[lldp-devel] Receiving PDUs from neighbours but not sending any

John Fastabend john.fastabend at gmail.com
Tue Nov 19 08:17:08 UTC 2013

On 11/14/2013 04:23 AM, Owen Dunn wrote:
> I have lldpad 0.9.43, as provided by Scientific Linux 6.3 (RHEL 6.3
> clone).  I want to be able to use lldptool to read information in PDUs
> being sent by the switch the Linux machine is connected to.
> I can see that the switch is sending out PDUs using tcpdump, but if I set
>      lldptool -L -i eth2 adminstatus=rx
> and then:
>      lldptool get-tlv -n -i eth0 -V 1
> ...I get no output.  If I enable transmitting my own PDUs with
>      lldptool -L -i eth2 adminstatus=rxtx
> then I am told the neighbour's chassis ID as expected.
> For various reasons I don't really want to send out my own LLDP PDUs, so
> is it actually possible to configure lldpad only to receive, and not
> transmit anything of its own?
> (S)

This should work, unfortunately it looks like a bug was introduced when
the 'bridge scope' option was added. I'll post a fix here shortly.


John Fastabend         Intel Corporation

More information about the lldp-devel mailing list