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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 16 Configuring VLANs
Configuring VMPS
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 server for VMPS. 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 number 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.
Default VMPS Client Configuration
Table 16-6 shows the default VMPS and dynamic port configuration on client switches.
VMPS Configuration Guidelines
These guidelines and restrictions apply to dynamic access port VLAN membership:
• You should configure the VMPS before you configure ports as dynamic.
• The communication between a cluster of switches and VMPS is managed by the command switch
and includes port-naming conventions that are different from standard port names. For the
cluster-based port-naming conventions, see the “VMPS Database Configuration File” section on
page 16-26.
• When you configure a port as a dynamic access port, the spanning-tree Port Fast feature is
automatically enabled for that port. The Port Fast mode accelerates the process of bringing the port
into the forwarding state.
• IEEE 802.1X ports cannot be configured as dynamic access ports. If you try to enable IEEE 802.1X
on a dynamic-access (VQP) port, an error message appears, and IEEE 802.1X is not enabled. If you
try to change an IEEE 802.1X-enabled port to dynamic VLAN assignment, an error message
appears, and the VLAN configuration is not changed.
Table 16-6 Default VMPS Client and Dynamic Port Configuration
Feature Default Setting
VMPS domain server None
VMPS reconfirm interval 60 minutes
VMPS server retry count 3
Dynamic ports None configured
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