Using MTP to LC breakout cable with VC FF Module

[Danil_N]

Hi all,

We have several c7000 with VC FlexFabric-20/40 F8 Modules connected to our Cisco NEXUS switches, currently an 40G to 4x10G AOC cables(721076-B21) is used for this. Due to the server room move, we want to replace the AOC cables with MTP to 4xLC breakout cables.

However, when we try to connect the c7000 in this way, the link is not established. In the VC WebUI, the status of the Qx.1 QSFP port will be displayed as "Not linked", and the status of Qx.2-Qx.4 ports as "Covered".

Has anyone had experience with this type of connection? Perhaps additional configuration of VC is needed?

Best Regard,

Danil

[TVVJ]

Hello,

You may refer to the community post title "QSFP on VC FlexFabric-20/40 F8 not operational" and see if it helps.

Regards,

[Danil_N]

@TVVJ 

Hello,

Thanks for the answer.

Unfortunately, the advice from the post didn't help us, we tried various options for speed settings and port negotiation, but without success.

However, the direct connection QSFP - MTP cable - QSFP works fine out of the box, but unfortunately this option doesn't suit us.

It seems that this VC module doesn't support working with this type of connection at all.

Best Regards,

Danil

[Vinky_99]

@Danil_N 

Hello Danil,

Good day!

I would suggest you consider the below instructions, I hope it helps:

>> Ensure that the MTP to LC breakout cables you're using are compatible with the VC FlexFabric-20/40 F8 Modules and the Cisco Nexus switches.

>> Check the VC FlexFabric module's configuration to make sure it recognizes the new connection. You may need to configure the correct port settings for the MTP to LC breakout cables. Verify that the port configuration (speed, mode, etc.) matches on both ends of the connection.

>> Double-check the cabling orientation. MTP connectors have a key that ensures proper alignment. Ensure that the MTP connector is inserted correctly into the VC FlexFabric module.

>> Ensure that the VC FlexFabric module has the latest firmware installed. Sometimes, firmware updates include fixes for compatibility issues and improve overall performance.

>> Check if there are any specific driver or firmware updates for your Cisco Nexus switches that might address compatibility issues.

>> Run link diagnostics or training on the VC FlexFabric module to see if it can establish a link with the Cisco Nexus switch.

>> Consult the documentation for both the VC FlexFabric module and the Cisco Nexus switches to ensure that you're following the recommended guidelines for cabling and configuration.

>> If the issue persists, consider reaching out to the support teams of both HPE and Cisco for assistance. They may have specific recommendations or solutions for your particular setup.

If possible, test the MTP to LC breakout cables in a smaller, controlled environment to ensure that they are functioning correctly before implementing them in the production environment.

Remember to make any changes during a maintenance window to minimize the impact on production systems. Always follow best practices and consult the documentation provided by the equipment manufacturers for accurate and specific guidance.

I hope this helps! Let me know...