In ths post we will look at a means for tracking a default route learned by ospf and generation of a syslog alert for when the route disappears
The cisco EEM and IP SLA are being together to clear our route-table. In the core network, we have 2 exits one path being preferred by ospf-metrics
1st we write a simple IP SLA , this is the heart of our check ;
ip sla 200
Next we active it & set a track ;
ip sla schedule 200 start-time now life forever
track 200 ip sla 200
Finally we build a cisco eem applet that will generates a log msg if the gateway is lost;
event manager applet Default_Gone
event track 200 state any
action 1.0 syslog msg "ping to outside gw has died, ospf-neighbor is probably gone or down"
You can use other action items like reset the router ospf or clear ospf neighbor or install another path route.
Freelance Network/Security Engineer
kfelix -----a----t---- socpuppets ---dot---com
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