Wednesday, 2019-08-07

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DHEIs there an openstack service (or neutron extension, or whatever) that can take an external layer 2 vlan (802.1q) and bridge it to an openstack vxlan-tunneled network?13:41
DHEI guess that means I'm looking for a software vtep, but something that openstack can manage/control happily13:41
DHE(right now I'm on openvswitch, a decision I'm regretting because it doesn't support multicast groups for VXLAN-tunnel broadcast packets)13:42
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willksmDHE - "To get around the lack of multicast support, it is possible to pre-provision MAC to IP address mappings either manually or from a controller."13:45
DHEyes but that's openvswitch talking, and the controller is neutron itself13:46
factorDHE: The newest Openvswitch does handle that though, I think.Since its using the Geneve.13:47
DHEbut that's not vxlan... right?13:49
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DHEI am kinda trying to shoehorn something into my existing setup, not ideal either way...13:49
factorDHE:Geneve is designed to encapsulate anything.13:50
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factorDHE: WIll have to look up how that actually works.13:51
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factorDHE, Was reading over the newest OpenVswitch information v2.12 does have vtep-ctl for handling multicast.14:40
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DHEoh? I go check14:42
DHE2.12 isn't listed on their download page14:43
factorhttp://docs.openvswitch.org/en/latest/howto/vtep/14:43
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factorSimulating an NVC14:43
DHEwell openstack (neutron) already operates as an openflow controller and configures the openvswitch bridges as it needs to. I feel like this would risk conflicting14:45
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DHEthat's my main aversion to this, and why I'm looking for an openstack-sanctioned solution14:46
factorDHE, it probably would , but getting Openstack to use it.14:47
factorRight14:47
factorBut it is possible , not out of the question.14:47
DHEsure, but "doing it right" probably means discarding the openvswitch config and trying the kernel vxlan driver + linux bridging. and I'm not a fan of linux bridging14:47
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factorNor I14:48
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jrosserDHE: i don't know what you're trying to achieve but i bought an external L2 network in using hardware VTEP on my switches, de-encapsulating at the TOR and dropping down on a .1q trunk to the computes and neturon nodes14:49
jrosserthen set it up as a regular vlan provider net in neutron and a bunch of this goes away14:50
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DHEjrosser: I want the opposite. My openstack environment is physically small (1 rack, some expansion planned). I have layer 2 networks external to this coming in, but want layer 3 only within the openstack cluster14:53
jrosserthats exactly what i have really14:53
jrosseri L3 fabric and a need to bring an external L2 network in14:53
jrosserbut i make it look like a vlan to neutron, and do all the vxlan myself in the switches14:54
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jrosserfor all the reasons you describe up there ^^^14:54
DHEugh, this is a nightmare...14:55
jrosserand if you need to know/control the VNI you don't really have a choice other than a provider network14:55
jrosseryes, exactly, which is why i made neutron do as little of this as possible14:55
jrosserit thinks its just dealing with a regular vlan14:55
DHEright now I have 2 types of network: provider networks as plain old 802.1q, and tenant networks as vxlan, both openvswitch managed. I want to simplify and improve redundancy (dual NIC servers, etc).14:56
DHEI am starting to think I don't know what I really want in the end14:56
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jrossermine is similar14:58
jrosserl2 networks for floating IP and so on are L2 vlan presented to neutron nodes as VPC/MLAG whatever you want to call it14:59
jrossertenant nets are vxlan14:59
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jrosserand i magic up these "special" l2 external networks whuch need to go direct to computes as vlan provider networks, transported in hardware VTEP VXLAN over leaf/spine l3 fabric15:01
jrosserand yes, it is ugly, but i don't know of a better way15:01
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DHEwell I don't have vtep switches (yet) and all my 802.1q provider networks just have port security disabled15:11
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jrosserthere are probably other ways to dela with it tbh15:21
jrosserbut i needed wire speed to the compute nodes which rules out software vtep15:21
jrosserand also i wanted to avoid any special neutron<>switch vendor integration which might be poorly supported15:22
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jrosserso i guess i'm saying match your approach to your use case, really15:23
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