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Cisco Bug: CSCvh95956 - Cannot assign FEX interface to port-channel on N9K, with jumbo MTU; port not compatible [MTU]

Last Modified

Oct 28, 2019

Products (52)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 92160YC-X Switch
  • Cisco Nexus 31108TC-V Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 92304QC Switch
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Known Affected Releases

7.0(3)I7(3) 7.0(3)IHD8(0.327)

Description (partial)

Cannot add fex interface to port-channel

command failed: port not compatible [MTU] 
** You can use force option to override the port's parameters 
** (e.g. "channel-group X force") 
** Use "show port-channel compatibility-parameters" to get more information on failure

N9K (running any version) and FEX (any fex), single homed. 
FEX NIF port-channel configured for mtu 9216
Interface port-channel configured for mtu 9216 and trying to add FEX interface to this new port-channel

This behavior can be seen even if the ports are shutdown
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