Configuring Vmps; Understanding Vmps - Cisco Catalyst 2960 Software Configuration Manual

Chapter 13 Configuring VLANs
Command
Step 9
configure terminal
Step 10
interface interface-id_1
Step 11 spanning-tree vlan 2-4 cost 30
Step 12 end
Step 13
Step 14 exit
Step 15
show running-config
Step 16
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.
These sections contain this information:
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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.
If the port is currently unassigned (that is, it does not yet have a VLAN assignment), the VMPS provides
one of these responses:
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OL-26520-01
"Understanding VMPS" section on page 13-23
"Default VMPS Client Configuration" section on page 13-25
"VMPS Configuration Guidelines" section on page 13-25
"Configuring the VMPS Client" section on page 13-25
"Monitoring the VMPS" section on page 13-28
"Troubleshooting Dynamic-Access Port VLAN Membership" section on page 13-29
"VMPS Configuration Example" section on page 13-29
If the host is allowed on the port, the VMPS sends the client a vlan-assignment response containing
the assigned VLAN name and allowing access to the host.
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
Purpose
Enter global configuration mode.
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 12 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.
Configuring VMPS
13-23