Cisco Catalyst 2960 Software Configuration Manual page 402

Configuring VLAN Trunks
Command
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 interface-id_1
Step 3 switchport mode trunk
Step 4
exit
Step 5
Step 6 end
Step 7 show running-config
Step 8 show vlan
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
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
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.
Return to global configuration mode.
Repeat Steps 2 through 4 on a second interface in the Switch A stack.
Return to privileged EXEC mode.
Verify your entries. In the display, make sure that the interfaces are
configured as trunk ports.
When the trunk links come up, Switch A receives the VTP information
from the other switches. Verify that Switch A has learned the VLAN
configuration.
Chapter 13 Configuring VLANs
Figure 13-3:
OL-26520-01