[ovs-discuss] Error ovs recursion limit reached on datapath

[Heim, Dennis]

I have out of band management configured with:

ovs-vsctl set controller <bridge> connection-mode=out-of-band
ovs-vsctl set bridge <bridge> other-config:disable-in-band=true

The out of band NIC is not added to an ovs bridge. When I connect it to my openDayLight controller (v0.8.4), that is when the recursion errors show up. Running 2.5.5 (ovs), it works perfectly.

f0fc01b4-904d-407b-a3bb-03fd3e004926
    Manager "tcp:10.246.49.188:6640"
        is_connected: true
    Bridge data
        Controller "tcp:10.246.49.188:6633"
            is_connected: true
        fail_mode: secure
        Port "vlan1"
            tag: 1
            Interface "vlan1"
                type: internal
        Port "ens256"
            tag: 10
            Interface "ens256"
        Port "ens224"
            tag: 1
            Interface "ens224"
        Port "vxlan3"
            Interface "vxlan3"
                type: vxlan
                options: {key=flow, remote_ip="10.246.48.149"}
        Port data
            Interface data
                type: inte

Dennis Heim | Domain Architect (Collaboration Labs)
World Wide Technology, Inc. | +1 314-212-1814


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-----Original Message-----
From: Ben Pfaff <blp at ovn.org> 
Sent: Thursday, June 27, 2019 10:01 AM
To: Heim, Dennis <Dennis.Heim at wwt.com>
Cc: ovs-discuss at openvswitch.org
Subject: Re: [ovs-discuss] Error ovs recursion limit reached on datapath

On Thu, Jun 27, 2019 at 04:48:45AM +0000, Heim, Dennis wrote:
> Any idea what causes the error message "ovs recursion limit reached on 
> datapath"? I have the configuration working on 2.5.5, but if I run 2.9 
> or 2.11, I get that error message.

It could be a bug in OVS or it could be an OpenFlow flow table that does something odd, for example, recursively executing connection tracking or tunneling from a system to itself.  You might be able to track it down by looking at the kernel flows with "ovs-dpctl dump-flows" or by tracing microflows or packets with "ovs-appctl ofproto/trace".