Load Sharing Using Stp Path Cost - Cisco IE 3000 Software Configuration Manual
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Configuring VLAN Trunks
Command
Step 16
interface gigabitethernet 0/1
Step 17
spanning-tree vlan 8-10 port-priority 16
Step 18
exit
Step 19
interface gigabitethernet0/2
Step 20
spanning-tree vlan 3-6 port-priority 16
Step 21
end
Step 22
show running-config
Step 23
copy running-config startup-config
Load Sharing Using STP Path Cost
You can configure parallel trunks to share VLAN traffic by setting different path costs on a trunk and
associating the path costs with different sets of VLANs, blocking different ports for different VLANs.
The VLANs keep the traffic separate and maintain redundancy in the event of a lost link.
In
Figure
assigned:
•
•
•
•
Figure 13-3
VLANs 2
VLANs 8
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 mode trunk
Cisco IE 3000 Switch Software Configuration Guide
13-22
13-3, Trunk ports 1 and 2 are configured as 100BASE-T ports. These VLAN path costs are
VLANs 2 through 4 are assigned a path cost of 30 on Trunk port 1.
VLANs 8 through 10 retain the default 100BASE-T path cost on Trunk port 1 of 19.
VLANs 8 through 10 are assigned a path cost of 30 on Trunk port 2.
VLANs 2 through 4 retain the default 100BASE-T path cost on Trunk port 2 of 19.
Load-Sharing Trunks with Traffic Distributed by Path Cost
Trunk port 1
–
4 (path cost 30)
–
10 (path cost 19)
Switch B
Purpose
Define the interface to set the STP port priority, and enter interface
configuration mode.
Assign the port priority of 16 for VLANs 8 through 10.
Return to global configuration mode.
Define the interface to set the STP port priority, and enter interface
configuration mode.
Assign the port priority of 16 for VLANs 3 through 6.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Switch A
Trunk port 2
VLANs 8
–
10 (path cost 30)
VLANs 2
–
4 (path cost 19)
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 as a trunk port.
Chapter 13
Configuring VLANs
Figure
13-3:
OL-13018-01
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