CIsco 2620XM failover question

Is there any reson why weighted static routes would not work ? (Assuming you see you primary interface go down)

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Reliable Static Routing Backup Using Object Tracking

A good solution if the T1 does not fail reliably at the link level when it becomes unusable (if the T1 does fail reliably, a simple floating static would do the job). Not a useful solution if the

2620XM is also doing NAT and the translations are not identical on both upstream interfaces. Been there, done that, been burnt.

The router has two static IP address(es) and no nating is being done on the the router.

I applied two weighted static IPs to the interfaces, but was not sure if the router would failover properly. I've read that the static IP scheme would work on say, dual serial connections reliably but not on 1 serial and 1 ethernet.

Thank you for the suggestions.

Chris

As I read your original requirements, the only time the Ethernet ISP will be used is when the T1 ISP is down, so there is no need to dynamically detect when the Ethernet ISP is down (but you do need to routinely test or it won't be up when you do need it).

You also need to address how your T1 ISP will detect when the T1 is down and what steps they will take to route traffic coming back into you over to the Ethernet ISP. TCP/IP only works if both directions still work. Note that this is automatic if your Ethernet ISP interface/modem/router/black box or whatever uses NAT to change the return address to something unique to that link, although this approach has the side effect of taking down all sessions when a switch over occurs.

As you can probably tell by the answers so far, there are a lot of alternative solutions whose utility and effectiveness depend upon the exact details of how you have your connections set up and what your usage requirements are. For example, there is a huge difference between protecting the ability of inside users to reach the Internet for web browsing and serving up web pages to the general public. So far, all the solutions being discussed have been for the former and would leave you high and dry if you needed the latter.