Script problem with /ip address get X, where X interface not exist

RouterOS General
1

Guys,
can you please help me with script?

I’m trying to achive “if interface doesn’t have valid IP log warning else do some action”

Script that I’m using is like:

:log info "debug 0";
:global iq [/ip address get 2 address];
log info "debug iq - $iq";

If interface 2 is disabled, or DHCP client on interface 2 is disabled the script will log only “debug 0” it will not get to “debug iq”

Similar behavior with this

:if ([:len [/ip address get 2 address]] < 9) do={
   :log warn "i am short";
}

The rest of the script is not executed.
When interface is running and DHCP client has IP it works. But I need to check for invalid situation.

2

Somehow I found the solution myself. So here is the code.

:global iq [/ip address find interface="non-existing-eth"]
:if ([:len $iq] != 0) do={
   :log info "exist";
} else={
   :log warn "Not exist";
}

It works this way…

  • It try to find interface “non-existing-eth” in /ip address
  • If it is not found IQ length is 0, so it will perform :log warn “Not exist”;
  • If it is found IQ length is not 0(usually 1), and you can work with the interface.