Brocade Fabric OS Administrators Guide (Supporting Fabric OS v7.3.0) - Manual (Page 423)

1. Disable the ports on both the ends of the link.
2. Run the portCfgdport -- enable command on both ends of the link.
3. Enable the ports on both the end of the link.
The following figure illustrates an example D_Port connection between a pair of switches through SFP
transceivers (port assignments will vary). For all topologies supported, refer to
Supported topologies on
page 426.
FIGURE 55 Example of a basic D_Port connection between switches
Once the ports are configured and enabled as D_Ports, the following basic test suite is executed in the
following order, depending on the SFPs installed:
1. Electrical loopback (with 16 Gbps SFP+ only)
2. Optical loopback (with 16 Gbps SFP+ only)
3. Link traffic (with 10 Gbps SFPs, 16 Gbps SFP+, and QSFP+)
4. Link latency and distance measurement (with 10 Gbps SFPs, 16 Gbps SFP+, and QSFP+)
NOTE
Electrical and optical loopback tests are not supported on QSFP/QSFP+ FC16-64 ports and ICLs.
The following steps are the fundamental parts of D_Port testing:
1. The user configures the desired ports on both ends of the connection.
2. Once both sides are configured, a basic test suite is initiated automatically when the link comes
online, conducting diagnostic tests in the following order:
a. electrical loopback
b. optical loopback
c. link traffic
d. link latency and distance measurement.
3. After the automatic test is complete, the user can view results through the CLI or a GUI and rectify
issues (if any) that are reported.
4. The user can also start (and restart) the test manually to verify the link.
Advantages of D_Port
Use the D_Port tests for the following situations:
• Testing a new link before adding it to the fabric
• Testing a trunk member before joining it with the trunk
• Testing long-distance cables and SFP transceivers
Advantages of D_Port
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