Description of problem:

A very common use-case in egressip via secondary interfaces is to ensure that application pods assigned to the egressip leave out the RHCOS nodes using the 'secondary' default route assigned to the secondary interface. 

It is documented on this solution. It is also documented on OVN-Kubernetes docs . A bug has been opened in the past to discuss it.

However, this option is not documented in docs.redhat.com. I am raising this documentation bug to consider to include this option as oficially documented in OCP documentation as customers are looking for this well documented and not available in any solution.

In summary, the idea is to document properly in OCP documentation how to configure egressip on secondary interface and ensure that the application pods leave out the RHCOS nodes using the secondary default configured.

Version-Release number of selected component (if applicable):

How reproducible: Very easy to reproduce