My scenerio is: Three leased lines provided by two different ISPs and each connected to a seperate router. Main office have two leased line (provided by ISP A and B) for load balancing and redunducy. The other leased line (provided by ISP A) will located in a remote site for backup and disaster recovery. I have my own AS no. and a class c IP address. All the lines are frame relay.
I am going to configure BGP in all the routers, and advertis my class c network to the ISPs. And then they will have announce my network to the Internet.
My goal is if the lines in main office is normal, all incoming will pass throught them. If both lines in main office are down, then all the traffic should be pass throught the remote site. I would like to know is there any configuration of BGP can make the BGP neighbor keep check with the health status of the BGP neighbors in the main office.
If both the neighbors in the main office is active and normal, then the neighbor in the remote site don't advertise my netowrk to the ISP, so the Internet traffic wouldn't go to the remote site.
If no BGP configuration can archive this task, is there any configuration of cisco can archive it?
I think BGP MEDS and AS prepending can achieve less of the task. Since one of the leased line and the backup line are provided by the same ISP. If the line provided by that ISP is down, but the backup line is not, then there may have chance for the Internet traffic to pass through the backup line. Although the BGP MEDS value is higher and has AS prepending in backup line router.
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.