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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 8 Configuring VLANs
How the VMPS Works
VMPS Configuration Guidelines
These guidelines and restrictions apply to dynamic port VLAN membership:
• You must 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 8-29.
• When the port is configured as dynamic access port, it changes to an unassigned VLAN state until
it is assigned a valid VLAN by VMPS. The Port Fast feature is also automatically enabled when the
port is assigned with a valid VLAN by VMPS
.
• Secure ports cannot be dynamic ports. You must disable port security on the port before it becomes
dynamic.
• Trunk ports cannot be dynamic ports, but it is possible to enter the switchport access vlan dynamic
interface configuration command for a trunk port. In this case, the switch retains the setting and
applies it if the port is later configured as an access port.
You must turn off trunking on the port before the dynamic access setting takes effect.
• Dynamic ports cannot be network ports or monitor ports.
• The VTP management domain of the VMPS client and the VMPS server must be the same.
• Physical ports in a port channel cannot be configured as dynamic ports.
• Port channels cannot be configured as dynamic ports.
• 802.1X ports cannot be configured as dynamic ports.
Default VMPS Configuration
Table 8-9 shows the default VMPS and dynamic port configuration on client switches.
Configuring Dynamic VLAN Membership
You must enter the IP address of the Catalyst 5000 switch or the other device acting as the VMPS to
configure the Catalyst 2950 switch as a client. If the VMPS is being defined for a cluster of switches,
enter the address on the command switch.
Table 8-9 Default VMPS Client and Dynamic Port Configuration
Feature Default Configuration
VMPS domain server None
VMPS reconfirm interval 60 minutes
VMPS server retry count 3
Dynamic ports None configured
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