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Setting up a trunk on a 2960 is the same as most of Cisco s IOS switches:
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switch(config)# interface type slot_#/port_# switch(config-if)# switchport mode trunk|dynamic desirable| dynamic auto|nonegotiate switch(config-if)# switchport trunk native vlan VLAN_#
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All ports on a 2960 switch support trunking Remember that the 2960 supports only 8021Q trunking, so you must set up a trunk connection only to other 8021Q trunking devices If you want a trunk to be in an on state, use the trunk parameter For a desirable DTP state, use dynamic desirable, and for an auto state, use dynamic auto The default mode is auto If you don t want to use DTP but still want to perform trunking, use the nonegotiate parameter For 8021Q trunks, the native VLAN is VLAN 1 You can change Use the switchport this with the switchport trunk native mode command to enable trunking on vlan command, but then you ll need to match a switch up the native VLAN on all switches in the layer 2 network After you have configured your trunk connection, you can use this command to verify it:
switch# show interfaces type 0/port_# switchport|trunk
Here s an example using the switchport parameter:
switch# show interface fastEthernet0/1 switchport Name: Fa0/1 Switchport: Enabled Administrative mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: Disabled Access Mode VLAN: 0 ((Inactive)) Trunking Native Mode VLAN: 1 (default) Trunking VLANs Enabled: ALL Trunking VLANs Active: 1,2 Pruning VLANs Enabled: 2-1001 Priority for untagged frames: 0 Override vlan tag priority: FALSE Voice VLAN: none
In this example, FA0/1 s trunking mode is set to trunk (on), with the native VLAN set to 1 Here s an example using the trunk parameter:
switch# Port Fa0/1 Port show interfaces trunk Mode Encapsulation on 8021q Vlans allowed on trunk Status trunking Native vlan 1
13: VLANs and Trunks
Fa0/1 Port Fa0/1 Port Fa0/1
1-4094 Vlans allowed and active in management domain 1-2 Vlans in spanning tree forwarding state and not pruned 1-2
Use the show interfaces switchport|trunk command to verify trunking
In this example, one interface is trunking fa0/1: the trunking mode is on, the trunking protocol is 8021Q, and the native VLAN is 1
CertCam ON THE CD
1302 The CD contains a multimedia demonstration of configuring trunking on a switch
EXERCISE 13-1 Configuring Trunks on Your Switches
ON THE CD
The last few sections dealt with setting up trunks on Cisco switches You ll perform this lab using Boson s NetSim simulator This exercise has you set up a trunk link between the two 2950 switches (2950-1 and 2950-2) You can find a picture of the network diagram for the NetSim simulator in the Introduction of this book After starting up the simulator, click the Lab Navigator button Next, double-click Exercise 13-1 and click the Load Lab button This will load the lab configuration based on the exercises in s 11 and 12 1 On the 2950-1 switch, set the trunk mode to trunk for the connection between the two 2950 switches and examine the status Does the trunk come up At the top of the simulator in the menu bar, click the eSwitches icon and choose 2950-1 Access Configuration mode: enable and configure terminal Go into the interface: interface fa0/1 Set the trunk mode to trunk: switchport mode trunk Exit Configuration mode: end Use the show interfaces trunk command to verify the status
VLAN Con guration
You might have to wait a few seconds, but the trunk should come up If one side is set to on, or desirable, and the other is set to on, desirable, or auto (default), then the trunk should come up 2 Save the configuration on the switch: copy running-config startup-config 3 On the 2950-2 switch, set the trunk mode to trunk for the connection between the two 2950 switches and verify the trunking status of the interface At the top of the simulator in the menu bar, click the eSwitches icon and choose 2950-2 Access Configuration mode: enable and configure terminal Go into the interface: interface fa0/1 Set the trunk mode to trunk: switchport mode trunk Exit Configuration mode: end Use the show interfaces trunk command to verify the status 4 Save the configuration on the switch: copy running-config startup-config Now you should be more comfortable with setting up trunks on your switches In the next section, you will be presented with setting up VLANs and associating interfaces to your VLANs
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