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CSCuz66798 40G link does not come up with QSFP-40G-CR4 CISCO cable

I found the same behaviour on IOS XE 16.6.4, 16.8.1s and 16.9.1. I tested with Catalyst 9500 and 9300. With IOS 16.6.3 speed auto negotiation works, but when I upgraded one switch the link did not come up until I configured speed nonegotiate. 

 

Before workaround:

 

interface FortyGigabitEthernet1/0/1
switchport mode trunk
end

 

C9500#sh int statu

Port Name Status Vlan Duplex Speed Type
Fo1/0/1 notconnect 1 full 40G QSFP 40G CR4 SFP
Fo1/0/2 notconnect 1 full 40G QSFP 40G CR4 SFP
Fo1/0/3 connected 1 full 10G SFP-10GBase-CX1

 

Cat 9300:

 

interface FortyGigabitEthernet1/1/1
switchport mode trunk
end

 

Switch#sh int statu

Port Name Status Vlan Duplex Speed Type
Fo1/1/1 connected 1 full 40G QSFP 40G CR4 SFP
Fo1/1/2 notconnect 1 auto auto unknown

 

After workaround applied on Cat 9500 witch IOS 16.9.1:

 

interface FortyGigabitEthernet1/0/1
switchport mode trunk
speed nonegotiate
end

 

Aug 10 18:29:57.275: %LINK-3-UPDOWN: Interface FortyGigabitEthernet1/0/1, changed state to up
Aug 10 18:29:58.359: %LINK-3-UPDOWN: Interface FortyGigabitEthernet1/0/2, changed state to up
Aug 10 18:29:59.281: %LINEPROTO-5-UPDOWN: Line protocol on Interface FortyGigabitEthernet1/0/1, changed state to up
Aug 10 18:30:00.363: %LINEPROTO-5-UPDOWN: Line protocol on Interface FortyGigabitEthernet1/0/2, changed state to up

 

C9500#sh int statu

Port Name Status Vlan Duplex Speed Type
Fo1/0/1 connected trunk full 40G QSFP 40G CR4 SFP
Fo1/0/2 connected trunk full 40G QSFP 40G CR4 SFP
Fo1/0/3 connected 1 full 10G SFP-10GBase-CX1

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