Understanding System Snapshot On Ex Series Switches - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

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Understanding System Snapshot on EX Series Switches

78
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OS for EX Series Ethernet Switches, Release 10.4
A sample EX Series software package name is:
jinstall-ex-4200-9.5R1.6-domestic-signed.tgz
Installing Software on EX Series Switches (J-Web Procedure) on page 90
Installing Software on an EX Series Switch with a Single Routing Engine (CLI Procedure)
on page 84
Installing Software on an EX8200 Switch with Redundant Routing Engines (CLI
Procedure) on page 85
Downloading Software Packages from Juniper Networks on page 83
Understanding Software Installation on EX Series Switches on page 75
You can create copies of the software running a Juniper Networks EX Series Ethernet
Switch using the system snapshot feature. The system snapshot feature takes a
"snapshot" of the files currently used to run the switch—the complete contents of the
/config and /var directories, which include the running Juniper Networks Juniper operating
system (Junos OS), the active configuration, and the rescue configuration—and copies
all of these files into an alternate (internal, meaning internal flash, or an external, meaning
USB flash) memory source. You can then use this snapshot to boot the switch at the
next bootup or as a backup boot option.
You can only use snapshots to move files to external memory if the switch was booted
from internal memory, or to move files to internal memory if the switch was booted from
external memory. You cannot create a snapshot in the memory source that booted the
switch even if the snapshot is being created on a different partition in the same memory
source.
Snapshots are particularly useful for moving files onto USB flash drives. You cannot use
the command or any other file-moving technique to move files from an internal
copy
memory source to USB memory on the switch.
System snapshots on EX Series switches have the following limitations:
You cannot use snapshots to move files to any destination outside of the switch other
than an installed external USB flash drive or to move files between switches that are
members of the same virtual chassis.
Snapshot commands, like other virtual chassis commands, are always executed on a
local switch. In cases where a different member switches of the same virtual chassis
requests the snapshot, the snapshot command is pushed to the VC member creating
the snapshot, executed, and the output is then returned to the switch that initiated the
process. For instance, if the command to create an external snapshot on virtual chassis
member 3 is entered from virtual chassis member 1, the snapshot of internal memory
on virtual chassis member 3 is taken on external memory on virtual chassis member
3. The output of the process is seen from virtual chassis member 1. No files move
between the switches.
Copyright © 2010, Juniper Networks, Inc.