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| ygk_12345 | Hi all | 10:31 |
|---|---|---|
| ygk_12345 | can someone explain me what exactly is a gateway in OVN architecture ? is it not the same as logical router ? | 10:31 |
| ygk_12345 | also what is gateway router ? | 10:33 |
| ygk_12345 | i am confused a bit from the man page of ovn architecture | 10:33 |
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| tryauuum | (silly question ahead) is there a way in OVN to add a static route with a custom priority? e.g. I want to add route "192.168.0.0/20 via 176.16.32.32". But it won't affect my traffic, since I have "172.16.32.4/32 78.40.216.1 src-ip network-01479963107640fdaefa5ec24316c4c1-to-public-switch" route already on this router | 14:27 |
| tryauuum | (and without ^ this route, dnat_and_snat won't function correctly) | 14:28 |
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| ygk_12345 | is anyone here familiar with OVN ? | 15:30 |
| ygk_12345 | I have some queries regarding OVN | 15:30 |
| ygk_12345 | can anyone help me please ? | 15:31 |
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| flaviof | tryauuum: did you try using https://www.ovn.org/support/dist-docs/ovn-nb.5.html --> Logical_Router_Static_Route TABLE ? it uses longest prefix match (lpm), so I wonder if that could be useful. | 15:34 |
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| flaviof | ygk_12345: ovn gateway normally is referred as the logical router that has a port used to connect to an external network. So it normally allows for nat (dsnat + snat). That way that is accomplished is by having a node set with the cmos option | 15:37 |
| flaviof | ovs-vsctl set Open_vSwitch . external-ids:ovn-cms-options="enable-chassis-as-gw" | 15:37 |
| ygk_12345 | actually my first query is this. why would people connect logical networks like tenant networks in openstack to the external or provider networks ? if so they could have used provider networks in the first place ? | 15:40 |
| ygk_12345 | is it only due to internet connectivity ? | 15:40 |
| ygk_12345 | so is not the above a definition of a gateway in OVN ? | 15:41 |
| ygk_12345 | a l3 logical router I mean in openstack ? | 15:41 |
| flaviof | ygk_12345: normally provider networks is what gives tenants access to external networks (i.e internet) | 15:41 |
| ygk_12345 | so a l3 openstack virtual router is an example of a gateway in OVN. am I right ? | 15:42 |
| flaviof | yes, an ovn logical router is used as a "router" on openstack. keep in mind ovn is not used only in openstack | 15:42 |
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| ygk_1234578 | my next question is, what is the difference between a gateway physical port and a underlay physical port ? | 15:44 |
| flaviof | you can think of it that way, yes. ovn gateway router is just an ovn router that has a port that connects to the provider network. | 15:44 |
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| flaviof | ygk_1234578: hmm... not sure I understand "underlay physical port". | 15:48 |
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| ygk_12345 | In the following link "https://www.ovn.org/support/dist-docs/ovn-architecture.7.pdf", under the section "Chassis Setup", it is stated, "Other ports should not be attached to the integration bridge. In particular, physical ports attached to the underlay network (as opposed to gateway ports, which are physical ports attached to logical networks) must | 15:54 |
| ygk_12345 | not be attached to the integration bridge. Underlay physical ports should instead be attached to a separate Open vSwitch bridge (they need not be attached to any bridge at all, in fact)". | 15:54 |
| ygk_12345 | My question is, what are the differences between gateway physical ports and underlay physical ports ? | 15:54 |
| ygk_12345 | flaviof did u get my question ? | 15:54 |
| ygk_12345 | the above question I mean | 15:55 |
| ygk_12345 | i will try to explain it more clearly if not | 15:55 |
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| flaviof | ygk_12345 ah, ok. I was missing out on the context. Yes, the integration bridge (br-int) is used in ovn as the place where all non-external ports are added. For external access, ovn will create patch ports to the external bridges, based on the ovn-bridge-mappings. More on that is documented in that link you just mentioned (look for Native OVN services for external logical ports) | 16:59 |
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