ISP failed

[mjhagen]

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.

[MickPhelps]

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.

Mick.