Default Port Speed

When auto-negotiation is enabled, the port speed used is determined by the fastest compatible speed between linked ports. On ports capable of multiple speeds, if auto-negotiation is not enabled, the default port speed setting provides for the configuring of a default speed for this port. Use the set port speed command to specify the default speed for the specified ports. Valid values are 10, 100, 1000, 10000, and 40000 Mbps on the S- and K-Series. Valid values are 1000, 10000, and 40000 Mbps on the 7100-Series.

On the 7100-Series when a 40GB QSFP fiber MAU is present, the system cannot determine from the QSFP cabling whether the mode should be set to 1x40GB mode or 4x10GB mode. The port defaults to 1x40GB mode. To set 4x10GB mode, enter set port speed port-string 10000. Use the 40GB fg.x.y designation for the port-string. The port will move to a down state and remain down until the system is reset. After the system reset, the port will come back up as four 10GB ports using the port-string format tg.x.y.

To set the 4x10GB mode back to 1x40GB mode on 7100-Series device, enter the command set port speed port-string 40000 specifying one of the 10GB ports. The four 10GB ports will move to a down state and remain down until the system is reset. After the system reset, the port will come back up as a single 40GB port using the port-string format fg.x.y.

Auto-negotiation is enabled by default.

The following S- or K-Series example sets the default speed on port ge.1.1 to 100 Mbps:

S-K-Series(rw)->set port speed ge.1.1 100
S-K-Series(rw)->show port speed ge.1.1

default speed is 100 on port ge.1.1.

S-K-Series(rw)->

The following 7100-Series example sets the default speed on port tg.1.1 to 1000 Mbps:

71000-Series(rw)->set port speed tg.1.1 1000
71000-Series(rw)->show port speed tg.1.1

default speed is 1000 on port tg.1.1.

71000-Series(rw)->