OVS and rstp setup not working


New Member
Aug 3, 2014
Hi everybody,
I try to setup an OVS ring with 3 nodes. This setup requires some kind of stp.
I've created a OVS bridge in the webui and added the option "rstp_enable=true" in the OVS options field.
After a restart I get
Sep 22 12:31:33 nodeA ovs-vsctl[1574]: ovs|00001|vsctl|INFO|Called as ovs-vsctl --timeout=5 -- --may-exist add-br vmbr99 rstp_enable=true --
Sep 22 12:31:33 nodeA ovs-vsctl[1574]: ovs|00002|db_ctl_base|ERR|'add-br' command takes exactly 1 or 3 arguments
Sep 22 12:31:33 nodeA ifup[1491]: ovs-vsctl: 'add-br' command takes exactly 1 or 3 arguments
in the system log.
Manual retry in the CLI gets the same result (of course).
Is this a bug ?
Per the OVS documentation the rstp should be enabled with "ovs-vsctl set Bridge vmbr99 rstp_enable=true"
That works neither :(

Any one ideas?
I can reproduce this. Seems like the set keyword is missing and the options are not in the right order, I'll take a look at it.
As a workaround you can do
ovs-vsctl -- --may-exist add-br vmbr99
ovs-vsctl -- set Bridge vmbr99 rstp_enable=true
or as a single command
ovs-vsctl -- --may-exist add-br vmbr99 -- set Bridge vmbr99 rstp_enable=true
A better workaround is to use the 'ovs_extra' option in your '/etc/network/interfaces/'. Then it should work for 'ifup' and hence at startup.
allow-ovs vmbr2
iface vmbr2 inet static
        netmask  24
        ovs_type OVSBridge
        ovs_extra set Bridge vmbr2 rstp_enable=true
A better workaround is to use the 'ovs_extra' option in your '/etc/network/interfaces/'.

Is this (ovs_extra) sufficient and recommended way of enabling RSTP now?

https://pve.proxmox.com/wiki/Open_vSwitch states that: 'In order to configure a bridge for RSTP support, you must use an "up" script as the "ovs_options" and "ovs_extras" options do not emit the proper commands'
...and also recommends adding a 10 seconds sleep in post-up to allow RSTP to settle.
Definitely nicer if you can do it without pre/post hooks.
Last edited:
it should works with ifupdown2 (apt install ifupdown2)

auto vmbrtest
iface vmbrtest
        ovs_type OVSBridge
        ovs_options rstp_enable=true


info: executing /usr/bin/ovs-vsctl -- --may-exist add-br vmbrtest -- set bridge vmbrtest rstp_enable=true -- --if-exists clear bridge vmbrtest auto_attach controller external-ids fail_mode flood_vlans ipfix mirrors netflow other_config protocols sflow -- --if-exists clear interface vmbrtest mtu_request external-ids other_config options
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