Cisco Catalyst 4500 Series Software Configuration Guide

17-20
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 17 Configuring VLANs, VTP, and VMPS
VLAN Membership Policy Server
This example shows how to display information for VTP devices in a domain:
Switch# show vtp devices
Retrieving information from the VTP domain, please wait for 5 seconds.
VTP Feature Conf Revision Primary Server Device ID Device Description
----------- ---- -------- ------------------------------ ------------------
VLAN No 18 0016.9c6d.5300 0012.011a.0d00 R2
VLAN No 18 0016.9c6d.5300 0012.4371.9ec0 R1
MST Yes 4 0012.4371.9ec0=0012.4371.9ec0 R1
Switch#
VLAN Membership Policy Server
This section describes how to configure dynamic port VLAN membership through the VLAN
Membership Policy Server (VMPS), and includes the following subsections:
• About VMPS, page 17-20
• Overview of VMPS Clients, page 17-22
• Dynamic Port VLAN Membership Configuration Example, page 17-28
• VMPS Database Configuration File Example, page 17-31
About VMPS
These subsections describe what a VMPS server does and how it operates:
• Understanding the VMPS Server, page 17-20
• Security Modes for VMPS Server, page 17-21
• Fallback VLAN, page 17-22
• Illegal VMPS Client Requests, page 17-22
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.
VMPS uses a UDP port to listen to VQP requests from clients, so, it is not necessary for VMPS clients
to know if the VMPS resides on a local or remote device on the network. Upon receiving a valid request
from a VMPS client, a VMPS server searches its database for an entry of a MAC-address to VLAN
mapping.
In response to a request, the VMPS takes one of the following actions:
• If the assigned VLAN is restricted to a group of ports, the VMPS verifies the requesting port against
this group and responds as follows:

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E