Always use Cisco UCS VLAN Manager even with single uplink! Life isn’t perfect or fair, someone will screw up your perfect architecture one day… trust another uplink is coming your way!
Supporting info:
Deploy Layer 2 Disjoint Networks Upstream in End Host Mode
http://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/unified-computing/white_paper_c11-692008.html
Configuring Upstream Disjoint Layer-2 Networks
http://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/sw/gui/config/guide/2-0/b_UCSM_GUI_Configuration_Guide_2_0/b_UCSM_GUI_Configuration_Guide_2_0_chapter_010101.html
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