Etherchannel Port Members

[BilalButt62333]

I was practicing on the L3 switch in packet tracer just for test I shutdown on the port it was ok everything but when I "no shutdown" on that port all members was restarting  and also have downtime for some seconds as pics below, So any way for better performance to avoid this downtime

Switch1:

interface Port-channel1

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface GigabitEthernet0/1

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 1 mode active

!

interface GigabitEthernet0/2

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 1 mode active

!

Switch2:

!

interface Port-channel1

switchport trunk encapsulation dot1q

switchport mode trunk

!

!

interface GigabitEthernet0/1

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 1 mode active

!

interface GigabitEthernet0/2

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 1 mode active

!

[balaji.bandi]

Looks like the Limitation i see in PT, But in real world you would not see the issue. 

what kind of spanning tree config here ?

i would you to try : and test it.

spanning-tree mode rapid-pvst

or

spanning-tree mode rstp

also worth try :

switchport nonegotiate

[BilalButt62333]

I didn't config any the default global one already config pvst , is it ok?

[Martin L]

PT is just a sim; not real thing but make sure you run Rapid STP (spanning-tree mode rapid-pvst) on all switches. instead of default STP. Note: if you have more switches and more port channels, PT may go "crazy" trying to establish layer 2 network (STP).  Making any changes on switches with etherchannels, just save and reload switches one by one.   just keep this in mind. 

Regards, ML
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