallest priority value) is selected as the principal switch. When
multiple switches have the same priority, the switch with the smallest WWN is selected.
The principal switch selection process is as follows:
1. When the principal switch selection starts, each switch performs the following operations:
{
Considers itself to be the principal switch.
{
Records itself in the principal switch information.
{
Starts the Principal Switch Selection Timer (PSST), which is 10 seconds.