Cisco 2950G 24 Software Configuration Guide - Page 359
Load Sharing Using STP Path Cost, Step 17
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Chapter 14 Configuring VLANs Configuring VLAN Trunks Step 17 Step 18 Step 19 Step 20 Step 21 Command spanning-tree vlan 8 port-priority 10 spanning-tree vlan 9 port-priority 10 spanning-tree vlan 10 port-priority 10 exit interface fastethernet0/2 Step 22 Step 23 Step 24 Step 25 Step 26 Step 27 Step 28 spanning-tree vlan 3 port-priority 10 spanning-tree vlan 4 port-priority 10 spanning-tree vlan 5 port-priority 10 spanning-tree vlan 6 port-priority 10 end show running-config copy running-config startup-config Purpose Assign the port priority of 10 for VLAN 8. Assign the port priority of 10 for VLAN 9. Assign the port priority of 10 for VLAN 10. Return to global configuration mode. Enter interface configuration mode, and define the interface to set the STP port priority. Assign the port priority of 10 for VLAN 3. Assign the port priority of 10 for VLAN 4. Assign the port priority of 10 for VLAN 5. Assign the port priority of 10 for VLAN 6. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. 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 14-4, 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 14-4 Load-Sharing Trunks with Traffic Distributed by Path Cost Switch 1 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) 16591 Switch 2 78-14982-01 Catalyst 2950 Desktop Switch Software Configuration Guide 14-23
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