08-05-2009 08:17 AM - edited 03-04-2019 05:39 AM
I am in the process of configuring our network with dual internet connections through separate firewalls using different ISP carriers. We will be using BGP for inbound traffic, but how do I configure our outbound traffic for internet failover? I am running OSPF internally on all the core switches. Our current internet connection is in our Data Center 1 (as noted in the drawing) and the 2nd, proposed, connection will be at our Headquarters. I want the traffic to go through Data Center 1 and if there is an issue, failover to the Headquarters ISP. I currently have my gateway of last resort routes mapped to the Data Center 1 connection. I assume I need to remove those routes and let OSPF handle default routes? Any help will be greatly appreciated. TIA.
08-05-2009 04:22 PM
Hi
I'm only a CCNA student, so I can make a mistake..
But I try to give you my solution.
You probably configured the boundary router of Data Center 1 as the gateway of last resources whit the link to ISP as exit interface.
The OSPF has an Administrative Distance of 110
If you put a default static route on this gateway ( to the Headquarter exit )
with command ip route you can set 111 as Administrative Distance ( not using 1 as default)
this route won't be the best route untill the link from data Center 1 and ISP is up.
If this link fails the default route will be added in the routing table.
08-05-2009 04:44 PM
I found a url who explains this method.
It's called Floating Static Routes
http://www.netcraftsmen.net/resources/archived-articles/524-designing-default-and-dial-backup.html
08-05-2009 05:39 PM
Seems easy enough. I'll give that a try.
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