Cisco WS-C4003 Software Guide - Page 188
Parallel Trunk Configuration Before Configuring VLAN-Traffic Load Sharing
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Example VLAN Trunk Configurations Chapter 11 Configuring VLAN Trunks on Fast Ethernet and Gigabit Ethernet Ports Figure 11-2 Parallel Trunk Configuration Before Configuring VLAN-Traffic Load Sharing Trunk 2 VLANs 10, 20, and 30: port-VLAN priority 32 (blocking) VLANs 40, 50, and 60: port-VLAN priority 1 (forwarding) Catalyst 4000 Switch 1 Catalyst 4000 Switch 2 1/1 1/2 1/1 1/2 43991 Trunk 1 VLANs 10, 20, and 30: port-VLAN priority 1 (forwarding) VLANs 40, 50, and 60: port-VLAN priority 32 (blocking) By default, the port-VLAN priority for both trunks is equal (a value of 32). Therefore, STP blocks port 1/2 (Trunk 2) for each VLAN on Switch 1 to prevent forwarding loops. Trunk 2 is not used to forward traffic unless Trunk 1 fails. This example shows how to configure the switches so that traffic from multiple VLANs is load-balanced over the parallel trunks. Step 1 Step 2 Step 3 Configure a VTP domain on both Switch 1 and Switch 2 by entering the set vtp command so that the VLAN information configured on Switch 1 is learned by Switch 2. Make sure Switch 1 is a VTP server. You can configure Switch 2 as a VTP client or as a VTP server. Switch_1> (enable) set vtp domain BigCorp mode server VTP domain BigCorp modified Switch_1> (enable) Switch_2> (enable) set vtp domain BigCorp mode server VTP domain BigCorp modified Switch_2> (enable) Create the VLANs on Switch 1 by entering the set vlan command. In this example, you see VLANs 10, 20, 30, 40, 50, and 60: Switch_1> (enable) set vlan 10 Vlan 10 configuration successful Switch_1> (enable) set vlan 20 Vlan 20 configuration successful Switch_1> (enable) set vlan 30 Vlan 30 configuration successful Switch_1> (enable) set vlan 40 Vlan 40 configuration successful Switch_1> (enable) set vlan 50 Vlan 50 configuration successful Switch_1> (enable) set vlan 60 Vlan 60 configuration successful Switch_1> (enable) Verify the VTP and VLAN configuration on Switch 1 by entering the show vtp domain and show vlan commands: Switch_1> (enable) show vtp domain Domain Name Domain Index VTP Version Local Mode Password 11-12 Software Configuration Guide-Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4 78-12647-02