Using IP SLA and EEM to provide 3G backup to ADSL connection on CISCO887VAG+7-K9 router
On a Cisco887VAG+7-K9 router, I want to be able to use IP SLA and EEM to track connectivity to an external address via my ADSL line, if connectivity is UP then I want the 3G interface to be admin shutdown. If connectivity is down, then I want the 3G interface to be activated and connectivity to resume via 3G.
I have configured this and it works apart from one problem. If the config on the router is written to startup memory while the 3G interface is admin shutdown, we subsequently have a problem with the ADSL line and the router is then rebooted, then the EEM does not seem to re-activate the 3G interface so all connectivity is lost until the ADSL is returned to service. i.e. it seems to be the case that if the IP SLA starts off as "Down" then the EEM doesn't take any action. The IP SLA has to have gone into the "up" state before it starts working? Does that make sense and, if so, is there any way round it?
For info, here is my IP SLA and EEM config:
ip sla 1
icmp-echo 8.8.8.8 source-interface dialer2
timeout 60000
ip sla schedule 1 life forever start-time now
track 1 ip sla 1 reachability
ip route 0.0.0.0 0.0.0.0 Dialer2 track 1
ip route 0.0.0.0 0.0.0.0 Dialer1 20
event manager applet 3G-ACTIVATE
event track 1 state down
action 10 cli command "enable"
action 20 cli command "configure terminal"
action 30 cli command "interface Cellular0"
action 40 cli command "no shutdown"
action 50 cli command "end"
event manager applet 3G-DEACTIVATE
event track 1 state up
action 10 cli command "enable"
action 20 cli command "configure terminal"
action 30 cli command "interface Cellular0"
action 40 cli command "shutdown"
action 50 cli command "end"
Any assistance/advice on getting this to work effectively would be appreciated!
Thanks.
Yes, basically, when the tracked object is not reachable on initial router boot, the router doesn’t detect a transition of the tracking object from up to down and therefore does not execute the associated EEM script.
So, in my case, if I have an ADSL fault and the 3G interface has taken over, if the router is subsequently rebooted, all connectivity will be lost because the startup config of the router has the 3G interface as admin down and the EEM script to activate it does not kick in.
I've tried using "default-state up" under the track config but this didn't seem to have any effect - the reachability of my IP SLA was still down after a router reboot with no ADSL connection.
I also tried your script but this gave the errors:
%HA_EM-3-FMPD_ACTION_NOTRACK: bump-track: unable to set state for tracking object number 1; object does not exist or is not a stub-object.
Mar 19 10:23:00.005: %HA_EM-3-FMPD_ERROR: Error executing applet bump-track statement 1.0 %HA_EM-3-FMPD_ACTION_NOTRACK: bump-track: unable to set state for tracking object number 1; object does not exist or is not a stub-object.
Mar 19 10:23:00.005: %HA_EM-3-FMPD_ERROR: Error executing applet bump-track statement 1.0
I'm not sure how to resolve that?
Any further advice would be welcome! Thanks.
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