From: "Gianluca Cecchi" <gianluca.cecchi@gmail.com> To: "Marcin Mirecki" <mmirecki@redhat.com> Cc: "Ovirt Users" <users@ovirt.org> Sent: Thursday, February 16, 2017 4:40:46 AM Subject: Re: [ovirt-users] questions on OVN
On Thu, Feb 16, 2017 at 9:54 AM, Marcin Mirecki < mmirecki@redhat.com > wrote:
OVN is aleady using GENEVE, VXLAN or STT tunnels (the user can choose any), so the isolation is already assured. The scripts provided by ovirt configure a geneve tunnel. You are free so override this manually to vxlan or stt if you want, let me know if you need any howto info.
A small correction/clarification: for hypervisor-hypervisor tunnels, the only tunnel encapsulations that are currently supported are GENEVE and STT. The rationale is explained in detail at http://openvswitch.org/support/dist-docs/ovn-architecture.7.html in the "Design Decisions" section. VXLAN tunnels are supported for hypervisor-gateway tunnels only.
yes, please. I have used in the mean time the vdsm-tool command that takes care of creating the default geneve tunnel In my case vdsm-tool ovn-config 10.4.168.80 10.4.168.81
but I would like to know how to manually use other types too. I watched the deep dive demo about ovn but at the bottom of the related slide there are three lines that should be equivalent to the above command, something like
ovs-vsctl set open ? external-ids:ovn-remote=tcp: 10.4.168.80:6642 ovs-vsctl set open ? external-ids:ovn-encap=type=geneve ovs-vsctl set open ? external-ids:ovn-encap-ip=10.4.168.81
The ? character seems a dot or a comma, I have not understood the syntax.... (what are the accepted words for type= in the second line?)
The syntax here is "ovs-vsctl set <table> <record> <column>[:<key>]=<value>...". In this case, the table name is "Open_vSwitch", "open" can be used as a shorthand because the table name is not case-sensitive and prefixes of the table name are accepted as long as they are unique. The "." character specifies the record name as explained in the ovs-vsctl man page at http://openvswitch.org/support/dist-docs-2.5/ovs-vsctl.8.txt: Open_vSwitch Global configuration for an ovs-vswitchd. This table contains exactly one record, identified by specifying . as the record name. Valid settings for external-ids:ovn-encap-type= are given in the ovn-controller man page http://openvswitch.org/support/dist-docs-2.5/ovn-controller.8.txt: external_ids:ovn-encap-type The encapsulation type that a chassis should use to con‐ nect to this node. Multiple encapsulation types may be specified with a comma-separated list. Each listed encapsulation type will be paired with ovn-encap-ip. Supported tunnel types for connecting hypervisors are geneve and stt. Gateways may use geneve, vxlan, or stt. Due to the limited amount of metadata in vxlan, the capa‐ bilities and performance of connected gateways will be reduced versus other tunnel formats. Hope this helps, Lance
Thanks again, Gianluca
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