I was doing task 1.13 on the Bridging & Switching . I configured etherchannel with PagP between SW1 & SW2, SW1 & SW3 and SW1 & SW4. It's working fine but SW1 is not using PAgP as displayed in the show on the show etherchannel summary SW2, SW3 and SW4 are using PAgP. My configuration is correct. My question is this a normal behavior?