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Chapter 11
Configuring VLANs
Beginning in privileged EXEC mode, follow these steps to configure the network shown in
Command
Step 1
configure terminal
Step 2
interface gigabitethernet0/1
Step 3
switchport trunk encapsulation
{isl | dot1q | negotiate}
Step 4
switchport mode trunk
Step 5
exit
Step 6
Step 7
end
Step 8
show running-config
Step 9
show vlan
Step 10
configure terminal
Step 11
interface gigabitethernet0/1
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.
These sections contain this information:
•
•
•
OL-8915-03
"Understanding VMPS" section on page 11-28
"Default VMPS Client Configuration" section on page 11-29
"VMPS Configuration Guidelines" section on page 11-29
Purpose
Enter global configuration mode on Switch A.
Define the interface to be configured as a trunk, and enter interface
configuration mode.
Configure the port to support ISL or IEEE 802.1Q encapsulation. You
must configure each end of the link with the same encapsulation type.
Configure the port as a trunk port. The trunk defaults to ISL trunking.
Return to global configuration mode.
Repeat Steps 2 through 5 on a second interface in Switch A.
Return to privileged EXEC mode.
Verify your entries. In the display, make sure that the interfaces are
configured as trunk ports.
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.
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 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.
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
Configuring VMPS
Figure
11-4:
11-27
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Troubleshooting
