Re: [ovs-discuss] Problem on OpenVSwitch 2.9

[woz woz]

Dear Ben,

thanks for the support!

I receive the error on two servers C & D, below the command outputs:

[root@C ~]# ovs-dpctl show
system@ovs-system:
lookups: hit:283639 missed:348 lost:0
flows: 14
masks: hit:1027059 total:3 hit/pkt:3.62
port 0: ovs-system (internal)
port 1: ovsbr0 (internal)
port 2: enp4s0
port 3: tep0 (internal)
port 4: vxlan_sys_4789 (vxlan: packet_type=ptap)

[root@D ~]# ovs-dpctl show
system@ovs-system:
lookups: hit:230545 missed:378 lost:0
flows: 12
masks: hit:707437 total:2 hit/pkt:3.06
port 0: ovs-system (internal)
port 1: ovsbr0 (internal)
port 2: enp4s0
port 3: tep0 (internal)
port 4: vxlan_sys_4789 (vxlan: packet_type=ptap)

Thanks in advance,

Cheers,

Woz


On 7 March 2018 at 21:02, Ben Pfaff  wrote:

> On Wed, Mar 07, 2018 at 11:47:48AM +0100, woz woz wrote:
> > Dear support,
> > I’m testing OpenVSwitch version 2.9. on my infrastructure using CentOS7,
> > but I’m having any problem, below my config:
> > I have 4 servers with the public IP address, e.g.
> > A-> 1.1.1.1
> > B-> 2.2.2.2
> > C-> 3.3.3.3
> > D-> 4.4.4.4
> > between these servers I've configured a VXLAN tunnel, in this way :
> > the server named A has a VXLAN tunnel with C and D
> > the server named B has a VXLAN tunnel with C and D
> > the servers named C and D obviously have a tunnel with A and B
> > I executed this kind of configuration because I would like to have a
> > redundancy between the servers A and B , e.g if A goes down I migrate all
> > the services on B and the servers C and D can continue to work without
> any
> > problem.
> > But I have the following messages on the /var/log/message :
> > "kernel: openvswitch: ovs: recursion limit reached on datapath
> ovs-system,
> > probable configuration error”
> >
> > I 've read articles related to this kind of problem and I played also
> with
> > the STP protocol in order to avoid a possible loop but I don't understand
> > if I can use this configuration or I have to find another solution.
>
> This message wouldn't be caused by a loop among servers but some kind of
> configuration problem on an individual server.  When you see this
> message, what is in the kernel flow table ("ovs-dpctl dump-flows") and
> what ports are configured ("ovs-dpctl show")?
>
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Re: [ovs-discuss] Problem on OpenVSwitch 2.9

[Ben Pfaff]

On Wed, Mar 07, 2018 at 11:47:48AM +0100, woz woz wrote:
> Dear support,
> I’m testing OpenVSwitch version 2.9. on my infrastructure using CentOS7,
> but I’m having any problem, below my config:
> I have 4 servers with the public IP address, e.g.
> A-> 1.1.1.1
> B-> 2.2.2.2
> C-> 3.3.3.3
> D-> 4.4.4.4
> between these servers I've configured a VXLAN tunnel, in this way :
> the server named A has a VXLAN tunnel with C and D
> the server named B has a VXLAN tunnel with C and D
> the servers named C and D obviously have a tunnel with A and B
> I executed this kind of configuration because I would like to have a
> redundancy between the servers A and B , e.g if A goes down I migrate all
> the services on B and the servers C and D can continue to work without any
> problem.
> But I have the following messages on the /var/log/message :
> "kernel: openvswitch: ovs: recursion limit reached on datapath ovs-system,
> probable configuration error”
> 
> I 've read articles related to this kind of problem and I played also with
> the STP protocol in order to avoid a possible loop but I don't understand
> if I can use this configuration or I have to find another solution.

This message wouldn't be caused by a loop among servers but some kind of
configuration problem on an individual server.  When you see this
message, what is in the kernel flow table ("ovs-dpctl dump-flows") and
what ports are configured ("ovs-dpctl show")?
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