S4112F-ON breakout 40Gb

S4112F-ON:

interface ethernet1/1/15:1
 no shutdown
 switchport access vlan 900

Ethernet 1/1/15:1 is up, line protocol is down
Hardware is Dell EMC Eth, address is 20:04:0f:08:61:a0
    Current address is 20:04:0f:08:61:a0
Pluggable media present, QSFP-PLUS type is QSFP_40GBASE_CR4_1M
    Wavelength is 38
    Receive power reading is
Interface index is 17305433
Internet address is not set
Mode of IPv4 Address Assignment: not set
Interface IPv6 oper status: Disabled
MTU 1532 bytes, IP MTU 1500 bytes
LineSpeed 0, Auto-Negotiation on
Flowcontrol rx off tx off
ARP type: ARPA, ARP Timeout: 60
Last clearing of "show interface" counters: 3 days 01:53:21
Queuing strategy: fifo
Input statistics:
     0 packets, 0 octets
     0 64-byte pkts, 0 over 64-byte pkts, 0 over 127-byte pkts
     0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
     0 Multicasts, 0 Broadcasts, 0 Unicasts
     0 runts, 0 giants, 0 throttles
     0 CRC, 0 overrun, 0 discarded
Output statistics:
     0 packets, 0 octets
     0 64-byte pkts, 0 over 64-byte pkts, 0 over 127-byte pkts
     0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
     0 Multicasts, 0 Broadcasts, 0 Unicasts
     0 throttles, 0 discarded, 0 Collisions, 0 wred drops
Rate Info(interval 30 seconds):
     Input 0 Mbits/sec, 0 packets/sec, 0% of line rate
     Output 0 Mbits/sec, 0 packets/sec, 0% of line rate
Time since last interface status change: 3 days 01:53:22

S4048T-ON

interface fortyGigE 1/49
 no ip address
 switchport
 no shutdown

Hardware is DellEMCEth, address is e4:f0:04:c2:08:ad
    Current address is e4:f0:04:c2:08:ad
Pluggable media present, QSFP type is 40GBASE-CR4-1M
Interface index is 2103301
Internet address is not set
Mode of IPv4 Address Assignment : NONE
DHCP Client-ID :e4f004c208ad
MTU 1554 bytes, IP MTU 1500 bytes
LineSpeed 40000 Mbit
Flowcontrol rx off tx off
ARP type: ARPA, ARP Timeout 04:00:00
Last clearing of "show interface" counters 3d19h23m
Queueing strategy: fifo
Input Statistics:
     0 packets, 0 bytes
     0 64-byte pkts, 0 over 64-byte pkts, 0 over 127-byte pkts
     0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
     0 Multicasts, 0 Broadcasts, 0 Unicasts
     0 runts, 0 giants, 0 throttles
     0 CRC, 0 overrun, 0 discarded
Output Statistics:
     0 packets, 0 bytes, 0 underruns
     0 64-byte pkts, 0 over 64-byte pkts, 0 over 127-byte pkts
     0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
     0 Multicasts, 0 Broadcasts, 0 Unicasts
     0 throttles, 0 discarded, 0 collisions, 0 wreddrops
Rate info (interval 299 seconds):
     Input 00.00 Mbits/sec,          0 packets/sec, 0.00% of line-rate
     Output 00.00 Mbits/sec,          0 packets/sec, 0.00% of line-rate
Time since last interface status change: 3d19h22m

S4048T-ON

interface fortyGigE 1/49
 no ip address
 switchport
 no shutdown

Hardware is DellEMCEth, address is e4:f0:04:c2:08:ad
    Current address is e4:f0:04:c2:08:ad
Pluggable media present, QSFP type is 40GBASE-CR4-1M
Interface index is 2103301
Internet address is not set
Mode of IPv4 Address Assignment : NONE
DHCP Client-ID :e4f004c208ad
MTU 1554 bytes, IP MTU 1500 bytes
LineSpeed 40000 Mbit
Flowcontrol rx off tx off
ARP type: ARPA, ARP Timeout 04:00:00
Last clearing of "show interface" counters 3d18h52m
Queueing strategy: fifo
Input Statistics:
     0 packets, 0 bytes
     0 64-byte pkts, 0 over 64-byte pkts, 0 over 127-byte pkts
     0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
     0 Multicasts, 0 Broadcasts, 0 Unicasts
     0 runts, 0 giants, 0 throttles
     0 CRC, 0 overrun, 0 discarded
Output Statistics:
     0 packets, 0 bytes, 0 underruns
     0 64-byte pkts, 0 over 64-byte pkts, 0 over 127-byte pkts
     0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
     0 Multicasts, 0 Broadcasts, 0 Unicasts
     0 throttles, 0 discarded, 0 collisions, 0 wreddrops
Rate info (interval 299 seconds):
     Input 00.00 Mbits/sec,          0 packets/sec, 0.00% of line-rate
     Output 00.00 Mbits/sec,          0 packets/sec, 0.00% of line-rate
Time since last interface status change: 3d18h51m

S4048T-ON for1/49   <-> S4112F-ON eth1/1/15:1

My understanding was that the S4112F-ON could be broken out to 40Gb.  This is a  100GbE (QSFP28) port.  I tried breakout "manually" to 40 Gb with:

interface breakout 1/1/15 map 40g-1x

It is currently configured with the "feature auto-breakout".   Neither have provided me a link.  

The cable is DAC-QSFP-40G-1M 05NP8R.

The end goal is to have them both as trunks with all vlans tagged.  I have tried it both with and without vlan configured.  Doesn't seem to make a difference.

Can't manually set the speed but this put me on the right path.  Had to turn negotiation off on the 4112.  Thanks for the help.

Hi did you ever resolve this I have the same issues. 

Just fixed the same issue with a simple #negotiation off on the S4112.

My set-up is a S4048 mode trunk with a S4112.

Hardware is a Dell DAC QSFP+ 40GBASE-CR4-0.5M
Breakout map is set at #breakout 1/1/15 map 40g-1x

Its a bit late but I hope it helps someone here...