Dell POWEREDGE M1000E - Manual (Page 393)

13-27
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
OL-13270-03
Chapter 13 Configuring VLANs
Configuring VLAN Trunks
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 13-5 , Trunk ports 1 and 2 are configured as 100BASE-T ports. These VLAN path costs are
assigned:
• 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.
Figure 13-5 Load-Sharing Trunks with Traffic Distributed by Path Cost
Beginning in privileged EXEC mode, follow these steps to configure the network shown in Figure 13-5 :
90573
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 gigabitethernet1/0/1 Define the interface to be configured as a trunk, and enter interface
configuration mode.
Step 3 switchport trunk encapsulation
{isl | dot1q | negotiate}
Configure the port to support ISL or IEEE 802.1Q encapsulation. You
must configure each end of the link with the same encapsulation type.
Step 4 switchport mode trunk Configure the port as a trunk port. The trunk defaults to ISL trunking.
Step 5 exit Return to global configuration mode.
Step 6 Repeat Steps 2 through 5 on a second interface in Switch A.
Step 7 end Return to privileged EXEC mode.
Step 8 show running-config Verify your entries. In the display, make sure that the interfaces are
configured as trunk ports.
Step 9 show vlan 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.
Step 10 configure terminal Enter global configuration mode.
Step 11 interface gigabitethernet1/0/1 Define the interface on which to set the STP cost, and enter interface
configuration mode.