Example 113 Configuring an ISL Trunk

3550_switch(config)#interface gigabitEthernet 0/1 3550_switch(config-if)#switchport trunk encapsulation dotlq

3550_switch(config-if)#switchport mode trunk

To verify whether the trunk is working, be sure to status both sides of the link. The output of the si interface_nameswitchport command and the output of the show interfacefnterface_nametrunk > present a general status of the trunk. The information presented here is very similar to the show t command on the Catalyst 4000/5500/6500 series switches.

This command shows the status of the trunk and the encapsulation. dLAN information, such as the the active dLANs on the links, and any prune-eligible dLANs, will also be listed. Furthermore, prote and voice dLANs are listed with this command. Example 1-14 lists the output of the show interfac interface_name switehport command. If the trunk is not listed, some configuration areas to note following:

• Encapsulation e Native VLANs for-802.1Q trunks

Set the status of the trunk to be trunking and the mode to be on, or match a valid setting for DTP ; previously. The encapsulation must match on both sides of the trunk. The native VLAN ID is the VL use for its single instance of spanning tree (MST). This VLAN must be the same throughout the VTF

0 0

Post a comment