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I have a 6 server setup. Each server has 4 NICs with port channeling setup to my switch for redundancy and speed. My question is simply: Can kubernetes handle this without the port channeling? Or should I stay with the port channeling?

So if I do not use port-channeling:

  1. Can kubernetes benefit by 4 NICs speedwise when communicating between servers?
  2. If one NIC breaks, will kubernetes handle all traffic over the working NICs automatically?
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It doesn't matter for kubernetes what kind of backend network you have: it works on top of existing OS interfaces.

Kubernetes expects you give it a reliable and fault tolerance network, hence if your hosts are communicating each other with all 4 NICs, Kubernetes will do that too.

If you don't use port channeling, then you have to avoid network loop; for example by using STP or a bonding algorithm like round-robin or active/passive. So answers are:

  1. Depends on your network setup at OS level.
  2. Not Kubernetes itself but the OS do the job.

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