12-05-2007 02:11 PM - edited 03-05-2019 07:50 PM
We have a 4510, we do not see or configure the "switchport trunk encapsulation" command on some ports. We have ports on the same blade configured with "switchport trunk encapsulation". But other ports we can't configure? Why is this?
Thanks,
Nick
12-05-2007 02:47 PM
Hi, you made have to set you port to layer 2 switching mode before you can configuer trunking. Try using the switchport command to change from layer 3 switching.
HTH
switchport
Use the switchport interface configuration command with no keywords on the switch stack or on a standalone switch to put an interface that is in Layer 3 mode into Layer 2 mode for Layer 2 configuration. Use the no form of this command to put an interface in Layer 3 mode.
switchport
no switchport
Use the no switchport command (without parameters) to set the interface to the routed-interface status and to erase all Layer 2 configurations. You must use this command before assigning an IP address to a routed port.
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Note If an interface is configured as a Layer 3 interface, you must first enter this switchport command with no keywords to configure the interface as a Layer 2 port. Then you can enter additional switchport commands with keywords, as shown on the pages that follow.
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.1/12ew/configuration/guide/layer2.html
12-05-2007 04:56 PM
Yes, I've seen that before. Only x amount of ports allows you to configure dot1q or isl while the remaining ports only allow dot1q trunking, hence you don't need to command.
If you post the module number, I can look it up and point you to the problem description.
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