ovs-appctl ofproto/trace vmbr0 thinks the bridge name is missing...

[linum]

I tried to debug an ARP issue and want to use the command

ovs-appctl ofproto/trace vmbr0

as described here. But the command failed with:

root@xxx:~# ovs-vsctl --version
ovs-vsctl (Open vSwitch) 3.1.0
DB Schema 8.3.1
root@xxx:~# ovs-appctl ofproto/trace vmbr0
syntax error at vmbr0 (or the bridge name was omitted)
ovs-appctl: ovs-vswitchd: server returned an error

Anyone an idea what I'm doing wrong?

pveversion
pve-manager/8.0.3/bbf3993334bfa916 (running kernel: 6.2.16-3-pve)

 

[Vlodek]

Hi,

command ovs-appctl

# ovs-appctl list-commands|grep ofproto/trace

ofproto/trace  {[dp_name] odp_flow | bridge br_flow} [OPTIONS...] [-generate|packet]

needs two arguments.

Look at
https://docs.openvswitch.org/en/latest/topics/tracing/

where command

$ ovs-appctl ofproto/trace br0 in_port=3,tcp,nw_src=192.0.2.2,tcp_dst=22

is explain as

The first line is the trace command. The br0 is the bridge where the packet is going through.
The next arguments describe the packet itself. For instance, the nw_src matches with the IP source address.
All the packet fields are well documented in the ovs-fields(7) man-page

Vlodek