I have dual SUPs 6L-E on C4507. It was configured default SSO mode. I have EIGRP running on port G1/1 and port G2/1. When I issued the command" redundancy force-switchover", am I supposed to see EIGRP neighbors reestablished? Will SSO be able to maintain EIGRP neighbors during the switchover?
On the above image we can see what elements are synchronized between an active and standby modules according the redundancy mode.
We can see that L3 routing protocols are not synchronized in SSO but convergence can be optimized with NSF (Non-stop forwarding) function.
About NSF with SSO, Cisco link http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/54sg/configuration/guide/NSFwSSO.html#wp1131455 provides all the details on how it works with other nsf capable devices and how it can improve the L3 convergence (EIGRP in you case).
Hope that help.