Trunking a trunk link is able to carry traffic from

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Trunking A trunk link is able to carry traffic from more than one VLAN. Although the link can be 10Mbps the minimum recommended speed of the interface is 100Mbps. You can manually set the port to trunk (see below) or let Dynamic Trunking Protocol (DTP) do this. DTP port settings can be dynamic auto or dynamic desirable and the default settings vary per switch model. Settings which will result in a trunk forming are: Desirable Auto Desirable - Desirable 13
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Cisco CCENT Cram Guide v3.0 © Paul Browning 2017 www.in60days.com Desirable Trunk (manual) You can see the default or current settings with the show interface X switchport command. Manually disable DTP on the interface with: VLAN Trunking Protocol (VTP) VLAN Trunking Protocol (VTP) is a Cisco proprietary Layer 2 messaging protocol that manages the addition, deletion, and renaming of VLANs on switches in the same VTP domain. VTP allows VLAN information to propagate through the switched network, which reduces administration overhead in a switched network, whilst enabling switches to exchange and maintain consistent VLAN information. Switches are in server mode by default. In Server mode, the switch is authorized to create, modify, and delete VLAN information for the entire VTP domain. Any changes you make to a server are propagated throughout the whole domain. In Client mode, the switch will receive VTP information and apply any changes, but it does not allow adding, removing, or changing VLAN information on the switch. In Transparent mode, the switch will forward the VTP information received out of its trunk ports, but it will not apply the changes. Transparent mode is needed to configure the extended VLAN range (1006 to 4096). VTP Pruning Pruning prevents unnecessary VLAN information being sent over a trunk link if no interfaces are in the VLANs. Configured with the below command: 14 Switch(config)#vtp pruning Switch1(config-if)#switchport nonegotiate Switch#show int f0/2 switchport Name: Fa0/2 Switchport: Enabled Administrative Mode: dynamic auto Operational Mode: down Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: native Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Voice VLAN: none
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Cisco CCENT Cram Guide v3.0 © Paul Browning 2017 www.in60days.com Common Switching Commands This is not a sample config but a demonstration of commands you need to know. The switch must be in transparent mode to add higher numbered VLANs (1006-4096) i.e. extended VLANs. Sample configuration. Repeat commands on Switch1. 15 Switch1(config)#vlan 5 Switch1(config)#interface fast0/1 Switch1(config-if)#switchport mode access Switch1(config-if)#switchport access vlan 5 Switch1(config-if)#interface fast0/15 Switch1(config-if)#switchport mode trunk Switch(config)#vlan 2 creates VLAN 2 Switch(config-vlan)#name SALES names VLAN Switch(config)#interface fast 0/1 Switch(config-if)#switchport access vlan 2 puts interface into VLAN 2 Switch(config-if)#switchport mode trunk sets interface to trunk
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