[ovs-discuss] LLDP messages

Glauco Gonçalves glaestgon at gmail.com
Mon Oct 10 20:35:33 UTC 2011

Hi all,

I have a simple setup with a NOX controller in one PC and other two PCs with
OVS. The OVS boxes are linked directly to the NOX box and have a link
between them also. I'm trying to use the NOX topology
discovery module, which uses LLDP packets.

My problem is that the OVS boxes do not forward the LLDP packets generated
by NOX. When I check the logs generated by ovs-vswitchd I got several
messages like those:

Oct 10 17:14:38|27968|vconn|DBG|tcp: received:
OFPT_PACKET_OUT (xid=0x0): in_port=CONTROLLER actions_len=8 actions=output:1
00:02:44:2e:71:b9 > 01:23:20:00:00:01, ethertype LLDP (0x88cc), length 34:
Oct 10 17:14:38|27972|dpif|WARN|system at br0: execute 1 failed (Invalid
argument) on packet 00:02:44:2e:71:b9 > 01:23:20:00:00:01, ethertype LLDP
(0x88cc), length 34:

The first message shows the LLDP packet sent by NOX in the OFPT_PACKET_OUT
openflow message and the second is a strange warning. Which is the "Invalid
argument" in the second message? Also, why the LLDP messages are discarded
by OVS?

Best regards,
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