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How to upgrade the software version for an EX-Series Switch Virtual Chassis environment

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Article ID: KB10840 KB Last Updated: 29 Mar 2019Version: 6.0
Summary:

The EX-Series Switch Virtual Chassis (VC) software can be upgraded for the entire VC or you can upgrade one individual member of the VC.

Solution:

EX-Series Switches in a virtual chassis environment can be upgraded individually or all members at once from the Master EX (Routing Engine (RE)).  This procedure defines how to use either method.

  • To upgrade all members, use the command 'request system software add <file> reboot' on the master chassis (RE).  This command will upload the software file to all Virtual Chassis (VC) members and reboot them when the upload is complete.
  • To upgrade one member of a VC use the command 'request system software  add <file> member <member_number>' on the master chassis (RE).  This will upload the file to the requested member chassis only.
To find the member id use the command:
user@switch> show virtual-chassis status
Virtual Chassis ID: 001f.1230.478                                        Mastership              Neighbor     List
Member ID       Status    Serial No        Model            priority       Role      ID     Interface
0 (FPC 0)       Prsnt     BN0000000001     ex4200-24p         255          Master*     1      vcp-0     2       vcp-1
1 (FPC 1)       Prsnt     BQ0000000002     ex4200-48p         254          Backup      2      vcp-0     0       vcp-1
2 (FPC 2)       Prsnt     BM0000000003     ex4200-24t         128          Linecard    0      vcp-0     1       vcp-1

Verify that the new software version is installed properly:
user> show version
Hostname: switch
Model: ex4200-24t
JUNOS Base OS boot [9.0-20080110.2]
JUNOS Base OS Software Suite [9.0-20080110.2]
JUNOS Kernel Software Suite [9.0-20080110.2]
JUNOS Crypto Software Suite [9.0-20080110.2]
JUNOS Online Documentation [9.0-20080110.2]
JUNOS Enterprise Software Suite [9.0-20080110.2]
JUNOS Packet Forwarding Engine Enterprise Software Suite [9.0-20080110.2]
JUNOS Routing Software Suite [9.0-20080110.2]
JUNOS Web Management [9.0-20080110.2]

​Outage Impact:

  • For Complete VC upgrade the outage is bigger as all the VC line-card will reboot, including Master RE and backup RE will reboot so that new code will be in effect.
  • For a single FPC upgrade the outage is minimal as it will be an impact to traffic only on that specific FPC
 
{master:0}
root@lab1>
*** System shutdown message from root@ ***
System going down in 30 seconds
*** FINAL System shutdown message from root@lab1 ***

System going down IMMEDIATELY

OWaiting (max 60 seconds) for system process `vnlru' to stop...done
Waiting (max 60 seconds) for system process `vnlru_mem' to stop...done
Waiting (max 60 seconds) for system process `bufdaemon' to stop...done
Waiting (max 60 seconds) for system process `syncer' to stop...
Syncing disks, vnodes remaining...2 2 2 2 1 1 1 1 0 1 1 1 1 0 0 0 0 done

syncing disks... All buffers synced.
Uptime: 4m16s
recorded reboot as normal shutdown

​For a single FPC to recover it may take approximately 2 minutes (keeping in mind it is not just reboot but upgrade).
For the complete VC to recover with upgrade is longer depending on number of FPCs in the VC.

All these activities are needed to be performed under planned maintenance window.


 

Modification History:
2019-03-14: added Outage impact information
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