Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Cisco 3750g Stack - to - Xtrem 3804 trunk config

Posted on 2008-10-01
8
877 Views
Last Modified: 2012-05-05
Have an existing 2960G Cisco switch that the VLAN1 interface is setup with an IP and the next line is the trunk command:
switchport mode trunk
There is no Dot1Q encapsulation for this interface on the existing 2960 when I look at the config and it works fine.  When I try to do this on a new 3750G stack I get the following error:

Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode.

I have seen where I may need to add the dot1q encap but want to make sure especially since I am connecting to an older Extreme 3804 Switch and it either did not have to be done on the existing 2960G or is it possibly transparent to me?  Any help much appreciated.
0
Comment
Question by:TTNSTC
  • 3
  • 2
  • 2
  • +1
8 Comments
 
LVL 50

Assisted Solution

by:Don Johnston
Don Johnston earned 45 total points
ID: 22618150
2950's and 2960's support 802.1q trunking only. The "switchport trunk encapsulation" command is not recognized since there's only one trunking protocol.


0
 
LVL 26

Accepted Solution

by:
Soulja earned 30 total points
ID: 22618706
The reason you get that error on the 3750 is because you have to enter the switchport encapsulation dot1q command first then the switchport mode trunk command.
0
 
LVL 26

Expert Comment

by:Soulja
ID: 22618719
Correction switchport trunk encapsulation command.
0
Easy, flexible multimedia distribution & control

Coming soon!  Ideal for large-scale A/V applications, ATEN's VM3200 Modular Matrix Switch is an all-in-one solution that simplifies video wall integration. Easily customize display layouts to see what you want, how you want it in 4k.

 
LVL 50

Assisted Solution

by:Don Johnston
Don Johnston earned 45 total points
ID: 22619362
The "switchport trunk encapsulation" cannot be used on a switch that supports only one trunking protocol.
0
 
LVL 26

Expert Comment

by:Soulja
ID: 22620140
I am referring to the 3750 switches, not the 2960.
0
 
LVL 13

Expert Comment

by:kdearing
ID: 22620295
Make sure you use dot1q trunking and not Cisco's old ISL, it is proprietary
Dot1q is the standard to be used between devices from different manufacturers.
0
 

Author Closing Comment

by:TTNSTC
ID: 31502086
Thanks guys.  The 3750 came up by default and recognized the dot1q protocol and adapted.  I was just a little confused because this had to be hard coded on the 2960 about a year ago to work.  Because of your responses I have a better understanding and everything is good.  Thanks again.
0
 

Author Comment

by:TTNSTC
ID: 22620705
Thanks everyone
0

Featured Post

Connect further...control easier

With the ATEN CE624, you can now enjoy a high-quality visual experience powered by HDBaseT technology and the convenience of a single Cat6 cable to transmit uncompressed video with zero latency and multi-streaming for dual-view applications where remote access is required.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Redesigning network for lab and gaming, cisco switch, pfsense router 9 153
HSRP needed? 4 57
2960 and a VLAN id of 1237 2 66
Auto Smartport macro for Dell and HP laptops 2 81
This tutorial will go through the steps required to write a script that will back up the configuration settings of a HP-ProCurve switch. You will need to get the following things to follow this tutorial: Telnet Scripting Tool e.g. TST10.exe …
I eventually solved a perplexing problem setting up telnet for a new switch.  I installed a new Cisco WS-03560X-24P switch connected to an existing Cisco 4506 running a WS-X4013-10GE Sup II-Plus. After configuring vlans and trunking,  I could no…
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question