Changing Interface state using EEM
This is a simple attempt to get familiar with EEM. Here, an example configuration of EEM is used to change the state of the interface to UP when the state goes DOWN accidentally.
First, the interface Loopback0 is enabled manually.
Loopback0 interface
interface Loopback 0
no shutdown
!
The router is configured with EEM configuration as below-
EEM Configuration
event manager applet LOOP0
event syslog pattern "Interface Loopback0.* down" period 1
action 1.0 syslog msg "Interface Loopback0 DOWN"
action 2.0 cli command "enable"
action 2.1 cli command "config t"
action 2.2 cli command "interface loopback 0"
action 2.3 cli command "no shutdown"
action 3.0 syslog msg "Interface Loopback0 UP"
!
Test run:
When the Loopback0 interface is shutdown manually, it triggers the EEM applet and performs the configuration.
Output
interface loopback 0
shutdown
!
*Mar 1 00:07:50.771: %LINK-5-CHANGED: Interface Loopback0, changed state to administratively down
*Mar 1 00:07:50.779: %HA_EM-6-LOG: LOOP0: Interface Loopback0 DOWN
*Mar 1 00:07:50.859: %HA_EM-6-LOG: LOOP0: Interface Loopback0 UP
*Mar 1 00:07:52.851: %LINK-3-UPDOWN: Interface Loopback0, changed state to up
TIP
If the EEM applet relies on syslog msg, make sure the logging console and terminal monitor is ON.