Hello Han:

If you are trying to create a bond, you'll need to perform that operation inside the VM. The problem, at least for ML2/OVS and ML2/OVN, is that the traffic egressing from this interface won't match the MAC address configured. This traffic will be dropped because of the ARP spoofing rules unless you disable "port_security_enabled". I'm not sure (I've never tested) if LACP mode will work in these backends. In any case, what is the user case? Isn't it better to make this bond in the host interfaces? [1]

The IP allocation of a port is something that cannot be manually set. This value will depend on the DHCP configuration:

If the network has a subnet, the Neutron server will try to assign an IP. If you don't have routed provider network, the value will be "immediate"
For routed provider networks (that I don't think is your case), the value will be "deferred" and will depend on the host the port is bound.
If you choose --no-fixed-ip when creating the port, the value will be "none".

The functionality you are looking for was implemented in Nova in [2], but this is available in Yoga, not in Victoria. This feature allows you to create an IP-less port and use it to spawn a VM.

Regards.

[1]https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/16.2/html/advanced_overcloud_customization/assembly_network-interface-bonding

[2]https://review.opendev.org/c/openstack/nova/+/669411

On Wed, Apr 19, 2023 at 4:27 PM 韩光宇 <hanguangyu2@gmail.com> wrote:

Hello,

I have a victoria cluster. I am a bit perplexed about OpenStack
networking and was wondering if you could enlighten me on the topic.

1. bond
When configuring bond interfaces (bond0/1/2/3) in an OpenStack
instance, can I follow the same steps as I would on a physical
machine? Are there any particular considerations to keep in mind?
Also, when it comes to switch configuration, do I configure virtual
machine switches directly or are there specific OpenStack interfaces
to use?

2.
`openstack port create --network net1 --no-fixed-ip port_net1`
I was able to obtain a port with an ip_allocation value of "none"
using the above command. I noticed that the ip_allocation value can be
set to "none", "deferred", or "immediate". Is there a CLI interface to
modify the ip_allocation value of a port, for example, changing "none"
to "deferred"? Alternatively, what is the recommended method to make
this change?

3.
Is it possible for users to set IP addresses within an instance
system? For example, if I create an instance without an IP address, is
there a mechanism that allows me to set an IP address within the
instance system, or can I only modify the port bindings or switch
ports externally to change the IP address of an instance?

Thank you for your attention to this matter.
Best regards,
Han Guangyu