LAG link down when adding interface to channel (Packet Tracer)

[Ergo0ne]

Hi everyone,

I'am experiencing some issues trying to add a new FastEthernet interface to a channel group already configured.

My configuration on both switches is simple :

• ACCESS on Vlan 10 or 20 for the PC 'Fa 0/3-4'
• Port-channel 
  • Trunk
  • Vlan allowed 10 & 20
• switch to switch IF 'Fa 01-3'configured with only 

  channel-group 1 mode active

• Channel group active links : Fa 01-2 (Fa 05 no wired)

interface Port-channel1
 switchport trunk allowed vlan 10,20
 switchport mode trunk
!
interface FastEthernet0/1
 channel-group 1 mode active
!
interface FastEthernet0/2
 channel-group 1 mode active
!
interface FastEthernet0/3
 switchport access vlan 10
!
interface FastEthernet0/4
 switchport access vlan 20
!
interface FastEthernet0/5
 channel-group 1 mode active
!

The issue is, when i connect the Fa 0/5 IF's between switches i have at least 4 packet losses between the PC's before the channel group IF get back to green is up again.

Is it an issue that is related to Packet Tracer or will i experience the same issue with physical cisco 2960 ? 

Please feel free if something has to be done to limite this delay or delete it !

Thank you.

[Jaderson Pessoa]

Dear, something doenst work properly on packet tracer, try make it using GNS3.

thanks in advance.

Mask as helpful or solved if it help you.