The behavior of ip helper-address is quite simple and straightforward. When the Cisco router configured with two ip helper-address received an eligible local broadcast (such as DHCP) it will forward a copy of the broadcast to each of the configured helper addresses. The result is that each server will receive a copy of the request. Note that this is exactly the same effect as if both servers were in the local LAN where they would both receive the DHCP request.
Part of what this means is that while you can easily have redundant servers it is difficult to have primary and backup servers.
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.