This article explains how to upgrade the EX2300 and EX3400. It elaborates on the cleanups needed to ensure enough storage is available to perform a clean upgrade using TFTP and USB.

The Junos runtime image used on the switch is junos-arm-32-*.tgz . The current package size is ~240MB. When a new image needs to be installed on the system, it is necessary to ensure all members subjected to the upgrade have enough storage. In order to ‘unpack and install’ the image, make sure there is 1.5 times the package space after the image is pushed to the switch.

To upgrade Junos OS, copy the software package to the switch/FTP/HTTP server and use the command-line interface (CLI) to install the new software.

During a successful upgrade, the upgrade package removes all files from /var/tmp and completely re-installs the existing software. It retains configuration files and similar information such as secure shell and host keys from the previous version.

For software installation on EX2300 and EX3400 switches:

• Use the junos-arm* build for CLI upgrade.

  Example:
  junos-arm-32-15.1-20160612_15.1X53-D50_bsdx.1.tgz

• Ensure at least 600MB of disk space is available in the system before downloading the software installation package to /var/tmp . Use the command, ‘show system storage’ to get the available space.
• In the event of less available disk space, use, ‘request system storage cleanup’ and/or manually delete any other log or unwanted files (in /var/tmp, /var/log, etc.) from the system.

CLI to install a new package on the switch

• For a software package in a local directory on the switch—/var/tmp/package.tgz.
• For a software package on a remote server:
  • ftp://hostname/pathname/package.tgz
  • http://hostname/pathname/package.tgz

Where package.tgz is junos-arm-*.

Example:
junos-arm-32-15.1-20160612_15.1X53-D50_bsdx.1.tgz

fpc0:
--------------------------------------------------------------------------
Filesystem Size Used Avail Capacity Mounted on
/dev/md0.uzip 18M 18M 0B 100% /
devfs 1.0K 1.0K 0B 100% /dev
/dev/gpt/junos 1.4G 414M 909M 31% /.mount
/var/jail/etc 1.4G 414M 909M 31% /.mount/packages/mnt/jweb-ex32-f5d6f26a/jail/var/etc
/var/jail/run 1.4G 414M 909M 31% /.mount/packages/mnt/jweb-ex32-f5d6f26a/jail/var/run

/var/jail/tmp 1.4G 414M 909M 31% /.mount/packages/mnt/jweb-ex32-f5d6f26a/jail/v

Software upgrade from loader prompt (from TFTP):

1. Copy the required image on the TFTP server to the required directory.
2. Reboot the switch. Stop at uboot ( ^C or space to stop autoboot – depending on the uboot version; for older uboot -> press space)
3. Set the switch-management IP address ,netmask and gateway IP.

   Example:
   u-boot> setenv ipaddr 10.204.96.65
u-boot> setenv gatewayip 10.204.111.254
u-boot> setenv netmask 255.255.240.0
u-boot> setenv serverip 10.204.96.200
u-boot> save

4. Check connectivity to TFTP server and set the following env var:
    
   1. set bootcmd=sf probe 0; sf read $loadaddr 0x3c0000 0x10000; if imi $loadaddr; then source $loadaddr; else echo "U-Boot script corrupted!!"; fi;
   2. save
   3. Type ‘run bootmcd’ . At the option menu, type 5(More options) and then 5(Boot prompt) . The switch will drop to the loader.

• Load the build from loader.

  Example (when build is present under /tftpboot/namita/):
  install tftp://10.204.96.200/namita/builds/junos-install-media-net-ex-arm-32-15.1-20160319_sazmac_bsdx-clang.0.tgz

USB install

1. Install Junos on the EX switch using USB:

   Connect USB device to the switch:
   
   root@ex-2300:RE:0% ls -l /dev/da*
crw-r----- 1 root operator 0x4a Jul 4 07:51 /dev/da0
crw-r----- 1 root operator 0x4b Jul 4 07:51 /dev/da0p1
crw-r----- 1 root operator 0x4c Jul 4 07:51 /dev/da0p2
crw-r----- 1 root operator 0x5b Jul 4 07:52 /dev/da1 <<< USB device
crw-r----- 1 root operator 0x5c Jul 4 07:52 /dev/da1s1
crw-r----- 1 root operator 0x5d Jul 4 07:52 /dev/da1s1a

2. Copy image to USB

   Copy ‘junos-install-media-usb-arm-32-15.1X53-D50.2.img’ image to USB device using the ‘dd’ command.
   
   root@ex-2300:RE:0% gunzip junos-install-media-usb-arm-32-15.1X53-D50.2-limited.img.gz

root@ex-2300:RE:0% ls –l | grep –i usb
-rw-r--r-- 1 root wheel 331710976 Jun 11 21:06 junos-install-media-usb-arm-32-15.1X53-D50.2.img

root@ex-2300:RE:0% pwd
/root

root@ex-2300:RE:0% dd if=junos-install-media-usb-arm-32-15.1X53-D50.2.img of=/dev/da1 bs=1m
316+1 records in
316+1 records out
331710976 bytes transferred in 84.647980 secs (3918711 bytes/sec)
root@ex-2300:RE:0%

3. Reboot the EX switch:

   root@ex-2300> request system reboot

4. When the message   " Autoboot in 1 seconds... (press Ctrl-C to interrupt) " is displayed, press [Ctrl]+[C] to enter the Main Menu. 
5. From the OAM/Main Menu, select “[B]oot menu”; and then select “Boot from [U]SB” option to install USB image.

   Main Menu
   
   1. Boot [J]unos volume
   2. Boot Junos volume in [S]afe mode
   3. [R]eboot
   4. [B]oot menu
   5. [M]ore options
   
   Choice: 4
   Boot Menu
   
   1. Boot [P]revious installed Junos packages
   2. Boot Junos in [S]ingle user mode
   3. Boot from [R]ecovery snapshot
   4. Boot from [U]SB
   5. Boot to [O]AM shell
   6. Snapshot [B]oot menu
   7. [M]ain menu
   
   Choice: 4
   Attempting to boot from USB ...

6. After USB image installation is done, log in and verify that the new version of the software is properly installed.

   user@ex-2300> show version