I have two external internet service providers.
I want to introduce internet circuit redundancy on my customer edge internet routers only.
I'm not interested in receiving all routes on my internet edge routers just the default route.
I would like to make one of the Internet circuits as the primary and the other as the secondary.
I host email, web, and some other internet facing applications.
I would like to know what kind of configuration is required to utilize ISP A as the primary and ISP B as the secondary and roll the public IP addresses of ISP A to ISP B so the firewall IP addresses, email, web, and other internet facing applications failover and continue to run on ISP B.
The physical layout is as such
RouterA connected to ISP A
Router B connected to ISP B
Switch A connecting Router A Gigabit Ethernet0/1
Switch A connecting Gigabit Ethernet0/0 for ASA A
Switch B connecting Router B Gigabit Ethernet0/1
Switch B connecting Gigabit Ethernet0/0 for ASA B
The Cisco ASA firewalls configured as HA Primary and Standby
Dual DMZ switches and Dual internal switches that lead into the inside of the network.
I would like some documentation or links that discusses the Dual Internet circuit redundancy. I believe this is called BGP Multihoming but on the document I was reading I did not see the example that the public IP addresses roll over between ISP A and ISP B.
Thanks a lot