LACP

Estou a tentar montar um cenário com o packet tracer 5.1, onde implemento o lacp entre dois switch's a configuração é a seguinte:

no primeiro switch:

version 12.1
no service password-encryption
!
hostname switchandar1
!
!
!
interface FastEthernet0/1
switchport access vlan 3
switchport mode access
spanning-tree portfast
!
interface FastEthernet1/1
switchport access vlan 2
switchport mode access
spanning-tree portfast
!
interface FastEthernet2/1
switchport access vlan 2
switchport mode access
spanning-tree portfast
!
interface FastEthernet3/1
!
interface FastEthernet4/1
channel-protocol lacp
channel-group 1 mode active
switchport mode trunk
!
interface FastEthernet5/1
channel-protocol lacp
channel-group 1 mode active
switchport mode trunk
!
interface Port-channel 1
!
interface Vlan1
no ip address
shutdown
!
interface Vlan2
ip address 10.20.1.2 255.255.255.0
!
ip default-gateway 10.20.1.254
!
line con 0
!
line vty 0 4
login
line vty 5 15
login
!
!
end

no segundo switch:

version 12.1
no service password-encryption
!
hostname switchandarR/C
!
!
!
interface FastEthernet0/1
switchport access vlan 3
switchport mode access
spanning-tree portfast
!
interface FastEthernet1/1
switchport access vlan 2
switchport mode access
spanning-tree portfast
!
interface FastEthernet2/1
!
interface FastEthernet3/1
!
interface FastEthernet4/1
channel-protocol lacp
channel-group 1 mode active
switchport mode trunk
!
interface FastEthernet5/1
channel-protocol lacp
channel-group 1 mode active
switchport mode trunk
!
interface Port-channel 1
!
interface Vlan1
no ip address
shutdown
!
interface Vlan2
ip address 10.20.1.1 255.255.255.0
!
ip default-gateway 10.21.1.254
!
line con 0
!
line vty 0 4
login
line vty 5 15
login
!
!
end

mas com esta configuração o lacp não está a funcionar como comprovo quando faço #show interfaces etherchannel pois dá-me o seguinte:

FastEthernet4/1:
Port state = 1
Channel group = 1 Mode = Active Gcchange = -
Port-channel = Po1 GC = - Pseudo port-channel = Po1
Port index = 0 Load = 0x00 Protocol = LACP
Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs
A - Device is in active mode. P - Device is in passive mode.
Local information:
LACP port Admin Oper Port Port
Port Flags State Priority Key Key Number State
Fa4/1 SA down 32768 0x0 0x0 0x5
Age of the port in the current state:
FastEthernet5/1:
Port state = 1
Channel group = 1 Mode = Active Gcchange = -
Port-channel = Po1 GC = - Pseudo port-channel = Po1
Port index = 0 Load = 0x00 Protocol = LACP
Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs
A - Device is in active mode. P - Device is in passive mode.
Local information:
LACP port Admin Oper Port Port
Port Flags State Priority Key Key Number State
Fa5/1 SA down 32768 0x0 0x0 0x6
Age of the port in the current state:
----
Port-channel1:Port-channel1 (Primary aggregator)
Age of the Port-channel =
Logical slot/port = Number of ports = 0
HotStandBy port = null
Port state =
Protocol = 1
Port security = Disabled

alguém me pode ajudar a mostrar-me o que estou a fazer de mal? o meu muito obrigado