SRX GENCFG failed error message

Regarding to “/kernel: GENCFG: op 2 (USP Blob) failed; err 7 (Doesn’t Exist)”.

This kernel message is generated because kernel does not have a handler for a certain gencfg blob message.

It is harmless message and showing perhaps due to logging level too verbose.

You can modify your syslog level to ‘any critical’ to avoid these messages.

root@Firewall# set groups node1 system syslog file default-log-messages any ?
Possible completions:
alert Conditions that should be corrected immediately
any All levels
critical Critical conditions
emergency Panic conditions
error Error conditions
info Informational messages
none No messages
notice Conditions that should be handled specially
warning Warning messages


Junos commands you might not aware of

So there is a Junos commands you might not aware of which can make your dealing with configuring a Junos device much easy and simple ! Lets take a look at some of them !

  • ‘rename’ command:

lab@ex-1# rename ge-0/0/6 unit 1 to unit 0

while configuring a switch , accidentally you configure unit 1 to an interface and you cannot commit the configuration because there no such a unit 1 with layer 2 interfaces on EX series switches . So instead of rolling back / deleting wrong configuration , you can simply rename the configuration to the correct one .

  • ‘wildcard’ command:

[edit interfaces]

lab@ex-1# wildcard delete ge-*

matched: ge-0/0/6

matched: ge-0/0/7

matched: ge-0/0/8

delete 3 objects? [yes,no] (no) yes

if you need to delete a lot of line that having something in common , like deleting gig interfaces , you can simply use the ‘wildcard’ command

  • pipe match pipe filter command

user@switch> show interfaces terse | match “interface|0/6|0/7″

Interface Admin Link Proto Local Remote
ge-0/0/6 up down
ge-0/0/6.0 up down eth-switch
ge-0/0/7 up up
ge-0/0/7.0 up up eth-switch

showing multiple matching outputs .

  • ‘copy’ commad

[edit interfaces]

# copy ge-0/0/6 to ge-0/0/7

The copy command duplicates an interface including any child statements such as description.

  • ‘replace’ commad

# replace pattern lopbck with loopback

Make global changes to text patterns in the configuration. For example, if you consistently misspell a word common to the description statement for all of the interfaces on your device, you can fix this mistake with a single command.

  • ‘insert’ command

[edit security policies]
# insert from-zone trust to-zone untrust policy 1 before policy 2

You can use the insert (before/after) to re-order policies instead of deleting and configuring again .

  • ‘refresh’ command

admin@FW> show chassis routing-engine | match Idle | refresh 5                                                         
—(refreshed at 2017-05-03 12:12:24 IDT)—
Idle                      14 percent
Idle                      74 percent
—(refreshed at 2017-05-03 12:12:29 IDT)—
Idle                      14 percent
Idle                      74 percent
—(*more 100%)—[abort]

This command will refresh the output ecery <n> seconds .

How to view SFP info and properties in JunOS machine

In order to find out info of SFP installed in the Junos machine without taking out the SFP module, do the following commands:

  • Log in to the shell of the relevant FPC. For this example I’ll use fpc4:

master@SW-QFX5100> start shell pfe network fpc4

  • show sfp list

(vty)# show sfp list
SFP Toolkit summary:
wakeup count: 47223201, debug: 0, periodic enabled: 1, diagnostics enabled: 1
thread: 0x03deaa78, itable: 0x03ddd868, itable iterator: 0, sem: 0x03e36fe8
polling interval delay:  1000 ms, polling max cpu:  100 ms
poll for diags every  3 wakeups , SFPs polled for diags last time:  2
last periodic CPU time:    1 ms, maximum periodic CPU time:     82 ms
SFP Toolkit syslog throttling parameters:
period: 120 samples , disable threshold:  10, enable threshold   0

Index   Name             Presence     ID Eprom  PNO         SNO          calibr
—–   ————–   ———-   ——–  ———-  ———– ——-
1   Uplink SFP+ PIC(2)      Present   Complete  740-021333  AB33333         int
2   Uplink SFP+ PIC(3)      Present   Complete  740-021222  AB22222         int

I2C Acceleration table
Index   Name             Presence     ID Eprom     Reg ID    I2C Master    I2C Group
—–   ————–   ———-   ——–    ——–    ————   ——-

(vty)# show sfp 1   ?
<carriage return>     Completes command
alarms                SFP diagnostics alarms
diagnostics           display diagnostic measurements and thresholds
info                  SFP information

  • You can use only “show sfp <index of installed sfp>” and you’ll get those kind of information for example:



commit failed error

So you’re having a ‘commit failed’ error whenever you’re issuing the commit command in your SRX device


And you have trying everything you know to troubleshoot this problem, such as:

  • rebooting the device
  • issuing the ‘request system storage cleanup’ command
  • issuing the ‘commit full’ hidden command

Here I give another solution that might be helpful for you:

While connected via console:

1. show configuration | no-more | save current-config (I’d also recommend to take a local backup to your workstation as well, just in case)

2. start shell user root

3. cd /config

4. rm -f juniper.conf+

5. exit from shell

6. enter configuration mode and do a ‘load override current-config’ & commit

SRX Clustering primary\lost

Many of you came across configuring cluster in SRX firewall and got lost after they tried almost everything but they still stuck in “primary\lost” mode .

A lot of engineers are not aware of one important thing which is “cabling arrangement” . And this issue is the most of all “primary\lost” issues !!

So this table will show you where to put fxp0-1 and fab links in every node in cluster


Also you can use SRX HA Configuration Generator tool. It will help you build the best HA  configuration .

You also want to consider interfaces numbering when it comes to configure fab link. Take a look at this table :