QSFPDD to 4x QSFP56 100G Passive DAC,N9K-93600CD-GX

[tim20110612]

Hello

I am having a problem.

400G to 400G Passive DAC
100GBase-CR2 Passive DAC
Both of the above 2 DACs work on my N9K-93600CD-GX.

But QSFPDD 400G to 4x QSFP56 100G (100GBase-CR2), branch cable, is not working, I tried various Breakout configurations.

Has anyone encountered this situation please?

Any advice you can provide would be greatly appreciated. Thanks!

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N9K-93600# sh int e 1/29/1 transceiver details
Ethernet1/29/1
transceiver is present
type is QDD-4ZQ100G-COPPER
name is 
part number is 
revision is A
serial number is 
nominal bitrate is 425000 MBit/sec per channel
cisco id is 24
cisco extended id number is 0
vendor OUI is 0x000000
date code is 240813
power class is 1 (1.5 W maximum)
max power is 0.25 W
cable attenuation is 9/11/16/0/0 dB for bands 5/7/12.9/25.8 GHz
near-end lanes used none
far-end lane code for 8 lanes abcdefgh
media interface is copper cable unequalized
Advertising code is Passive Cu
Host electrical interface code is 100GBase-CR2 (Clause 136)
Cable Length is 1.0 M
CMIS version is 4

DOM is not supported

-------------------------------------------------- --------------------------

N9K-93600# sh int e 1/31 transceiver details
Ethernet1/31
transceiver is present
type is QSFP-100G-CR2
name is 
part number is 
revision is A
serial number is 
nominal bitrate is 25500 MBit/sec per channel
Link length supported for copper is 1 m
cisco id is 17
cisco extended id number is 0

DOM is not supported

[marce1000]

  - Start by examining the logs on the nexus when attempting to make a connection (and or other connections)

 M.

[marce1000]

       - Also checkout : https://tools.cisco.com/bugsearch/bug/CSCwe97510

   M.

[tim20110612]

Hello Marce,

Thank you for your advice and help. I followed your advice and did the following operations

1. Used the Breakout command on interface 1/29:
interface breakout module 1 port 29 map 100g-4x
Interface 29 was divided into 1/29/1, 1/29/2, 1/29/3, 1/29/4

2. I inserted the 4x QSFP56 100G branch into interfaces 1/31, 1/32, 1/33, and 1/34, but in order to better observe the logs, only interface 1/31 was opened.

3. Then I turned off auto-negotiation with the following command:
interface Ethernet1/29/1
speed 100000
no negotiate auto
no shutdown

interface Ethernet1/29/2
speed 100000
no negotiate auto
no shutdown

interface Ethernet1/29/3
speed 100000
no negotiate auto
no shutdown

interface Ethernet1/29/4
speed 100000
no negotiate auto
no shutdown

interface Ethernet1/31
speed 100000
no negotiate auto
no shutdown

When I turned on the interface, the following log appeared, there were no other messages, the interface would not light up green, and the negotiation seemed to be stopped:

2024 Aug 21 18:46:38 N9K-93600 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/31, hardware type changed to 100G
2024 Aug 21 18:46:39 N9K-93600 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/29/1, hardware type changed to 100 Gbps 2024 Aug 21 18:46:39 N9K-93600 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/29/2, hardware type changed to 100 Gbps 2 024 Aug 21 18:46:39 N9K-93600 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/29/3, hardware type changed to 100 Gbps 2024 Aug 21 18:46:39 N9K-93600 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/29/4, hardware type changed to 10 0 Gbps

When I turned on negotiate auto on 1/29/1 and 1/31, the log was exactly the same as when negotiate auto was turned off, and it seemed that negotiation had stopped:

