We have a single T/1 to an ISP running on a 1720. The ethernet side of the 1720 is connected to a PIX 515. The other night our ISP lost power in their data center in San Jose and we are located in Irvine. Consequently we were not able to route any inbound or outbound traffic to the internet. Is it possible to connect a backup circuit such as (ISDN or DSL) to avoid this or will we need to go to BGP and 2 different ISP's.
You should be able to use ISDN, DSL, cable, etc... as a backup.
You can use addresses given you by the alternate provider with NAT to insure that your packets get back properly.
Also, you can use a floating static to insure auto-failover in the event you lose your T1. If your upstream provider loses their routes, but maintains your T1 connection, you'll either need to use a routing protocol, or manually shut down the interface to fail over.
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.