Cisco WS-C4003 Software Guide - Page 186
Step 5, trunk mode. The system logging
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Example VLAN Trunk Configurations Chapter 11 Configuring VLAN Trunks on Fast Ethernet and Gigabit Ethernet Ports Step 5 Step 6 3/5 connected auto channel WS-C4003 JAB023806(Sw 2/5 3/6 connected auto channel WS-C4003 JAB023806(Sw 2/6 Switch_B> (enable) Configure one of the ports in the EtherChannel bundle to negotiate an 802.1Q trunk. The configuration is applied to all of the ports in the bundle. This example assumes that the neighboring ports on Switch B are configured to use dot1q or negotiate encapsulation and are in auto trunk mode. The system logging messages provide information about the formation of the 802.1Q trunk. Switch_A> (enable) set trunk 2/3 desirable dot1q Port(s) 2/3-6 trunk mode set to desirable. Port(s) 2/3-6 trunk type set to dot1q. Switch_A> (enable) %DTP-5-TRUNKPORTON:Port 2/3 has become dot1q trunk %DTP-5-TRUNKPORTON:Port 2/4 has become dot1q trunk %PAGP-5-PORTFROMSTP:Port 2/3 left bridge port 2/3-6 %DTP-5-TRUNKPORTON:Port 2/5 has become dot1q trunk %PAGP-5-PORTFROMSTP:Port 2/4 left bridge port 2/3-6 %PAGP-5-PORTFROMSTP:Port 2/5 left bridge port 2/3-6 %DTP-5-TRUNKPORTON:Port 2/6 has become dot1q trunk %PAGP-5-PORTFROMSTP:Port 2/6 left bridge port 2/3-6 %PAGP-5-PORTFROMSTP:Port 2/3 left bridge port 2/3 %PAGP-5-PORTTOSTP:Port 2/3 joined bridge port 2/3-6 %PAGP-5-PORTTOSTP:Port 2/4 joined bridge port 2/3-6 %PAGP-5-PORTTOSTP:Port 2/5 joined bridge port 2/3-6 %PAGP-5-PORTTOSTP:Port 2/6 joined bridge port 2/3-6 Switch_B> (enable) %DTP-5-TRUNKPORTON:Port 3/3 has become dot1q trunk %DTP-5-TRUNKPORTON:Port 3/4 has become dot1q trunk %PAGP-5-PORTFROMSTP:Port 3/3 left bridge port 3/3-6 %PAGP-5-PORTFROMSTP:Port 3/4 left bridge port 3/3-6 %PAGP-5-PORTFROMSTP:Port 3/5 left bridge port 3/3-6 %PAGP-5-PORTFROMSTP:Port 3/6 left bridge port 3/3-6 %DTP-5-TRUNKPORTON:Port 3/5 has become dot1q trunk %DTP-5-TRUNKPORTON:Port 3/6 has become dot1q trunk %PAGP-5-PORTFROMSTP:Port 3/5 left bridge port 3/3-6 %PAGP-5-PORTFROMSTP:Port 3/6 left bridge port 3/3-6 %PAGP-5-PORTTOSTP:Port 3/3 joined bridge port 3/3-6 %PAGP-5-PORTTOSTP:Port 3/4 joined bridge port 3/3-6 %PAGP-5-PORTTOSTP:Port 3/5 joined bridge port 3/3-6 %PAGP-5-PORTTOSTP:Port 3/6 joined bridge port 3/3-6 After the 802.1Q trunk link is negotiated, enter the show trunk command to verify the configuration. Switch_A> (enable) show trunk Port Mode Encapsulation 2/3 desirable dot1q 2/4 desirable dot1q 2/5 desirable dot1q 2/6 desirable dot1q Status -----------trunking trunking trunking trunking Native vlan ----------1 1 1 1 Port -------- 2/3 2/4 2/5 2/6 Vlans allowed on trunk 1-1005 1-1005 1-1005 1-1005 Port Vlans allowed and active in management domain 11-10 Software Configuration Guide-Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4 78-12647-02