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| openstackgerrit | ZongKai LI proposed openstack/networking-ovn: Get information of Chassis from OVN SB DB https://review.openstack.org/302623 | 08:25 |
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| openstackgerrit | garyk proposed openstack/networking-ovn: Use constants from neutron-lib https://review.openstack.org/304088 | 12:21 |
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| numan_ | Hello everyone, for the native dhcp support in networking-ovn, is it good to provide configuration option to use native dhcp or to use dhcp agent ? any thoughts | 14:08 |
| Sam-I-Am | numan_: users should be able to choose one or the other | 14:08 |
| Sam-I-Am | this helps with migration too | 14:08 |
| numan_ | Sam-I-Am, ok | 14:09 |
| numan_ | even i think its good to have an option like we have for native l3 | 14:09 |
| Sam-I-Am | yes | 14:09 |
| Sam-I-Am | not something you want turning on by itself one day | 14:09 |
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| numan_ | ok | 14:10 |
| numan_ | russellb, mestery you have any comments on this. | 14:10 |
| russellb | yes, i think an option is helpful for now at least | 14:11 |
| russellb | i suspect some day we may get to where we just remove the option | 14:12 |
| russellb | same with L3 | 14:12 |
| numan_ | ok. | 14:12 |
| russellb | but an option for now sounds good | 14:12 |
| numan_ | thanks. | 14:13 |
| russellb | for example, I don't think we have an answer for how metadata API support will work with native DHCP yet | 14:13 |
| russellb | so that's a minor reason to keep the old support for now | 14:13 |
| russellb | also for testing, switching back and forth while it's still new ... | 14:13 |
| russellb | numan_: thanks :) | 14:13 |
| numan_ | sure. thanks for the comment russellb | 14:13 |
| numan_ | russellb, just one more thing on the ovn-northd side, is it fine to skip acl stages for dhcp traffic. you have any thoughts on that | 14:14 |
| russellb | good question | 14:15 |
| numan_ | russellb, with my testing i am seeing an issue where in when the dhcp packet is resumed by vswitchd its going through acl stage | 14:15 |
| numan_ | and the packet is getting dropped. i see some warn in vswithd | 14:15 |
| numan_ | looks like the datapath port number is 0 when the packet is received from kernel/connection tracking module. | 14:16 |
| numan_ | i will send out an email to the ML about the issue. | 14:17 |
| russellb | you may have hit a bug, | 14:17 |
| russellb | yes | 14:17 |
| russellb | i'm not sure i have a strong opinion about doing DHCP before or after ACLs | 14:17 |
| numan_ | but i think it should be fine to skip acl stage for dhcp | 14:17 |
| numan_ | ok | 14:17 |
| russellb | can you disable dhcp on a per port basis otherwise? | 14:17 |
| russellb | that's the only case i can really think of ... | 14:18 |
| russellb | maybe you only want to allow DHCP requests from some subset of ports | 14:18 |
| numan_ | yes. i just tested with one approach where CMS can disable dhcp for port by defining "dhcp_disabled=true" in the options field | 14:18 |
| russellb | ok, if you have that, then I don't think ACLs are important | 14:19 |
| russellb | but if I had to pick, I'd probably expect ACLs to still apply to this traffic | 14:20 |
| russellb | (sorry thinking out loud here) | 14:20 |
| russellb | even if we can't figure out why it's useful, it just seems like ACLs should apply to all traffic | 14:20 |
| russellb | unless there's some particular reason it can't work ... it can always be changed later too | 14:21 |
| russellb | ¯\_(ツ)_/¯ | 14:21 |
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| numan_ | ok. i guess in order to have acl for dhcp, the bug needs to be addressed in vswitchd :) | 14:21 |
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| dlevy | Can someone explain the difference between the flow table in ovn-db (ovn-sbctl dump-flows) and ovs-db(sudo ovs-ofctl dump-flows br-int)? Is the ovn-db flow table just a SUBSET of ovs-dbs table? i.e the ovs-db table translates the info, then adds more local flows? | 15:48 |
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| russellb | dlevy: hello | 16:01 |
| russellb | dlevy: the flow table in the OVN southbound database is "logical flows" | 16:01 |
| russellb | logical flows describe the network purely in terms of logical constructs, which are completely independent of what hypervisors exist and what ports exist on which hypervisor | 16:02 |
| russellb | dlevy: ovn-controller on each hypervisor takes the logical flows and translates them into OpenFlow flows appropriate for the local hypervisor, which requires knowledge of the location of all logical network elements | 16:02 |
| dlevy | Thanks Russell, that makes sense | 16:03 |
| russellb | logical flows are a higher level abstraction | 16:03 |
| russellb | np | 16:03 |
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| openstackgerrit | Merged openstack/networking-ovn: Use constants from neutron-lib https://review.openstack.org/304088 | 17:34 |
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