====== Juniper / JunOS tips ======

=== commit confirmed ===

after editing save things like
   # commit confirmed

and if every works as use planned to? confirm the configration with
   # commit

otherwise the new configuration will be automatically rollback if not confirmed.

===== Flash recover =====

   dd if=/dev/zero of=/dev/rad3 count=20
   dd if=install-media-5.4R3.2-domestic of=/dev/rad3 bs=64k

===== junos bash policer =====
<code bash>
#!/bin/bash
# junos bash policer
# http://tnt.aufbix.org/
echo
if [ $# -lt 2 ]; then
echo 1>&2 "$0: not enough arguments"
echo
echo "example:"
echo -e "1gb =\t./junos_policer\t1gb\t1000000000"
echo -e "100mb =\t./junos_policer\t100mb\t100000000"
echo -e "1mb =\t./junos_policer\t1mb\t1000000"
exit 0
fi
echo
cir=$(($2/1000*500/8))
if (( $cir  < 15000 )); then
cir=15000
fi
echo "set firewall policer $1 logical-interface-policer"
echo "set firewall policer $1 if-exceeding bandwidth-limit $2"
echo "set firewall policer $1 if-exceeding burst-size-limit $cir"
echo "set firewall policer $1 then discard"
</code>

===== Lost disk from Junos boot order =====
original: [[http://dataplumber.wordpress.com/2011/01/26/lost-disk-from-junos-boot-order/|The Data Plumber]]


**To check this out do the following:**

   1. start shell
   2. sysctl machdep.bootdevs

This second command will tell you the order in which devices are booted from. If ‘disk’ is absent from that list, you need to add it back in and reboot the routing-engine. Do the following:

   su root (you’ll need the root password for this)
   sysctl -w machdep.bootdevs=usb,compact-flash,disk,lan
   Exit from the shell and reboot the RE.

The above is for an MX960 with an RE-2000 installed, and the device names change a bit depending on what you are using. Best to check it against another working system if you can.

Here’s a cut-and-paste from my MX960:
<code>
root@MX960-RE1% sysctl machdep.bootdevs
machdep.bootdevs: usb,compact-flash,lan
root@MX960-RE1% sysctl -w machdep.bootdevs=usb,compact-flash,disk,lan
machdep.bootdevs: usb,compact-flash,lan -> usb,compact-flash,disk,lan
root@MX960-RE1% exit
exit
% sysctl machdep.bootdevs
machdep.bootdevs: usb,compact-flash,disk,lan
% exit
</code>