Cisco WS-C2960S-24PD-L Software Guide - Page 255
Configuring STP Port Priorities and Load Sharing,
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Chapter 8 Configuring VLANs Load Sharing Using STP In this way, trunk 1 carries traffic for VLANs 8 through 10, and trunk 2 carries traffic for VLANs 3 through 6. If the active trunk fails, the trunk with the lower priority takes over and carries the traffic for all of the VLANs. No duplication of traffic occurs over any trunk port. Figure 8-5 Load Sharing by Using STP Port Priorities Switch 1 Trunk 1 VLANs 8 - 10 (priority 10) VLANs 3 - 6 (priority 128) Switch 2 Trunk 2 VLANs 3 - 6 (priority 10) VLANs 8 - 10 (priority 128) 15932 Configuring STP Port Priorities and Load Sharing Beginning in privileged EXEC mode, follow these steps to configure the network shown in Figure 8-5: Step 1 Step 2 Command vlan database vtp domain domain-name Step 3 Step 4 Step 5 vtp server exit show vtp status Step 6 Step 7 Step 8 show vlan configure terminal interface fa0/1 Step 9 switchport mode trunk Step 10 end Step 11 show interface fa0/1 switchport Step 12 Step 13 Step 14 show vlan Step 15 configure terminal Purpose On Switch 1, enter VLAN configuration mode. Configure a VTP administrative domain. The domain name can be from 1 to 32 characters. Configure Switch 1 as the VTP server. Return to privileged EXEC mode. Verify the VTP configuration on both Switch 1 and Switch 2. In the display, check the VTP Operating Mode and the VTP Domain Name fields. Verify that the VLANs exist in the database on Switch 1. Enter global configuration mode. Enter interface configuration mode, and define Fa0/1 as the interface to be configured as a trunk. Configure the port as a trunk port. The trunk defaults to ISL trunking. Return to privileged EXEC mode. Verify the VLAN configuration. Repeat Steps 7 through 11 on Switch 1 for interface Fa0/2. Repeat Steps 7 through 11 on Switch 2 to configure the trunk ports on interface Fa0/1 and Fa0/2. When the trunk links come up, VTP passes the VTP and VLAN information to Switch 2. Verify the Switch 2 has learned the VLAN configuration. Enter global configuration mode on Switch 1. 78-6511-08 Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide 8-33