2024 Aug 21 18:44:58 N9K-93600 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/29/1,
hardware type changed to 100 Gbps
2024 Aug 21 18:44:58 N9K-93600 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/29/2,
hardware type changed to 100 Gbps
2024 Aug 21 18:44:58 N9K-93600 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/29/3,
hardware type changed to 100 Gbps
2024 Aug 21 18:44:58 N9K-93600 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/29/4,
hardware type changed to 100 Gbps
2024 Aug 21 18:45:00 N9K-93600 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/31, h
ardware type changed to 100G

I checked the UP process of the 1-to-1 100GBase-CR2 that can UP as follows. They negotiated more things, resulting in the interface being able to UP:

2024 Aug 21 18:48:28 N9K-93600 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/35, h
ardware type changed to 100G
2024 Aug 21 18:48:30 N9K-93600 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/36, hardware type changed to 100G 2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-SPEED: Interface Ethernet1/35, operational speed changed to 100 Gbps 2024 Aug 21 18:48:33 N9K-93 600 %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/35, ope rational duplex mode changed to Full 2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet 1/35, operational Receive Flow Control state changed to off 2024 Aug 21 18:48:33 N9K -93600 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet 1/35, operational Transmit Flow Control state changed to off 2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-SPEED: Interface Ethernet1/36, operational speed changed to 100 Gbps 2024 Aug 21 18:48:33 N9K -93600 %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/36, operational Receive Flow Control state changed to off 2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet 1/36, operational Receive Flow Control state changed to off N9K-93600 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet 1/36, operational Transmit Flow Control state changed to off 2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-IF_UP: Interface Ethernet1/35 is up in Layer3 2024 Aug 21 18:48:33 N9K-93600 % ETHPORT-5-IF_UP: Interface Ethernet1/36 is up in Layer3

Can you help me? Thanks!

[tim20110612]

Sorry,

I'll split the last paragraph into lines so it's clearer:

1-to-1 100GBase-CR2 that can UP as follows. They negotiated more things, resulting in the interface being able to UP:

2024 Aug 21 18:48:28 N9K-93600 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/35, hardware type changed to 100G

2024 Aug 21 18:48:30 N9K-93600 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/36, hardware type changed to 100G

2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-SPEED: Interface Ethernet1/35, operational speed changed to 100 Gbps

2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/35, operational duplex mode changed to Full

2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet
1/35, operational Receive Flow Control state changed to off

2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet
1/35, operational Transmit Flow Control state changed to off

2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-SPEED: Interface Ethernet1/36, operational speed changed to 100 Gbps

2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/36, operational duplex mode changed to Full

2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/36, operational Receive Flow Control state changed to off

2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/36, operational Transmit Flow Control state changed to off

2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-IF_UP: Interface Ethernet1/35 is up in
Layer3

2024 Aug 21 18:48:33 N9K-93600 %ETHPORT-5-IF_UP: Interface Ethernet1/36 is up in
Layer3

[marce1000]

 -To what kind of other equipment are these connections being made ?

M.

[tim20110612]

Hello Marce,

I connected the QSFPDD 400G end and QSFP56 100G end to different interfaces of N9K-C93600CD-GX at the same time

e1/29 ----- QSFPDD 400G end, Breakout mode 100g-4x

e1/31, e1/32, e1/33, e1/34 ----- 4x QSFP56 100G end

[Dawei]

Which version are you currently running? Could you please try upgrading to NX-OS 10.4(3)F or a later version?

[tim20110612]

Hello Dawei,

Thank you for your help. I used NX-OS 10.4(3)F at first, but the link could not be UP.

I later upgraded to the latest version of NX-OS 10.5(1)F, but the link still could not be UP.

However, the Cisco Optics Compatibility Matrix claims that N9K-C93600CD-GX supports QSFPDD 400G to 4x QSFP56 100G Passive DAC since NX-OS 10.4(3)F
https://tmgmatrix.cisco.com/tmg?tpid=2504

I am a little confused. . .

[marce1000]

          - I would certainly create a TAC case for this , 

 M.

[tim20110612]

Hello Marce,

Thank you for your help. Any information would be greatly appreciated!