Cisco Catalyst 2900 Series XL Especificaciones descargar pdf (Pagina 225)

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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide

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Chapter 8 Configuring VLANs

Load Sharing Using STP

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. The VLANs keep the traffic separate; because

no loops exist, STP does not disable the ports; and redundancy is maintained in the event of a lost link.

In Figure 8-6, trunk ports 1 and 2 are 100BASE-T ports. The path costs for the VLANs are assigned as

follows:

• 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 8-6 Load-Sharing Trunks with Traffic Distributed by Path Cost

Step 16

interface fa0/1 Enter interface configuration mode, and define the interface to set the STP

port priority.

Step 17

spanning-tree vlan 8 9 10

port-priority 10

Assign the port priority of 10 for VLANs 8, 9, and 10.

Step 18

end Return to global configuration mode.

Step 19

interface fa0/2 Enter interface configuration mode, and define the interface to set the STP

port priority.

Step 20

spanning-tree vlan 3 4 5 6 port

priority 10

Assign the port priority of 10 for VLANs 3, 4, 5, and 6.

Step 21

exit Return to privileged EXEC mode.

Step 22

show running-config Verify your entries.

Command Purpose

16591

Switch 1

Switch 2

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)

1 2 ... 220 221 222 223 224 225 226 227 228 229 230 ... 321 322

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