On Fri, May 13, 2016 at 02:34:34PM +0200, Alessio Giorgetti wrote:
> I'm trying to use the Ryu controller on a very simple network composed of
> five Open vSwitch 2.4 (no loop is present currently in the topology).
>
> I would enable STP at the controller, so followed the indications found on
> the ryubook and changed the BPDU dest address to 01:80:c2:00:00:0e, as
> illustrated in simple_switch_stp_13. This is because otherwise Open
> vSwitches with not enabled STP discards frames addressed to
> 01:80:c2:00:00:00.
>
> However, the system is not working, from the ryu output it seems that STP is
> not converging and several LinkUp/LinkDown events are detected.
>
> I simplified the network topology keeping only 2 switches, connected by a
> single link but the problem persists.
>
> I guess it is a configuration problem of the switches, it seems that also
> frames addressed to 01:80:c2:00:00:0e are discarded.
Of course they are, it's required by the IEEE specification for
switches, see the documentation:
other_config : forward-bpdu: optional string, either true or false
Controls forwarding of BPDUs and other network control frames
when NORMAL action is invoked. When this option is false or
unset, frames with reserved Ethernet addresses (see table below)
will not be forwarded. When this option is true, such frames
will not be treated specially.
The above general rule has the following exceptions:
· If STP is enabled on the bridge (see the stp_enable col‐
umn in the Bridge table), the bridge processes all
received STP packets and never passes them to OpenFlow or
forwards them. This is true even if STP is disabled on
an individual port.
· If LLDP is enabled on an interface (see the lldp column
in the Interface table), the interface processes received
LLDP packets and never passes them to OpenFlow or for‐
wards them.
Set this option to true if the Open vSwitch bridge connects dif‐
ferent Ethernet networks and is not configured to participate in
STP.
This option affects packets with the following destination MAC
addresses:
01:80:c2:00:00:00
IEEE 802.1D Spanning Tree Protocol (STP).
01:80:c2:00:00:01
IEEE Pause frame.
01:80:c2:00:00:0x
Other reserved protocols.
00:e0:2b:00:00:00
Extreme Discovery Protocol (EDP).
00:e0:2b:00:00:04 and 00:e0:2b:00:00:06
Ethernet Automatic Protection Switching (EAPS).
01:00:0c:cc:cc:cc
Cisco Discovery Protocol (CDP), VLAN Trunking Protocol
(VTP), Dynamic Trunking Protocol (DTP), Port Aggregation
Protocol (PAgP), and others.
01:00:0c:cc:cc:cd
Cisco Shared Spanning Tree Protocol PVSTP+.
01:00:0c:cd:cd:cd
Cisco STP Uplink Fast.
01:00:0c:00:00:00
Cisco Inter Switch Link.
01:00:0c:cc:cc:cx
Cisco CFM.
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