9.1 Trunking  
  9.1.5 Trunking implementation  
To create or configure a VLAN trunk on a Cisco IOS command-based switch, configure the port first as a trunk and then specify the trunk encapsulation with the following commands:

Before attempting to configure a VLAN trunk on a port, determine what encapsulation the port can support. This can be done using the show port capabilities command. In the example, notice in the highlighted text that Port 2/1 will support only the IEEE 802.1Q encapsulation.

Verify that trunking has been configured and verify the settings by using the show trunk [mod_num/port_num] command from privileged mode on the switch.

Figure shows the trunking modes available in Fast Ethernet and Gigabit Ethernet.

 

Lab Activity

Lab Exercise: Trunking with ISL

This lab is to create an ISL trunk line between the two switches to allow communication between paired VLANs.

   

 

Lab Activity

Lab Exercise: Trunking with 802.1q

This lab is to create an 802.1q trunk line between the two switches to allow communication between paired VLANs.

   
 

Lab Activity

e-Lab Activity: Trunking with ISL

In this lab, the student will create multiple VLANs on two separate switches, name the switches, and assign multiple member ports to the switches.

   
 

Lab Activity

e-Lab Activity: Trunking with 802.1q

In this lab, the student will create multiple VLANs on two separate switches, name the switches, and assign multiple member ports to the switches.

   
 

Web Links

Understanding and Configuring VLAN Trunk Protocol (VTP)

http://www.cisco.com/en/US/tech/ tk389/tk689/ technologies_tech_ note09186a0080094c52.shtml