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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 14 Configuring VLANs
Configuring VMPS
If the link goes down on a dynamic port, the port returns to an isolated state and does not belong to a
VLAN. Any hosts that come online through the port are checked again through the VQP with the VMPS
before the port is assigned to a VLAN.
VMPS Database Configuration File
The VMPS contains a database configuration file that you create. This ASCII text file is stored on a
switch-accessible TFTP server that functions as a VMPS server. The file contains VMPS information,
such as the domain name, the fallback VLAN name, and the MAC-address-to-VLAN mapping. The
switch cannot act as the VMPS, but you can use a Catalyst 5000 or Catalyst 6000 series switch as the
VMPS.
You can configure a fallback VLAN name. If you connect a device with a MAC address that is not in the
database, the VMPS sends the fallback VLAN name to the client. If you do not configure a fallback
VLAN and the MAC address does not exist in the database, the VMPS sends an access-denied response.
If the VMPS is in secure mode, it sends a port-shutdown response.
Whenever port names are used in the VMPS database configuration file, the server must use the switch
convention for naming ports. For example, Fa0/4 is fixed Fast Ethernet port number 4. If the switch is a
cluster member, the command switch adds the name of the switch before the type. For example,
es3%Fa0/4 refers to fixed Fast Ethernet port 4 on member switch 3. When port names are required, these
naming conventions must be followed in the VMPS database configuration file when it is configured to
support a cluster.
This example shows a example of a VMPS database configuration file as it appears on a Catalyst 6000
series switch. The file has these characteristics:
• The security mode is open.
• The default is used for the fallback VLAN.
• MAC address-to-VLAN name mappings—The MAC address of each host and the VLAN to which
each host belongs is defined.
• Port groups are defined.
• VLAN groups are defined.
• VLAN port policies are defined for the ports associated with restricted VLANs.
!VMPS File Format, version 1.1
! Always begin the configuration file with
! the word “VMPS”
!
!vmps domain <domain-name>
! The VMPS domain must be defined.
!vmps mode {open | secure}
! The default mode is open.
!vmps fallback <vlan-name>
!vmps no-domain-req { allow | deny }
!
! The default value is allow.
vmps domain DSBU
vmps mode open
vmps fallback default
vmps no-domain-req deny
!
!
!MAC Addresses
!
vmps-mac-addrs
!
