NEXUS 7K 40GB Links Not Connected Using QSFP-40G-SR on 8.4(2)

[tTM]

We have two new NEXUS 7706 switches to mimic what we have in another datacenter. The other datacenter nexus are running on 8.4(7) and the QSFP-40G-SR transceivers work fine. However, the new equipment is running 8.4(2) and I cant get any of these modules to work.

The connections are between the two 7706s and also between a pair of NEXUS 9504s. None of the 40Gb links are coming up.

The configurations are identical. I am not onsite so I cant verify what kind of fiber is being used, but I assume its the same as the equipment that works.

Any ideas? I am going to try to upgrade but wont be able to perform it right away.

[tTM]

I was trying to bring up VPCs, but just to troubleshoot I went ahead and configured a basic trunk just to rule out my VPC configuration. 

#################################################

Switch 1:

interface Ethernet1/23
description VPC-PEER-LINK
switchport mode trunk
switchport trunk native vlan 666
switchport trunk allowed vlan 2-4094
no shutdown

show int status:

Eth1/23 VPC-PEER-LINK notconnec trunk auto auto QSFP-40G-SR

sh int eth 1/23 transceiver
Ethernet1/23
transceiver is present
type is QSFP-40G-SR-BD
name is CISCO-AVAGO
part number is AFBR-79EBPZ-CS2
revision is 01
serial number is AVM2620U24V
nominal bitrate is 20600 MBit/sec per channel
Link length supported for 50/125um OM3 fiber is 100 m
cisco id is --
cisco extended id number is 220
cisco part number is 10-2945-02
cisco product id is QSFP-40G-SR-BD
cisco vendor id is V02

######################################################

Switch 2:

interface Ethernet1/23
description VPC-PEER-LINK
switchport mode trunk
switchport trunk native vlan 666
switchport trunk allowed vlan 2-4094
no shutdown

show interface status:

Eth1/23 VPC-PEER-LINK notconnec trunk auto auto QSFP-40G-SR

show int eth 1/23 transceiver
Ethernet1/23
transceiver is present
type is QSFP-40G-SR-BD
name is CISCO-AVAGO
part number is AFBR-79EBPZ-CS2
revision is 01
serial number is AVM2620U28D
nominal bitrate is 20600 MBit/sec per channel
Link length supported for 50/125um OM3 fiber is 100 m
cisco id is --
cisco extended id number is 220
cisco part number is 10-2945-02
cisco product id is QSFP-40G-SR-BD
cisco vendor id is V02

[tTM]

Im wondering if maybe these QSFPs wont work with shorter patch cables?

[tTM]

I have been able to get a 40Gb link up between two new NEXUS 9504s, however they are using QSFP-40G-SR-BD transceivers.

Eth1/34 DISTRO-SW1 E1/34 connected trunk full 40G QSFP-40G-SR-BD