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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
Chapter 11 Configuring VLANs
Configuring VLAN Trunks
Figure 11-4 Load-Sharing Trunks with Traffic Distributed by Path Cost
Beginning in privileged EXEC mode, follow these steps to configure the network shown in Figure 11-4:
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Switch A
Switch B
Trunk port 1
VLANs 2 – 4 (path cost 30)
VLANs 8 – 10 (path cost 19)
Trunk port 2
VLANs 8 – 10 (path cost 30)
VLANs 2 – 4 (path cost 19)
Command Purpose
Step 1
configure terminal Enter global configuration mode on Switch A.
Step 2
interface fastethernet0/1 Define the interface to be configured as Trunk port 1, and enter interface
configuration mode.
Step 3
port-type {nni | eni} Configure the interface as an NNI or ENI. UNIs do not support STP. If
you configure the port as an ENI, you must also enable STP on the port
by entering the spanning-tree interface configuration command.
Step 4
switchport mode trunk Configure the port as a trunk port.
Step 5
exit Return to global configuration mode.
Step 6
interface fastethernet0/2 Define the interface to be configured as Trunk port 2, and enter interface
configuration mode.
Step 7
port-type {nni | eni} Configure the interface as an NNI or ENI. UNIs do not support STP. If
you configure the port as an ENI, you must also enable STP on the port
by entering the spanning-tree interface configuration command.
Step 8
switchport mode trunk Configure the port as a trunk port.
Step 9
end Return to privileged EXEC mode.
Step 10
show running-config Verify your entries. In the display, make sure that the interfaces
configured in Steps 2 and 7 are configured as trunk ports.
Step 11
show vlan Verify that VLANs 2 through 4 and 8 through 10 are configured on
Switch A. If not, create these VLANs.
Step 12
configure terminal Enter global configuration mode.
Step 13
interface fastethernet0/1 Enter interface configuration mode for Trunk port 2.
Step 14
spanning-tree vlan 2-4 cost 30 Set the spanning-tree path cost to 30 for VLANs 2 through 4.
Step 15
exit Return to global configuration mode.
Step 16
interface fastethernet0/2 Enter interface configuration mode for Trunk port 2.
Step 17
spanning-tree vlan 8-10 cost 30 Set the spanning-tree path cost to 30 for VLANs 2 through 4.
Step 18
exit Return to global configuration mode.
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