Use a Node's primary NIC as the secondary OVS bridge physical interface

[jianjuns]

Describe the problem/challenge you have
In Antrea VLAN secondary network support (#5278), we require a separate NIC for the secondary OVS bridge's physical interface. However, it is quite common a K8s Node has only one NIC. So, the ask is to support using a Node's primary NIC (which is also the Antrea overlay network's transport interface) as the secondary bridge's physical interface.

Describe the solution you'd like
When a Node interface is configured for the secondary bridge, antrea-agent should move its IP addresses and routes to the secondary bridge after connecting the interface to the bridge, and it should also retore the IPs and routes before exits.

Moving an interface and its IPs/routes to an OVS bridge may not be compatible with all host network configurations and may not work well with other network managers.

[jianjuns]

@meibensteiner create this issue to track your requirement.

[github-actions]

This issue is stale because it has been open 90 days with no activity. Remove stale label or comment, or this will be closed in 90 days

[meibensteiner]

I would appreciate it if this was implemented at some point. :)

[jianjuns]

I would appreciate it if this was implemented at some point. :)

Yes, we plan to support it in this release. @aroradaman is working on it.

[meibensteiner]

Awesome. @aroradaman Id love to test it :)

[aroradaman]

/assign