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Catalyst 3560 Switch Software Configuration Guide
OL-8553-06
Chapter 13 Configuring VLANs
Configuring VMPS
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:
• “Understanding VMPS” section on page 13-28
• “Default VMPS Client Configuration” section on page 13-29
• “VMPS Configuration Guidelines” section on page 13-29
• “Configuring the VMPS Client” section on page 13-30
• “Monitoring the VMPS” section on page 13-32
• “Troubleshooting Dynamic-Access Port VLAN Membership” section on page 13-33
• “VMPS Configuration Example” section on page 13-33
Step 3
switchport trunk encapsulation
{isl | dot1q | negotiate}
Configure the port to support ISL or IEEE 802.1Q encapsulation. You
must configure each end of the link with the same encapsulation type.
Step 4
switchport mode trunk Configure the port as a trunk port. The trunk defaults to ISL trunking.
Step 5
exit Return to global configuration mode.
Step 6
Repeat Steps 2 through 5 on a second interface in Switch A.
Step 7
end Return to privileged EXEC mode.
Step 8
show running-config Verify your entries. In the display, make sure that the interfaces are
configured as trunk ports.
Step 9
show vlan When the trunk links come up, Switch A receives the VTP information
from the other switches. Verify that Switch A has learned the VLAN
configuration.
Step 10
configure terminal Enter global configuration mode.
Step 11
interface gigabitethernet0/1 Define the interface on which to set the STP cost, and enter interface
configuration mode.
Step 12
spanning-tree vlan 2-4 cost 30 Set the spanning-tree path cost to 30 for VLANs 2 through 4.
Step 13
end Return to global configuration mode.
Step 14
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.
Step 15
exit Return to privileged EXEC mode.
Step 16
show running-config Verify your entries. In the display, verify that the path costs are set
correctly for both trunk interfaces.
Step 17
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose