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vdp - Show / manipulate VDP TLV configuration


lldptool -t -i ethx -V vdp -c enableTx

lldptool -T -i ethx -V vdp -c enableTx=[yes|no]

lldptool -t -i ethx -V vdp -c mode

lldptool -T -i ethx -V vdp -c mode=<mode>,<mgrid>,<typeid>,<typeidversion>,<instanceid>,<mac>,<vlan>

lldptool -t -i ethx -V vdp -c role

lldptool -T -i ethx -V vdp -c role=[station|bridge]


The VSI discovery protocol (VDP) is NOT a TLV in the LLDP sense but rather a protocol to manage the association and deassociation of virtual station interfaces (VSIs) between the station and an adjacent switch. VDP uses ECP as transport for VDP TLVs. An ECP frame may contain multiple VDP TLVs. Each VDP TLVs contains a mode, typeid, version, instanceid, mac and vlan for a VSI.


enableTx Enables or disables VDP

mode shows or sets modes for VSIs with the following parameters:


mode (0=preassociate, 1=preassociate with RR, 2=associate, 3=deassociate)


manager (database) id


VSI type id


VSI type id version


VSI instance id


VDP filter info format


VSI mac address


VSI vlan id

role shows or sets the role of the local machine to act as either station (default) or bridge.

Theory of Operation

The VDP protocol is used to pre-associate, associate or deassociate VSIs to and adjacent switch. Information about the VSIs is formatted into VDP TLVs which are then handed to ECP for lower-level transport. Each ECP frame may contain multiple VDP TLVs.

Two ways to receive VSI information exist in llpdad: via netlink or with lldptool. netlink is used by libvirt to communicate VSIs to lldpad. lldptool can be used to associate/deassociate VSIs from the command line. This is especially helpful for testing purposes.


Display if vdp is enabled on eth8

lldptool -t -i eth8 -V vdp -c enableTx

Enable vdp on eth8

lldptool -T -i eth8 -V vdp -c enableTx=yes

Display the currently configured VSIs for eth8

lldptool -t -i eth8 -V vdp -c mode

Associate a VSI on eth8

lldptool -T -i eth8 -V vdp -c mode=2,12,1193046,1,fa9b7fff-b0a0-4893-8e0e-beef4ff18f8f,2,52:54:00:C7:3E:CE,3

Display the locally configured role for VDP on eth8

lldptool -t -i eth8 -V vdp -c role

Set the local role for VDP on eth8

lldptool -T -i eth8 -V vdp -c role=bridge



Currently the code in lldpad reflects draft 0 of the upcoming standard. ECP/VDP TLVs on the wire can be decoded with wireshark > v1.8.



Jens Osterkamp

This document was created by man2html, using the manual pages.

Time: 20:18:51 GMT, January 24, 2013

lldptool-vdp.txt · Last modified: 2013/01/24 12:23 by rbbratta