A VLAN Management Policy Server or "VMPS" is a network switch that contains a mapping of device information to VLAN.
The primary goal of VMPS is VLAN assignment for general network management purposes, but can also be used for providing security through segregating clients with an unknown MAC address, or through further extension of the protocol to provide login for Cisco AClS. This last functionality is now deprecated by Cisco, in favour of 802.1x, and as the VMPS technology is Cisco only, the VLAN assignment can now be carried out in the 802.1x framework.
Client switches query the VMPS server using the VLAN Query Protocol, or VQP. Only Cisco produces hardware with VMPS client functionality, and is currently fully supported across their IOS switching lines. Cisco officially only supports the use of Catalyst 4000, 5000 and 6500 switch platforms (with appropriate firmware) as VMPS servers, but these have limited functionality, and only support a static text file transferred into them with tftp.
Read more about VLAN Management Policy Server: Third Party Servers
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