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Are you in interface configuration mode? 
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Hi<br />
<br />
I have a 4507R-E switch and I am unable to set the encapsulation for a trunk port to 802.1Q. I have looked at the commands reference for the IOS version i have installed and it clearly states the command is as follows<br />
&nbsp;<b>switchport trunk encapsulation dot1q</b><i></i><br />
<br />
<a href="http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/54sg/command/reference/OL_22172.pdf" rel="ugc">http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/54sg/command/reference/OL_22172.pdf</a><br />
<br />
When i try the same command &nbsp;it does not work, in fact the only options i get are for the '<b>switchport trunk</b><i></i>' command are '<i><b>allowed, native and pruning</b></i>'<br />
<br />
I am running IOS version 12.2(54) <br />
<br />
What am i missing??<br />
<br />
Thanks<br />
<br />
<br />

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Hi

I have a 4507R-E switch and I am unable to set the encapsulation for a trunk port to 802.1Q. I have looked at the commands reference for the IOS version i have installed and it clearly states the command is as follows
 switchport trunk encapsulation dot1q

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/54sg/command/reference/OL_22172.pdf

When i try the same command  it does not work, in fact the only options i get are for the 'switchport trunk' command are 'allowed, native and pruning'

I am running IOS version 12.2(54) 

What am i missing??

Thanks




Unable to set encapsulation on Cisco 4507R switch

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.