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Configuring VLAN Trunks
Command
Step 13
Step 14
Step 15
show vlan
Step 16
configure terminal
Step 17
interface gigabitethernet 0/1
Step 18
spanning-tree vlan 8-10 port-priority 16
Step 19
exit
Step 20
interface gigabitethernet0/2
Step 21
spanning-tree vlan 3-6 port-priority 16
Step 22
end
Step 23
show running-config
Step 24
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 11-4
VLANs 2
VLANs 8
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
11-26
11-4, 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
Repeat Steps 7 through 11 on Switch A for a second port in the switch.
Repeat Steps 7 through 11 on Switch B to configure the trunk ports
that connect to the trunk ports configured on Switch A.
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.
Enter global configuration mode on Switch A.
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)
Chapter 11
Configuring VLANs
OL-8915-03
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Troubleshooting
