Verifying Junos OS and Boot Loader Software Versions on an EX Series Switch
Before or after upgrading or downgrading Junos OS, you might need to verify the Junos OS version. You might also need to verify the boot loader software version if you are upgrading to or downgrading from a release that supports resilient dual-root partitions (Junos OS Release 10.4R3 and later).
This topic includes:
Verifying the Number of Partitions and File System Mountings
Purpose
Between Junos OS Release 10.4R2 and Release 10.4R3, upgrades were made to further increase resiliency of root partitions, which required reformatting the disk from three partitions to four partitions. If your switch is running Release 10.4R2 or earlier, it has three partitions, and if it is running Release 10.4R3 or later, it has four partitions.
Action
Verify how many partitions the disk has, as well as where each file system is mounted, by using the following command:
user@switch> show system storage fpc0: ----------------------------------------------------------------------- Filesystem Size Used Avail Capacity Mounted on /dev/da0s1a 184M 124M 45M 73% / devfs 1.0K 1.0K 0B 100% /dev /dev/md0 37M 37M 0B 100% /packages/mnt/jbase /dev/md1 18M 18M 0B 100% /packages/mnt/jcrypto-ex-10.4I20110121_0509_hbRPSRLI15184421081 /dev/md2 6.1M 6.1M 0B 100% /packages/mnt/jdocs-ex-10.4I20110121_0509_hbRPSRLI15184421081 /dev/md3 154M 154M 0B 100% /packages/mnt/jkernel-ex-10.4I20110121_0509_hbRPSRLI15184421081 /dev/md4 23M 23M 0B 100% /packages/mnt/jpfe-ex42x-10.4I20110121_0509_hbRPSRLI15184421081 /dev/md5 46M 46M 0B 100% /packages/mnt/jroute-ex-10.4I20110121_0509_hbRPSRLI15184421081 /dev/md6 28M 28M 0B 100% /packages/mnt/jswitch-ex-10.4I20110121_0509_hbRPSRLI15184421081 /dev/md7 22M 22M 0B 100% /packages/mnt/jweb-ex-10.4I20110121_0509_hbRPSRLI15184421081 /dev/md8 126M 10.0K 116M 0% /tmp /dev/da0s3e 123M 632K 112M 1% /var /dev/da0s3d 369M 20K 339M 0% /var/tmp /dev/da0s4d 62M 62K 57M 0% /config /dev/md9 118M 12M 96M 11% /var/rundb procfs 4.0K 4.0K 0B 100% /proc /var/jail/etc 123M 632K 112M 1% /packages/mnt/jweb-ex-10.4I20110121_0509_hbRPSRLI15184421081/jail/var/etc /var/jail/run 123M 632K 112M 1% /packages/mnt/jweb-ex-10.4I20110121_0509_hbRPSRLI15184421081/jail/var/run /var/jail/tmp 123M 632K 112M 1% /packages/mnt/jweb-ex-10.4I20110121_0509_hbRPSRLI15184421081/jail/var/tmp /var/tmp 369M 20K 339M 0% /packages/mnt/jweb-ex-10.4I20110121_0509_hbRPSRLI15184421081/jail/var/tmp/uploads devfs 1.0K 1.0K 0B 100% /packages/mnt/jweb-ex-10.4I20110121_0509_hbRPSRLI15184421081/jail/dev
Meaning
The presence of the partition name containing s4d indicates that there is a fourth slice. If this were a three-slice partition scheme, in place of s1a, s3e, s3d, and s4d, you would see s1a, s1f, s2a, s2f, s3d, and s3e and you would not see s4d.
Verifying the Loader Software Version
Purpose
For the special case of upgrading from Junos OS Release 10.4R2 or earlier to Release 10.4R3 or later, you must upgrade the loader software.
Action
For EX Series switches except EX8200 switches:
user@switch> show chassis firmware Part Type Version
FPC 0 uboot U-Boot 1.1.6 (Jan 3 2011 - 16:14:58) 1.0.0
loader FreeBSD/PowerPC U-Boot bootstrap loader 2.4
For EX8200 switches:
user@switch> show chassis firmware Part Type Version
FPC 0 uboot U-Boot 1.1.6 (Jan 3 2011 - 16:14:58) 3.5.0
loader FreeBSD/PowerPC U-Boot bootstrap loader 2.4
Meaning
For EX Series switches other than EX8200 switches, with Junos OS Release 10.4R3 or later installed:
- If there is version information following the timestamp for U-Boot (1.0.0 in the preceding example), then the loader software does not require upgrading.
- If there is no version number following the timestamp for U-boot, then the loader software requires upgrading.
 | Note: If the software version is Release 10.4R2 or earlier, no version number is displayed following the timestamp for U-boot, regardless of the loader software version installed. If you do not know whether you have installed the new loader software, we recommend that you upgrade the loader software when you upgrade the software version. |
For EX8200 switches, if the version number following the timestamp for U-Boot is earlier than 3.5.0, you must upgrade the loader software when you upgrade the software version.
Verifying Which Root Partition Is Active
Purpose
Switches running Release 10.4R3 or later have resilient dual-root partition functionality, which includes the ability to boot transparently from the inactive partition if the system fails to boot from the primary root partition.
You can verify which root partition is active using the following command:
Action
user@switch> show system storage partitionsfpc0:
--------------------------------------------------------------------------
Boot Media: internal (da0)
Active Partition: da0s1a
Backup Partition: da0s2a
Currently booted from: active (da0s1a)
Partitions information:
Partition Size Mountpoint
s1a 184M /
s2a 184M altroot
s3d 369M /var/tmp
s3e 123M /var
s4d 62M /config
s4e unused (backup config)
Meaning
The Currently booted from: field shows which root partition is active.
Verifying the Junos OS Version in Each Root Partition
Purpose
Each switch contains two root partitions. We recommend that you copy the same Junos OS version in each partition when you upgrade. In Junos OS Release 10.4R2 and earlier, you might choose to have different Junos OS release versions in each partition. You might have different versions during a software upgrade and before you have finished verifying the new software installation. To enable a smooth reboot if corruption is found in the primary root file system, ensure that the identical Junos OS images are in each root partition. For Release 10.4R2 and earlier, you must manually reboot the switch from the backup root partition. However, for Release 10.4R3 and later, the switch reboots automatically from the backup root partition if it fails to reboot from the active root partition.
Action
Verify whether both root partitions contain the same image by using the following command:
user@switch> show system snapshot media internalInformation for snapshot on internal (/dev/da0s1a) (backup) Creation date: Jan 11 03:02:59 2012 JUNOS version on snapshot: jbase : ex-12.2I20120305_2240_user jcrypto-ex: 12.2I20120305_2240_user jdocs-ex: 12.2I20120305_2240_user jroute-ex: 12.2I20120305_2240_user jswitch-ex: 12.2I20120305_2240_user jweb-ex: 12.2I20120305_2240_user Information for snapshot on internal (/dev/da0s2a) (primary) Creation date: Mar 6 02:24:08 2012 JUNOS version on snapshot: jbase : ex-12.2I20120305_2240_user jcrypto-ex: 12.2I20120305_2240_user jdocs-ex: 12.2I20120305_2240_user jroute-ex: 12.2I20120305_2240_user jswitch-ex: 12.2I20120305_2240_user jweb-ex: 12.2I20120305_2240_user
Meaning
The command shows which Junos OS version is installed on each media partition. Verify that the same version is installed on both partitions.
