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To debug big network (commerce bank) I created small network from the same types netdevices as big network (Cisco 7206VXR, Cisco 1841, Cisco 1811, Cisco 2960, LINKSYS SRW224G4 ...). But I haven't enough switches and using VLANs on routers instead...
interface FastEthernet0/1/0 switchport mode trunk no ip address
end
The same on F0/1/1. Both (1841, 1811) have identical configurations for 4ESW. 4ESW 1841 connected with 4ESW 1811. Ports f0/0 & f0/1 1841's - trunk ports. The same for 1811.
*...
Why just use weight/cost over both links to get one as primary and second as backup? It's more easy than IP SLA...
I have more than 20 offices with two links on every. All worked well. I use IS-IS with cost on every link.
