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  1. Fast Datapath Product
  2. FDP-1719

CLONE [ovn26.03 fast-datapath-rhel-9] - DVR + VLAN Tenant Network + reside_on_redirect_chassis False . Connectivity issue to external network

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    • Resolution: Unresolved
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    • ovn26.03
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      Given a DVR topology with a tenant VLAN LS routed to a provider LS and the router’s reside_on_redirect_chassis=false,

      When a packet from a tenant VM to a provider VM egresses br-ex,

      Then the controller loads router datapath metadata, the pipeline keeps outport = provider VM LSP, and the packet is forwarded.

      Show
      Given a DVR topology with a tenant VLAN LS routed to a provider LS and the router’s reside_on_redirect_chassis=false, When a packet from a tenant VM to a provider VM egresses br-ex, Then the controller loads router datapath metadata, the pipeline keeps outport = provider VM LSP, and the packet is forwarded.
    • ovn26.03-26.03.0-alpha.52.el9fdp
    • rhel-9
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    • rhel-net-ovn
    • ssg_networking

      We are not able to establish communication to a VM on the external network from a VM on a VLAN tenant network. The tenant and external network are routed via a OVN router with reside-on-redirect-chassis = "false"

      I this point I am not sure if we are missing some OVN configuration or if there is a bug in OVN. I read an old email from Numan about the reside-on-redirect-chassis config and I think we are configuring this setup correctly. I.e. we set it to false such that traffic to the external network is not centralized through a GW chassis.

      Here is a diagram showing the topology in question. In this diagram the VM2 (VLAN tenant network IP 192.0.2.7) should be able to communicate with the VM-Public(Public network IP 10.0.0.248).

      I am attaching OVN DBs, ovn-trace of a ICMP ping from a tenant VM(vm2) to the external VM (vm-public) and `ovn-sbctl list lflow <router>` output from this setup

      Tested on OVN 24.03
       

              mmichelson Mark Michelson
              ovnteam@redhat.com OVN Team
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                Created:
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