Multiple IDP but single login challenge

[pallavi.tambe]

I am new to SAML Shibboleth. Need help from the experts here. 

I have a scenario, where I have 2 IDPs (IDP1 and IDP2), the user database is
in sync. So if user is logged in using IDP1, and I am in the same browser my
SP2 should be able to use the assertions from IDP1 and should not show login
challenge for IDP2. 

Is this type of configuration possible in SP2? 

If yes can you please point me to configurations? 

Thanks in advance, 

Pallavi



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