Installing Software on ACX Series Routers (Junos OS)

Access the Juniper Networks downloads site at https://support.juniper.net/support/downloads/.

Select your product.

In the drop-down menus, select the OS and version.

Expand the Install Media section.

In the Downloads column, click the link for the USB Install Image file.

Review and accept the End User License Agreement.

Follow the instructions on the download page to download the file and save it to the /var/tmp directory on the router.

On the router, enter the shell as the root user:

user@router> start shell user root
Password:

Decompress the Junos OS image that you downloaded to the router.

root@router:~ # gunzip /path/to/image.img.gz

For example:

root@router:~ # gunzip /var/tmp/junos-install-media-usb-acx-arm-64-24.2R1.17.img.gz

On devices where Junos OS runs as a VM over a Linux-based host (VM host), log in to the VM host shell to see the USB activity.

root@router:~ # vhclient -s
root@router-node:~#

Before inserting the USB device, list the contents of /dev/, for example:

root@router:~ # ls /dev/da*
/dev/da0 /dev/da0s1c /dev/da0s2a /dev/da0s3 /dev/da0s3e
/dev/da0s1 /dev/da0s1f /dev/da0s2c /dev/da0s3c
/dev/da0s1a /dev/da0s2 /dev/da0s2f /dev/da0s3d

root@router-node:~ # ls /dev/sd*
/dev/sda  /dev/sda1  /dev/sda2  /dev/sda3  /dev/sda4  /dev/sda5  /dev/sda6  
/dev/sdb  /dev/sdb1  /dev/sdb2  /dev/sdb3  /dev/sdb4  /dev/sdb5  /dev/sdb6

Insert the USB storage device into the USB port on the router.

Determine the device ID of the USB by using one or more of the following methods.

• Review the console messages, which should show the device ID when you insert the USB storage device. The messages and device ID can vary based on the platform, for example:

  content_copy zoom_out_map

  da2 at router-sim1 bus 1 target 0 lun 0
  da2: <TOSHIBA TransMemory 5.00> Removable Direct Access SCSI-0 device

• List the contents of /dev/ and compare it to the list of device IDs from Step 4 to identify the newly added device. The device name can vary by platform, for example:

  content_copy zoom_out_map

  root@router# ls /dev/da*
  /dev/da0 /dev/da0s1c /dev/da0s2a /dev/da0s3 /dev/da0s3e
  /dev/da0s1 /dev/da0s1f /dev/da0s2c /dev/da0s3c /dev/da2
  /dev/da0s1a /dev/da0s2 /dev/da0s2f /dev/da0s3d /dev/da2s1

  or

  content_copy zoom_out_map

  root@router-node:~# ls /dev/sd*
  /dev/sda  /dev/sda1  /dev/sda2  /dev/sda3  /dev/sda4  /dev/sda5  /dev/sda6  
  /dev/sdb  /dev/sdb1  /dev/sdb2  /dev/sdb3  /dev/sdb4  /dev/sdb5  /dev/sdb6
  /dev/sdc  /dev/sdc1

• Issue the show log messages operational mode command or the dmesg shell command to check the log files for messages related to the USB device name. For example:

  content_copy zoom_out_map

  root@router-node:~# dmesg | tail
  ...
  [  493.244240] scsi 6:0:0:0: Direct-Access     JetFlash Transcend 16GB   1100 PQ: 0 ANSI: 6
  [  493.244468] sd 6:0:0:0: Attached scsi generic sg2 type 0
  [  493.245149] sd 6:0:0:0: [sdc] 30197760 512-byte logical blocks: (15.5 GB/14.4 GiB)
  [  493.245876] sd 6:0:0:0: [sdc] Write Protect is off
  [  493.245879] sd 6:0:0:0: [sdc] Mode Sense: 43 00 00 00
  [  493.246653] sd 6:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
  [  493.251845]  sdc: sdc1
  [  493.254346] sd 6:0:0:0: [sdc] Attached SCSI removable disk  

(ACX710 only) Clear the USB storage device by writing zeroes to the device. Ensure that you specify the device ID of the USB storage device as identified in the previous steps. This process might take some time, so do not kill the session.

root@router:~# dd if=/dev/zero of=/dev/device-id bs=1m

For example, if the device ID is /dev/da2, then you would issue the following command:

root@router:~# dd if=/dev/zero of=/dev/da2 bs=1m

dd: /dev/da2: end of device
29164+0 records in
29163+0 records out
30579621888 bytes transferred in 2402.249018 secs (12729580 bytes/sec)

Use the dd command to copy the Junos OS image to the USB storage device.

root@router:~# dd if=/path/to/image.img of=/dev/device-id bs=1m

For example, the following command copies the Junos OS image from the /var/tmp directory to the USB with device ID /dev/da2.

root@router:~# dd if=/var/tmp/junos-install-media-usb-acx-arm-64-24.2R1.17.img of=/dev/da2 bs=1m

Insert the USB storage device into the USB port.

Reboot the router by doing one of the following:

• Press the power button on the chassis.

• Switch off and turn on the power button behind the Routing Engine.

• Enter the request system reboot command from the CLI.

The system LED starts blinking in green.

On the console, a message is displayed stating that your flash memory device (NAND Flash device) will be formatted and you will lose all the data. You are prompted to confirm the formatting of the flash memory device.

Press y to confirm and proceed with the formatting process. The flash memory device is formatted and the image is installed on both the partitions.

After the installation is completed, the console displays a message prompting you to eject the USB storage device and to press Enter to reboot the device.

After you remove the USB storage device and press Enter, the reboot begins. After the router reboots, the new Junos OS version is loaded and functional. The LED glows steadily in green.