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Supported networking plugins in OpenShift 4



Hello there,

I am curious to see what are the plans with regards to integrate third party SDN plugins, as it seems from OCP4 there's only one option, OpenShift SDN.

I am in the process of taking a decision on a big SaaS player, so far these are the pros and cons between VXLAN and BGP.

# OpenShift default SDN Pluggin
# Pros
1) Simple to Install.

# Cons
1) VXLAN will use CPU Cycles. It will Increase CPU usage on the host, and high CPU usage will cause network performance to drop.

2) There should be no reason or need to run an overlay between 2 VMs in the same Hypervisor, or between 2 Hypervisors in the same Rack, or between any two points inside a Datacenter to be honest, unless really needed.

3) Difficult to troubleshoot

4) VXLAN is in essence will be a big Layer2 Domain, if we scale we will exhaust the ARP table of those VMs. It can be increased, but how much?

# Pure Layer3 (With Calico, or any other CNI Plugin).
# Pros

1) Won't have any of the Cons listed for OpensShift SDN;
2) Real, routable IP address on the Containers;
3) Anyone with networking knowledge can troubleshoot a Networking Connectivity issue that a Container may have, they will be seen as any other VM or Baremetal from a Networking/Troubleshoot perspective;
4) BGP is well known by any Network Operator, even without OCP/K8s/Calico knowledge a NetOps with BGP knowledge will be able to understand the setup;
5) BGP allow us to apply upstream policies if we want, based on Communities.

# Cons
1) Slightly more complex to Install than default SDN Plugin.
2) RH may not support issues on calico itself if we have issues, but Calico has support trough the Tigera Project (which also deliveries other cool stuff for networking visibility at containers level).

Any advice, correction, suggestion or any clue about networking roadmap would be highly appreciated.

Thanks for reading,

Regards,
 



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