Link Layer Discovery Protocol (LLDP)

Hello Boris

LLDP is a protocol whose purpose is to exchange information between devices at Layer 2. As such, in order for it to function correctly, it must have bidirectional communication between devices. LLDP has no configuration parameters that would enable an interface to accept LLDP frames but not to send them.

However, if you want to, you can use a MAC address access list and block outbound traffic to the 01:80:c2:00:00:0e MAC address which is the multicast destination MAC address used by LLDP.

A similar functionality is available on Cisco small business series switches where, if LLDP is disabled globally on a switch, you can either configure it for LLDP flooding, which floods and forwards all LLDP frames received out of all ports, or LLDP filtering, which blocks all LLDP frames. More info about this can be found here, but I’m not sure that this is really what you were looking for.

If this information doesn’t address your concern, can you tell us a little more about what you actually want to achieve with such a configuration and why? That way we can also discuss alternatives to what you need or want.

I hope this has been helpful!

Laz

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