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VDX Port flapping during server's PXE Boot

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TitleVDX Port flapping during server's PXE Boot
Symptoms
  • Port flapping (about 10 times in 3 seconds)
  • Port in admin down state
Environment
  • VDX
  • Dell server
  • Intel x722 adapter
  • ThinkSystem SD530, Type 7X21, any mode
  • ThinkSystem 10Gb 2-port SFP+ LOM, Option 7ZT7A00546, any model
  • ThinkSystem 10Gb 4-port SFP+ LOM, Option 7ZT7A00547, any model
Cause
Interference in handshake communication between adapter and switch port
Resolution
Disabled the following items on the VDX edge port connected to the server:
  • fabric isl
  • fabric trunk
  • fabric neighbor-discovery
Ex.
VDX1# conf t
Entering configuration mode terminal
VDX1(config)# interface TenGigabitEthernet 1/0/1
VDX1(conf-if-te-1/0/1)# no fabric isl enable
VDX1(conf-if-te-1/0/1)# no fabric trunk enable
VDX1(conf-if-te-1/0/1)# fabric neighbor-discovery disable

 
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