Reference Guide

FIGURE 58 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 16/32-Gbps SFP+ and QSFP)

2. Optical loopback (with 16/32-Gbps SFP+ and QSFP)

3. Link latency, distance, and power measurement (with 8-Gbps SFPs, 10-Gbps SFPs, 16/32-Gbps SFP+ and QSFP+, G620

QSFP+)

NOTE

For loopback testing, both direct (port-to-port) optical cabling and optical loopback (by means of an optical loopback

connector) are supported. External loopback tests require a loopback connector. When non-Brocade HBAs are used, refer to

the manufacturer for supported hardware and additional testing details.

NOTE

Electrical and optical loopback tests are not supported on 8-Gbps LWL/ELWL SFPs, 10-Gbps SFPs, QSFP/QSFP+ FC16-64

ports, or ICLs.

The following steps are the fundamental parts of D_Port testing:

1. The user configures the desired ports on either end, or both ends, of the connection. (The default D_Port mode of a port is

dynamic mode. If the user configures one end as D_Port static mode, then the other end behaves as a D_Port. Alternatively, the

user can configure both ends as D_Port static mode.)

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 latency, distance, and power 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.

D_Port configuration modes and testing

A D_Port can be configured in one of three modes:

∙ Static — This explicitly configures the port as a D_Port. In this mode, the port remains a D_Port until you explicitly remove the

D_Port configuration.

Diagnostic Port

Brocade Fabric OS Administration Guide, 8.0.1

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