Juniper Networks 8 manual Verifying the Installation, Replacing Fan Trays

Maintaining ERX Routers

Verifying the Installation

After you have replaced the SFPs and connected the cables, issue the show interface gigabitEthernet command for each interface to make sure that the interface is operational (up).

Field descriptions

gigabitEthernet interfaceSpecifier —Status of the hardware on this interface

Up—Hardware is operational

Down—Hardware is not operational

Administrative status—Operational state that you configured for this interface

Up—Interface is enabled

Down—Interface is disabled

Example

host1:vr2#show interfaces gigabitEthernet2/0

gigabitEthernet2/0 is Up, Administrative status is Up

Replacing Fan Trays

A tray of cooling fans provides forced air cooling for components in the ERX routers. The fan trays are hot-swappable; you can replace them without powering down the system. However, if you do not replace the fan tray within approximately 2 minutes, the system enters thermal protection mode. For information about thermal protection mode, see “Monitoring Temperatures of Modules” on page 113.

You can monitor fan status by observing the LEDs on the SRP module or on the fan tray behind the faceplate. For complete LED information, see “Understanding Status LEDs to Troubleshoot” on page 104.

NOTE: On the SRP module, when the LED alternates between OK and FAIL in 10–second intervals, a non-critical fan failure exists. Noncritical warnings are not indicated on the fan tray LEDs; if the red FAN FAIL LED is illuminated, either a critical or non-critical failure exists.

CAUTION: If the red FAN FAIL LED on the SRP module is illuminated and none of the fans are spinning when you remove the fan tray, power down the system

Replacing Fan Trays 97