l2ptguard error detected !!!!!

From: Adham Ali (adhamccie@yahoo.com)
Date: Sat Sep 01 2007 - 15:46:55 ART


Dear all,
   
  We need to create an Etherchannel between SW1 FE0/19 and FE0/20 to SW3 FE0/19 and FE0/20 using tunneling according to the below setup!
   
  SW1 (FE0/19) ---------- (FE0/13) SW4 (FE0/19)--------------- (FE0/19) SW3
  SW1 (FE0/21) ---------- (FE0/15) SW4 (FE0/21)--------------- (FE0/21) SW3
   
   
  In the same time we need to create a normal Dot1Q trunk between SW1-SW4 and SW4-SW3
   
  SW1 (FE0/20) ---------- (FE0/14) SW4
  SW4 (FE0/20)----------- (FE0/20) SW3
   
  So when i answer this question i receive "l2ptguard error detected " in SW4 and its interfaces change to "errdisable" state!!
   
  Did any body answered this question successfully?....do you know why i receive this error and what is missing or how can i fix it?.....
   
   
  Thank you in advance!
   
  Regards,
  Adham...
   

       
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