Nexus SFP Invalid – Validation Failed

This is a note to remind myself of this error in the future.

On site today i cam across a port member of a port channel associated with a vPC not coming up.  Checking the status gave:

Core_Switch# show int eth 1/11 status
Port Name Status Vlan Duplex Speed Type
Eth1/11 -- sfpInvali 1 full 1000 SFP-H10GB-A

When i looked under the interface itself, this stood out …

Core_Switch# show int eth 1/15
Ethernet1/11 is down (SFP validation failed)
 Dedicated Interface 
 Belongs to Po100
 Hardware: 1000/10000 Ethernet, address: <output removed> (bia <output removed>)
 MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec
 reliability 255/255, txload 1/255, rxload 1/255
 Encapsulation ARPA
 Port mode is fex-fabric
 auto-duplex, 1000 Mb/s, media type is 10G <<<<<<<<<
 Beacon is turned off
 Input flow-control is off, output flow-control is off
 Rate mode is dedicated
 Switchport monitor is off 
 EtherType is 0x8100 
 Last link flapped never
 Last clearing of "show interface" counters 39w6d
 0 interface resets
 30 seconds input rate 0 bits/sec, 0 packets/sec
 30 seconds output rate 0 bits/sec, 0 packets/sec
 <output removed>

It looks like the port was previously used with a 1G SFP.  When i created the port-channel it took that value, and when i tried to manually change on the port it wouldn’t recognise the command.

Core_Switch(config)# int eth 1/15
Core_Switch(config-if)# spe?
% Invalid command at '^' marker.

Core_Switch(config-if)# default interface ethernet 1/15
Core_Switch(config)# int eth 1/15
Core_Switch(config-if)# sp
spanning-tree speed

The problem is if its associated with an port channel then once you put the port in a port channel the 1G configuration gets put back on.  Future me needs to remember to change the speed on the port-channel!  It kind of makes sense that its showing SPF invalid, but its not very helpful.







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