Load Sharing Using Stp Path Cost - Cisco Catalyst 2360 Software Configuration Manual

Configuring VLAN Trunks
Command
Step 6
show vlan
Step 7 configure terminal
Step 8 interface gigabitethernet 0/1
Step 9 switchport mode trunk
Step 10 end
Step 11
show interfaces gigabitethernet 0/1
switchport
Step 12
Step 13
Step 14 show vlan
Step 15 configure terminal
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:
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Catalyst 2360 Switch Software Configuration Guide
9-22
9-3, 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.
Purpose
Verify that the VLANs exist in the database on Switch A.
Enter global configuration mode.
Define the interface to be configured as a trunk, and enter interface
configuration mode.
Configure the port as a trunk port.
The Catalyst 2360 switch supports only IEEE 802.1q
Note
trunking.
Return to privileged EXEC mode.
Verify the VLAN configuration.
Repeat Steps 7 through 11on Switch A for a second port in the switch.
Repeat Steps 7 through 11on 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.
Chapter 9 Configuring VLANs
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