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10-17
Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter 10 Understanding and Configuring VLANs, VTP, and VMPS
VLAN Membership Policy Server
This example shows how to display VTP statistics:
Switch# show vtp counters
VTP statistics:
Summary advertisements received : 7
Subset advertisements received : 5
Request advertisements received : 0
Summary advertisements transmitted : 997
Subset advertisements transmitted : 13
Request advertisements transmitted : 3
Number of config revision errors : 0
Number of config digest errors : 0
Number of V1 summary errors : 0
VTP pruning statistics:
Trunk Join Transmitted Join Received Summary advts received from
non-pruning-capable device
---------------- ---------------- ---------------- ---------------------------
Fa5/8 43071 42766 5
VLAN Membership Policy Server
This section describes how to configure dynamic port VLAN membership through the VLAN
Membership Policy Server (VMPS).
This section includes the following subsections:
• Overview of VMPS, page 10-17
• Overview of VMPS Clients, page 10-20
• Dynamic Port VLAN Membership Configuration Example, page 10-26
• VMPS Database Configuration File Example, page 10-29
Overview of VMPS
These subsections describe what a VMPS server does and how it operates:
• Understanding the VMPS Server, page 10-17
• Security Modes for VMPS Server, page 10-18
• Fallback VLAN, page 10-19
• Illegal VMPS Client Requests, page 10-20
Understanding the VMPS Server
A VLAN Membership Policy Server (VMPS) provides a centralized server for selecting the VLAN for
a port dynamically based on the MAC address of the device connected to the port. When the host moves
from a port on one switch in the network to a port on another switch in the network, that switch
dynamically assigns the new port to the proper VLAN for that host.
A Catalyst 4500 series switch running Cisco IOS software does not support the functionality of a VMPS.
It can only function as a VLAN Query Protocol (VQP) client, which communicates with a VMPS
through the VQP. For VMPS functionality, you need to use a Catalyst 4500 series switch (or Catalyst
6500 series switch) running Catalyst operating system (OS) software.