jfraasch wrote:
I guess that was the second part of the question. How will it know to failover? If the first link goes down, will it fail to the second?
On a P2P link it should do but it's worth checking with ethernet. If for example the ports were configured as L2 switchports and you had L3 vlan interfaces then no the route would not be removed.
On serial P2Ps it defintely would remove the route if the other end went down but with ethernet it is often necessary to track the availability of the next-hop and if it goes down install another route in the routing table.
An alternative approach is to run a dynamic routing protocol such as EIGRP between the 6500 and 3750. Have 2 P2Ps but only run EIGRP on one of them. And have your floating static on the 3750 pointing to the other end of the link that EIGRP is not running on. What happens here is the 3750s receive routes from the 6500 down the link that EIGRP is running on. EIGRP routes will have a lower AD than your floating static at 200 AD and so they will be used. If the link goes down the route(s) are no longer received so the floating static is used.
Note the above would work without a floating static if the EIGRP routes sent to the 3750s were more specific than the default-route ie. you can just have a normal default-route on the 3750 and it won't be used until the more specific routes disappear. If however you are sending the same route down both links you would need a floating static.
There is always more than one way to acheive the same thing and some are easier than others. I believe the 3750 supports IP SLA but have never used it so it would definitely need testing if you decide to use it.
Jon
