I would look at this to see if it answers your question, http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus2000/sw/configuration/guide/rel_6_2/b_Cisco_Nexus_2000_Series_NX-OS_Fabric_Extender_Software_Configuration_Guide_Release_6-x/b_Configuring_the_Cisco_Nexus_2000_Series_Fabric_Extender_rel_6_2_chapter_010.html#reference_E9C2D0CE06DB4289A543623C3E60B76D