If your links are connected onto an ethernet port of a router and if you require redundancy with primary/secondary scenario you need to have a special feature called object tracking which will help you out to sense/detect the link failure which is connected onto an ethernet port.
Normally with the link connected onto the ethernet port the port may not go down untill unless theres physical disconnect on the cable or if you remove the cable out of the ethernet port.
When theres any probs with the media which connects you to the SP the ethernet port may not go down and will still remain up making you traffic to be dropped.
So in this case you need to have a tracking mechanism which you keep on sending icmp pings (similar to keepalive packets) and probe the remote destination.
When it looses the reply for the icmp packets send it assumes the link is down and remove starts forwarding the traffic via the secondary link provided you have a secondary link and have your routing configured accordingly..
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.