4
Replacing an MPU
MPUs are hot swappable. Before you remove an MPU installed with a storage medium on an
operating router, use the umount command to unmount the file system and wait until
displays a message that the file system has been unmounted.
Do not perform any active/standby MPU switchover operations when the system LED on an MPU
flashes yellow and green alternatively.
Replacing an MPU from an MSR5620
The MPU-60 is available for the MSR5620 router.
To replace an MPU-60 from an MSR5620 router:
1. Execute the umount sdb0: command in user view to unmount the file system and wait until the
system displays a message that the file system has been unmounted.
If no external Micro SD card is installed on the MPU or the router is powered off, skip this step.
2. Use a Phillips screwdriver to loosen the captive screws on the MPU until the spring pressure is
released.
3. Gently pull the MPU out of the slot along the guide rails.
4. Install a new MPU. For the installation procedure, see "Installing the router."
Figure 5 Removing the MPU-60
Replacing an MPU from an MSR 56-60/80 router
Before you remove an MPU-100 on an operating router, unmount the file systems
the system outputs a message that the file systems have been unmounted.
If no external CF card is installed on the MPU, execute the umount cfa0: command to unmount the
system.
If an external CF card is installed on the MPU, execute the umount cfa0: and umount cfb0:
commands to unmount the file systems.
Before you remove an MPU-100-X1 on an operating router, unmount the file systems and wait
until the system outputs a message that the file systems have been unmounted.
If no external Micro SD card is installed on the MPU, execute the umount sdb0: command to
the file system.
If an external Micro SD card is installed on the MPU, execute the umount sda0: and umount sdb0:
commands to unmount the file systems.