Cisco WS-C4003 Software Guide - Page 193
Parallel Trunk Configuration After Configuring VLAN Traffic Load-Sharing
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Chapter 11 Configuring VLAN Trunks on Fast Ethernet and Gigabit Ethernet Ports Example VLAN Trunk Configurations Figure 11-3 Parallel Trunk Configuration After Configuring VLAN Traffic Load-Sharing Trunk 2 VLANs 10, 20, 30, 40, 50, and 60: port-VLAN priority 32 (blocking) Catalyst 4000 Switch 1 Catalyst 4000 Switch 2 1/1 1/2 1/1 1/2 43992 Trunk 1 VLANs 10, 20, 30, 40, 50, and 60: port-VLAN priority 32 (forwarding) Figure 11-3 shows that both trunks are utilized when the network is operating normally and, if one trunk link fails, the other trunk link acts as an alternate forwarding path for the traffic previously traveling over the failed link. If Trunk 1 fails in the network shown in Figure 11-3, STP reconverges to use Trunk 2 to forward traffic from all the VLANs, as shown in the following example: Switch_1> (enable) 04/21/1998,03:15:40:DISL-5:Port 1/1 has become non-trunk Switch_1> (enable) show spantree 1/1 Port Vlan Port-State Cost 1/1 1 not-connected 19 Switch_1> (enable) show spantree 1/2 Port Vlan Port-State Cost 1/2 1 learning 19 1/2 10 learning 19 1/2 20 learning 19 1/2 30 learning 19 1/2 40 forwarding 19 1/2 50 forwarding 19 1/2 60 forwarding 19 1/2 1003 not-connected 19 1/2 1005 not-connected 19 Switch_1> (enable) show spantree 1/2 Port Vlan Port-State Cost 1/2 1 forwarding 19 1/2 10 forwarding 19 1/2 20 forwarding 19 1/2 30 forwarding 19 1/2 40 forwarding 19 1/2 50 forwarding 19 1/2 60 forwarding 19 1/2 1003 not-connected 19 1/2 1005 not-connected 19 Switch_1> (enable) Priority -------- 32 Priority -------- 32 32 32 32 1 1 1 32 4 Priority -------- 32 32 32 32 1 1 1 32 4 Fast-Start ---------- disabled Fast-Start ---------- disabled disabled disabled disabled disabled disabled disabled disabled disabled Fast-Start ---------- disabled disabled disabled disabled disabled disabled disabled disabled disabled Group-method -----------Group-method Group-method 78-12647-02 Software Configuration Guide-Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4 11-17