Cisco WS-C3750-48PS-S Software Configuration Manual page 309

Chapter 13 Configuring VLANs
Figure 13-3 Load Sharing by Using STP Port Priorities
VLANs 8 – 10 (priority 16)
VLANs 3 – 6 (priority 128)
If your switch is a member of a switch stack, you must use the spanning-tree [vlan vlan-id] cost cost
Note
interface configuration command instead of the spanning-tree [vlan vlan-id] port-priority priority
interface configuration command to select an interface to put in the forwarding state. Assign lower cost
values to interfaces that you want selected first and higher cost values that you want selected last. For
more information, see the
Beginning in privileged EXEC mode, follow these steps to configure the network shown in
Command
Step 1 configure terminal
Step 2
vtp domain domain-name
Step 3
vtp mode server
Step 4 end
Step 5 show vtp status
Step 6
show vlan
Step 7 configure terminal
Step 8 interface gigabitethernet1/ 0/1
Step 9 switchport trunk encapsulation {isl |
dot1q | negotiate}
Step 10 switchport mode trunk
Step 11
end
Step 12 show interfaces gigabitethernet1/ 0/1
switchport
Step 13
Step 14
78-16180-02
Switch A
Trunk 1
Switch B
"Load Sharing Using STP Path Cost" section on page
Purpose
Enter global configuration mode on Switch A.
Configure a VTP administrative domain.
The domain name can be from 1 to 32 characters.
Configure Switch A as the VTP server.
Return to privileged EXEC mode.
Verify the VTP configuration on both Switch A and Switch B.
In the display, check the VTP Operating Mode and the VTP Domain
Name fields.
Verify that the VLANs exist in the database on Switch A.
Enter global configuration mode.
Enter interface configuration mode, and define the interface to be
configured as a trunk.
Configure the port to support ISL or 802.1Q encapsulation or to
negotiate with the neighboring interface. You must configure each
end of the link with the same encapsulation type.
Configure the port as a trunk port.
Return to privileged EXEC mode.
Verify the VLAN configuration.
Repeat Steps 7 through 11 on Switch A for a second interface in the
switch stack.
Repeat Steps 7 through 11 on Switch B to configure the trunk ports
that connect to the trunk ports configured on Switch A.
Trunk 2
VLANs 3 – 6 (priority 16)
VLANs 8 – 10 (priority 128)
Catalyst 3750 Switch Software Configuration Guide
Configuring VLAN Trunks
13-26.
Figure 13-3.
13-25