I'm using Packet Tracer for testing since I don't have the actual equipment. I have configured etherchannel between two 2960 Switches. I have used the trunk ports FE 0/23 and FE 0/24 on both switches to create the etherchanel. I have connected one PC with each switch. The PCs are in the same VLAN and can ping each other. Howver, when I take down one of the links in the etherchannel, the other link does not take over and I get 100% packet loss. I don't know what seems to be the problem. I'm quoting the configurations below:
Switch0:
Switch#sh running-config
Building configuration...
Current configuration : 1179 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Switch
!
!
spanning-tree mode pvst
!
!
! OUTPUT TRUNCATED !
!
!
interface FastEthernet0/23
channel-group 5 mode on
switchport mode trunk
!
interface FastEthernet0/24
channel-group 5 mode on
switchport mode trunk
!
interface GigabitEthernet1/1
!
interface GigabitEthernet1/2
!
interface Port-channel 5
switchport mode trunk
!
interface Vlan1
no ip address
shutdown
!
!
! OUTPUT TRUNCATED !
!
!
end
Switch#show interfaces trunk
Port Mode Encapsulation Status Native vlan
Fa0/23 on 802.1q trunking 1
Fa0/24 on 802.1q trunking 1
Po5 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/23 1-1005
Fa0/24 1-1005
Po5 1-1005
Port Vlans allowed and active in management domain
Fa0/23 1
Fa0/24 1
Po5 1
Port Vlans in spanning tree forwarding state and not pruned
Fa0/23 1
Fa0/24 1
Po5 1
Switch#show etherchannel summary
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+----------------------------------------------
5 Po5(SU) - Fa0/23(P) Fa0/24(P)
Switch 1:
Switch#sh running-config
Building configuration...
Current configuration : 1179 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Switch
!
!
spanning-tree mode pvst
!
!
! OUTPUT TRUNCATED !
!
interface FastEthernet0/23
channel-group 5 mode on
switchport mode trunk
!
interface FastEthernet0/24
channel-group 5 mode on
switchport mode trunk
!
interface GigabitEthernet1/1
!
interface GigabitEthernet1/2
!
interface Port-channel 5
switchport mode trunk
!
interface Vlan1
no ip address
shutdown
!
! OUTPUT TRUNCATED !
!
!
end
Switch#show interfaces trunk
Port Mode Encapsulation Status Native vlan
Fa0/23 on 802.1q trunking 1
Fa0/24 on 802.1q trunking 1
Po5 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/23 1-1005
Fa0/24 1-1005
Po5 1-1005
Port Vlans allowed and active in management domain
Fa0/23 1
Fa0/24 1
Po5 1
Port Vlans in spanning tree forwarding state and not pruned
Fa0/23 1
Fa0/24 1
Po5 1
Switch#show etherchannel summary
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+----------------------------------------------
5 Po5(SU) - Fa0/23(P) Fa0/24(P)
