EtherChannel with Packet Tracer

[mostafasawy86]

I tried in Packet Tracer to bundle 4 links between 2 switches, each switch is connected to a host.

when I try to ping from host to other, it pings and successful, but when I try to disconnect a cable, which the selected link by the PAgP, it says Request timed out.

and it can't ping till I return that cable back again, what is the problem?

[Reza Sharifi]

Can you provide the configs from both switches?

[mostafasawy86]

on first switch:

Switch1>enable

Switch1#configure terminal

Switch1(config)#interface range f0/1-4

Switch1(config-if-range)#channel-protocol pagp

Switch1(config-if-range)#channel-group 1 mode auto

on second switch:

Switch2>enable

Switch2#configure terminal

Switch2(config)#interface range f0/1-4

Switch2(config-if-range)#channel-protocol pagp

Switch2(config-if-range)#channel-group 1 mode desirable

[Reza Sharifi]

What type of switches are these?

[mostafasawy86]

2950, I use packet tracer.

[benydan737]

Hello, i have packet tracer 6.2, and i use Switches 3560(L3), my portchannel have two ports, when i reload de Switch1, after to startup the Switch appear this message

%EC-5-CANNOT_BUNDLE2: Fa0/1 is not compatible with Po1 and will be suspended (trunk encap of Fa0/1 is auto Po1 is dot1q)

%EC-5-CANNOT_BUNDLE2: Fa0/2 is not compatible with Po1 and will be suspended (trunk encap of Fa0/2 is auto Po1 is dot1q)

Do you Know what is the problem

CONFIG S1

interface Port-channel 1

switchport trunk allowed vlan 10,20

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface FastEthernet0/1

channel-protocol pagp

channel-group 1 mode auto

switchport trunk allowed vlan 10,20

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface FastEthernet0/2

channel-protocol pagp

channel-group 1 mode auto

switchport trunk allowed vlan 10,20

switchport trunk encapsulation dot1q

switchport mode trunk

CONFIG S2

interface Port-channel 1

switchport trunk allowed vlan 10,20

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface FastEthernet0/1

channel-protocol pagp

channel-group 1 mode desirable

switchport trunk allowed vlan 10,20

switchport mode trunk

!

interface FastEthernet0/2

channel-protocol pagp

channel-group 1 mode desirable

switchport trunk allowed vlan 10,20

switchport mode trunk

Thanks

[glen.grant]

  On S2 define the trunk encapsulation on the interfaces themselves and then bounce the port-channel  .