Open Stack

It's a bit hard to parse a network topology by email, but from a
theoretical point of view - you can statically route a /24 towards the
external IP of an openstack router from a device upstream.

I do believe there is a BGP component for Openstack but I'm not sure it's
role is to dynamically advertised networks from Openstack towards the wider
network.

On Thu, Feb 4, 2021 at 11:45 AM <DHilsbos at performair.com> wrote:

> All;
>
> My team and I have been working through the tutorials on Server World (
> server-world.com/ean/), in order to learn and build an OpenStack
> cluster.  We've also been looking at the official documentation to attempt
> to increase our knowledge of the subject.
>
> I have a question about Neutron though.  All the examples that I remember
> have Neutron setup with a single router.  The router is part of a
> "provider" network, and subnet on the outside, and one or more "tenant"
> networks on the inside.  Floating IPS, then appear to be IP addresses
> belonging to the "provider" subnet, that are applied to the router, and
> which the router then NATs.
>
> These setups look like this:
>
> Physrouter1 (physical router) subnet: 192.168.0.0/24, IP address:
> 192.168.0.1
> |
> Physnet1 (192.168.0.0/24)(ovs network definition)
> |
> Router1 (ovs router)(allocation pool: 192.168.0.100 - 192.168.0.254) <--
> Floating IPs are "owned" by this, and are in the range of the allocation
> pool
> |
> Tenant network(s)
>
> This has the advantage of being easy, fast, secure, and simple to setup.
>
> What if you wanted something where you could route whole subnet into your
> OpenStack cluster.
>
> Physrouter1 (physical router) subnet: 172.16.255.0/24, IP address:
> 172.16.255.1
> |
> Physnet1 (172.16.255.0/24)(ovs network definition)
> |
> Router1 (ovs router)(fixed IP addresses: 172.16.255.2 & 172.16.254.1/24 +
> static / dynamic routing)
> |
> Network (17216.254.0/24)
> |
> Router2(ovs router)(allocation pool: 172.16.254.5 - 172.16.254.254) <--
> Floating IPs are "owned" by this, and are in the range of the allocation
> pool
> |
> Tenant network(s)
>
> Is my understanding accurate?
> Are there advantages of one over the other?
> What commands are used to specify static IPs for ovs routers, and static
> routing rules?
>
> Thank you,
>
> Dominic L. Hilsbos, MBA
> Director - Information Technology
> Perform Air International Inc.
> DHilsbos at PerformAir.com
> www.PerformAir.com
>
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack-discuss/attachments/20210204/41abf04b/attachment.html>