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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
78-11380-10
Chapter 17 Configuring VLANs
Configuring VLAN Trunks
Beginning in privileged EXEC mode, follow these steps to configure the network shown in Figure 17-3.
Command Purpose
Step 1
configure terminal Enter global configuration mode on Switch 1.
Step 2
vtp domain domain-name Configure a VTP administrative domain.
The domain name can be from 1 to 32 characters.
Step 3
vtp mode server Configure Switch 1 as the VTP server.
Step 4
end Return to privileged EXEC mode.
Step 5
show vtp status 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.
Step 6
show vlan Verify that the VLANs exist in the database on Switch A.
Step 7
configure terminal Enter global configuration mode.
Step 8
interface fastethernet 0/1 Enter interface configuration mode, and define Fast Ethernet port 0/1
as the interface to be configured as a trunk.
Step 9
switchport mode trunk Configure the port as a trunk port.
Step 10
end Return to privilege EXEC mode.
Step 11
show interfaces fastethernet0/1
switchport
Verify the VLAN configuration.
Step 12
Repeat Steps 7 through 11 on Switch A for Fast Ethernet port 0/2.
Step 13
Repeat Steps 7 through 11 on Switch B to configure the trunk ports on
Fast Ethernet ports 0/1 and 0/2.
Step 14
show vlan When the trunk links come up, VTP passes the VTP and VLAN
information to Switch B. Verify that Switch B has learned the VLAN
configuration.
Step 15
configure terminal Enter global configuration mode on Switch A.
Step 16
interface fastethernet0/1 Enter interface configuration mode, and define the interface to set the
STP port priority.
Step 17
spanning-tree vlan 8-10 port-priority 16 Assign the port priority of 16 for VLANs 8 through 10.
Step 18
spanning-tree vlan 10 port-priority 16 Assign the port priority of 16 for VLAN 10.
Step 19
exit Return to global configuration mode.
Step 20
interface fastethernet0/2 Enter interface configuration mode, and define the interface to set the
STP port priority.
Step 21
spanning-tree vlan 3-6 port-priority 16 Assign the port priority of 16 for VLANs 3 through 6.
Step 22
end Return to privileged EXEC mode.
Step 23
show running-config Verify your entries.
Step 24
copy running-config startup-config (Optional) Save your entries in the configuration file.