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You can switch over the agents that you have upgraded at any time before upgrading the oms, but your agent will appear as down in 10205 oms, because 12c agent is not compatible with 10205, 12c agent work only with 12c oms, once you upgrade your oms to 12c then you will see the agents as up status.
Please go through to the doc
To add to what Nazim mentioned, in 1-system you can deploy agents (batches of 10 that you are doing) and then switch them as well. Once you switch them the 10205 agent will be shown as down in em 10205 console as switching operation is shutting down your 10205 agents and bring up 12c agents. Since 12c agents are not supported with 10205 EM , they will be not be shown at all. In 1-system the downtime of your EM system essentially start from switching operation till you finish your OMS/rep upgrade.
Edited by: Akanksha on Feb 5, 2013 1:40 PM