how to upgrade idp 1.3 to idp2.x?

[XiaoXia Dong]

Dear experts,

I am in the process of planning upgrade our shibboleth server from idp 1.3 to Idp 2.x. I am fuzzy on how to do the emulation step.
How anyone tried to configure idp 2.x to look like idp 1.3 successfully from your experience? What does it take to get that working?

Is it possible to configure idp 2.x to look like 1.3 and no need to change current metadata for idp 1.3 in InCommon and bring up two Idp (current idp 1.3 and new idp 2.x with same entityID) in parallel?  Could anyone share their experience if this is possible?

If none of the above is possible, could someone share what needs to be done in metadata so that make current Idp 1.3 to be 2.x compatible?

Thanks in advance for any information you would like to share.
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