Technical Documentation

Troubleshooting Disabled or Down Interfaces

This topic provides troubleshooting information for specific problems related to interfaces.

Disabled port on EX 3200 switch with an SFP uplink module installed

Problem

One of the last four built-in ports (ge-0/0/20 through ge-0/0/23 on 24 port models or ge-0/0/44 through ge-0/0/47 on 48 port models) of an EX 3200 switch is disabled.

The SFP uplink module is installed and a transceiver is inserted in the uplink module.

When you check status with the show interfaces command or with the J-Web user interface, the disabled port is not listed.

Cause

The last four built-in ports use the same ASIC as the SFP uplink module. Therefore, if you insert a transceiver in an SFP uplink module installed in an EX 3200 switch, a corresponding base port from the last four built-in ports is disabled.

Solution

If you need to use the disabled built-in port, you should remove the transceiver from the SFP uplink module. You can install the XFP uplink module instead. There is no ASIC conflict with the XFP uplink module.

Disabled port on EX 3200 switch with an SFP+ uplink module installed

Problem

One of the last four built-in ports (ge-0/0/20 through ge-0/0/23 on 24 port models or ge-0/0/44 through ge-0/0/47 on 48 port models) of an EX 3200 switch is disabled.

The SFP+ uplink module is installed, it is configured to operate in 1-gigabit mode, and a transceiver is inserted in the uplink module.

When you check status with the show interfaces command or with the J-Web user interface, the disabled port is not listed.

Cause

The last four built-in ports use the same ASIC as the SFP+ uplink module. Therefore, if you insert a transceiver in an SFP+ uplink module installed in an EX 3200 switch and configured to operate in 1-gigabit mode, a corresponding base port from the last four built-in ports is disabled.

Solution

If you need to use the disabled built-in port, you should remove the transceiver from the SFP+ uplink module. You can install the XFP uplink module instead. There is no ASIC conflict with the XFP uplink module.

Disabled port on EX 3200 or EX 4200 switch with a transceiver installed in an SFP+ uplink module

Problem

The interface is disabled after you install the SFP or SFP+ transceiver.

When you check status with the show interfaces command or with the J-Web user interface, the disabled port is not listed.

Cause

By default, the SFP+ uplink module operates in the 10-gigabit mode and supports only SFP+ transceivers. The operating mode for the module is incorrectly set.

Solution

SFP+ uplink modules can be used for either SFP+ or SFP transceivers . You configure the operating mode on the module to match the type of transceiver you want to use—for SFP+ transceivers, you configure the 10-gigabit operating mode, and for SFP transceivers, you configure the 1-gigabit operating mode. See Setting the Mode on an SFP+ Uplink Module (CLI Procedure).