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100G MetroCluster IP port down with Cisco switch

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Applies to

  • ONTAP 9
  • 100G PCC transceiver (copper)
  • Dual 40/100G Ethernet T62100-CR card 
  • Cisco Nexus 9336 back-end switch

Issue

  • MetroCluster IP port reported as down:
slot 1: Dual 40/100G Ethernet T62100-CR

  e1b MAC Address:    12:34:56:71:d2:08 (auto-unknown-fd-down)
      QSFP Vendor:
      QSFP Part Number:
      QSFP Serial Number:
  Device Type:        T6 2
  Firmware Version:   1.25.0.40
  Part Number:        110122860E0
  Hardware Revision:  0
  Serial Number:      PT234561330
  • Setting the port speed manually on the connected back-end switch - instead of using the default auto-negotiation - brings the link up: 

Example:

switch_A_1# conf t 
switch_A_1(config)# interface Eth1/9 
switch_A_1(config-if)# speed 100000

 

 

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