Configuring Vmps; Understanding Vmps - Cisco Catalyst 3120 Software Manual

Configuring VMPS

Command
Step 11 interface gigabitethernet1/0/1
Step 12
spanning-tree vlan 2-4 cost 30
Step 13
end
Step 14
Step 15 exit
Step 16
show running-config
Step 17
copy running-config startup-config
Configuring VMPS
The VLAN Query Protocol (VQP) is used to support dynamic-access ports, which are not permanently
assigned to a VLAN, but give VLAN assignments based on the MAC source addresses seen on the port.
Each time an unknown MAC address is seen, the switch sends a VQP query to a remote VMPS; the query
includes the newly seen MAC address and the port on which it was seen. The VMPS responds with a
VLAN assignment for the port. The switch cannot be a VMPS server but can act as a client to the VMPS
and communicate with it through VQP.
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Understanding VMPS

Each time the client switch receives the MAC address of a new host, it sends a VQP query to the VMPS.
When the VMPS receives this query, it searches its database for a MAC-address-to-VLAN mapping. The
server response is based on this mapping and whether or not the server is in open or secure mode. In
secure mode, the server shuts down the port when an illegal host is detected. In open mode, the server
simply denies the host access to the port.
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
12-28
"Understanding VMPS" section on page 12-28
"Default VMPS Client Configuration" section on page 12-30
"VMPS Configuration Guidelines" section on page 12-30
"Configuring the VMPS Client" section on page 12-30
"Monitoring the VMPS" section on page 12-33
"Troubleshooting Dynamic-Access Port VLAN Membership" section on page 12-34
"VMPS Configuration Example" section on page 12-34
Purpose
Define the interface on which to set the STP cost, and enter interface
configuration mode.
Set the spanning-tree path cost to 30 for VLANs 2 through 4.
Return to global configuration mode.
Repeat Steps 9 through 13 on the other configured trunk interface on
Switch A, and set the spanning-tree path cost to 30 for VLANs 8, 9, and
10.
Return to privileged EXEC mode.
Verify your entries. In the display, verify that the path costs are set
correctly for both trunk interfaces.
(Optional) Save your entries in the configuration file.
Chapter 12 Configuring VLANs
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